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Krell Industries EVOLUTION TWO MONAURAL PREAMPLIFIER User's Manual

1. Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode B 1 Use the level control knob or the up and down keys to select the desired input B 1 B 2 B 3 S 1 S 2 S 3 S 4 C 1 C 2 C 3 or TAPE Press the enter button or key The front panel display shows no characters Use the level control knob or the up and down keys to select the desired input name from the input name options listed at left Press the enter button or key to confirm the selection and return to the input list in Step 3 The front panel display shows the input name To select input names for other inputs repeat Steps 3 and 4 Input Phase This function enables you to invert the absolute polarity of the selected input 180 degrees The selections are NORMAL INVERT Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or the up and down keys 16 on the remote control to select INPUT PHASE 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode B 1 3 Use the level control knob or the up and down keys to select the desired input from the list B 1 B 2 B 3 S 1 S 2 S 3 S 4 C 1 C 2 C 3 or TAPE 4 Press the enter button or key The front panel display shows the default mode NORMAL
2. 5 Use the level control knob or the up and down keys to select NORMAL Or INVERT 6 Press the enter button or key to confirm the selection The front panel display shows the selected input NORMAL The phase of the selected input is unaffected INVERT The phase of the selected input is inverted 180 degrees Input Trigger 17 Menu Button or Key Enter or exit the menu 16 Volume Knob or Level Keys Navigate the menu hierarchy review functions and configu ration options 18 Enter Button or Key Select a configuration option or confirm a selection BACK Scroll up the menu hierarchy or exit a menu option without confirming it This function enables you to configure the input trigger The options are OFF NORMAL THEATER Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or the up and down keys on the remote control to select INPUT TRIGGER 2 Press the enter button on the preamplifier chassis front panel or the or enter key 18 on the remote control The front panel display 15 shows the default mode NORMAL 3 Use the level control knob or the up and down keys to select the desired option OFF NORMAL Or THEATER 4 Press the enter button or key to confirm the selection The front panel display reads INPUT TRIGGER continued SECTION SEVEN Customizing the Evolution Two continued Input Trigger continued OFF The Evolution Two does not respond to 12 V
3. O 0 0 0 i QOG 10 O 00O TI 22 Oo BAL MENU ENTER 18 O 7 Q 17 16 O Q 23 PAUSE STOP PLAY 24 O O 95 K D lt I gt gt O O O Power 3 Power Key 26 27 Preamplifier 8 Single ended Input Functions Selection Keys 9 Balanced Input VOOLUFICGN Selection Keys 10 CAST Input Selection Keys 11 Tape Key H lt iReLk 12 Mute Key 13 Record Key 14 Phase Key Pe eee 21 Main Bus Key 22 Balance Key Level 16 Level Keys Navigate 17 Menu Key Customize 418 Enter Key CD 23 Pause Key Functions 24 Play Key 25 Stop Key 26 Track Forward and Back Key 27 Search Forward and Back Key Amplifier 28 Amplifier Power Key Functions 29 Meter Select Key Front Panel Description See Figure 1 on page 15 Each Evolution Two Monaural Preamplifier channel is comprised of two chas sis the preamplifier chassis and the power supply chassis Front panel func tions and their descriptions follow Chassis 1 Preamplifier Chassis The preamplifier chassis front panel provides power on input and zone selec tion level control menu functions and status display 2 Power Supply Chassis Powerful transformers high quality regulators and extensive electrical and magnetic shielding are housed in a separate power supply for each preampli fier channel Power 3 Power Button or Key Use this button or key to switch the Evolution Two between the stand by and operational modes 4 Stand by LED The red stand by LEDs on the preamplifier and the p
4. 1 has an RS 232 port that receives messages from a computer based control system providing integrated control of all preamplifier functions The RS 232 input uses a 9 pin D subminiature connector See the Evolution Two developer s reference entitled RS 232 Port Sending Commands and Interpreting Data for more information 12 VDC In Out 12 V Trigger Each Evolution Two preamplifier chassis 1 has 2 outputs that send and one input that receives 12 VDC power on off 12 V trigger signals to and from other Krell components and other devices that incorporate a 12 V trigger This allows you to turn other components on or off or to and from stand by through the remote control When the Evolution Two is switched to operational mode and is connected to other components through the 12 V trigger it sends a signal that will switch other components allowing whole systems or parts of systems to be easily coordinated For more information on customizing the 12 V trigger see Input Trigger on page 39 Mono 1 8 mini connectors are used in the following configuration Tip 12 V Sleeve GND Notes When the Evolution Two is in the operational mode the 12 V trigger provides 12 Volts of DC output When the component is in the stand by mode or off the DC output is 0 Volts A minimum of 30 mA is required to operate the 12 V trigger Consult the owner s reference of the components used in a custom installation to take full advantage of the
5. S VID TAPE1 TAPE2 TAPES TAPE TEST THR TUNER TUNR1 TUNR2 TV VCR VCR1 VCR2 VCR3 VDISC VIDEO VID1 VID2 VID3 8MM 8TRK SECTION SEVEN Customizing the Evolution Two continued Input Level Trim This function enables you to select an input offset for a particular input The options are 6 dB in 1 dB increments Enter the menu then 1 2 Use the level control knob on the preamplifier chassis front panel or the up and down keys 16 on the remote control to select INPUT LEVEL TRIM Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode B 1 Use the level control knob or the up and down keys to select the desired input B 1 B 2 B 3 S 1 S 2 S 3 S 4 C 1 C 2 C 3 or TAPE Press the enter button or key The front panel display shows the default mode 0 dB Use the level control knob or the up and down keys to select the desired trim option 6 dB in 1 dB increments Press the enter button or key to confirm the selection The front panel display shows the selected input Input Name This function enables you to select an input name for each input The input name options are listed in the left margin on this page Enter the menu then 1 2 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select INPUT NAME
6. delivers near perfection in the audible band that typi cally suffers from phase distortions in voltage circuits CAST Cable Construction A CAST system uses cables manufactured by Krell and other manufacturers spe cially licensed by Krell Thin and flexible CAST cables are constructed with the same build quality as other Krell components and are aesthetically matched to the components that Krell manufactures An all metal body and locking connectors with gold contacts are part of the standard no compromise specification devel oped for every CAST cable made Evolution CAST By employing radical current mirror circuitry the Evolution components elevate the CAST technology to another level This advanced use of the technology increases the linearity transient speed and bandwidth of the Evolution components while reducing the distortion by an order of magnitude The Best Musical Performance When you operate a CAST system you will hear significant improvements in every performance area speed precision dynamic range depth and width of the sound stage transient impact tonal balance harmonic distortion and more The goal for CAST is the same company goal used for all Krell products Krell strives for the delivery of the best performance of a musical event for you using the full expres sion of technology to date O continued SECTION ONE About Krell continued Ensuring Maximum Performance My pursuit of excellence in
7. or 2 and the delayed for a period of time 0 20 seconds RC 5 Control This function enables you to change the link transmit status of the Evolution Two The options are LINK TRANSMIT LINK RECEIVE Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select RC 5 CONTROL 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode LINK TRANSMIT 3 Use the level control knob or the up and down keys to select the desired option LINK TRANSMIT Or LINK RECEIVE 4 Press the enter button or key to confirm the selection The front panel display reads RC 5 CONTROL The right terminated preamplifier channel is the link transmitter of RC 5 data Connect the RC 5 cable to the RC 5 connector on the right terminated preampli fier channel For more information on linked preamplifier channels see Appendix CAN Link and Multiple Evolution Two Preamplifiers on page 51 continued SECTION SEVEN Customizing the Evolution Two continued Recall This function enables you to access factory default settings or your own saved settings or to undo a clone The options are FACTORY SAVED CLONE UNDO Enter the menu then 1 Use the level control knob on the preamplifier channel front panel or up and down keys 16 on the remote control to
8. select RECALL 2 Press the enter button on the preamplifier channel front panel or the or enter key 18 on the remote control The front panel display 15 shows the default mode FACTORY 3 Use the level control knob or the up and down keys to select the desired option FACTORY SAVED Or CLONE UNDO 4 Press the enter button or key to confirm the selection The front panel display reads RECALL FACTORY Recalls the factory settings SAVED Recalls settings previously stored in memory using the save function See also Save on page 45 CLONE UNDO Cancels clone settings All settings revert to the last settings in memory prior to cloning See also Clone on page 35 RS 232 Control 17 Menu Button or Key Enter or exit the menu 16 Volume Knob or Level Keys Navigate the menu hierarchy review functions and configu ration options 18 Enter Button or Key Select a configuration option or confirm a selection BACK Scroll up the menu hierarchy or exit a menu option without confirming it This function enables you to change the link transmit status of the Evolution Two The options are LINK TRANSMIT LINK RECEIVE Enter the menu then 1 Use the level control knob on the preamplifier channel front panel or up and down keys 16 on the remote control to select RS 232 CONTROL 2 Press the enter button on the preamplifier channel front panel or the enter key 18 on the remote control The front panel display 15
9. sound reproduction and my love of great musical performance fuels the ongoing Evolution design effort at Krell Dan D Agostino The product of breakthrough Krell technology the Evolution Two Monaural Preamplifier works in tandem with the Evolution One Monaural Power Amplifier to provide a sound that is supremely dynamic and musical Indeed it is the sound of the music itself Core Technologies Zero Feedback Balanced Current Mode Design The signal path is fully complementary and fully balanced from input to output All transistors operate in Class A mode CAST inputs drive a newly designed current mode balanced input stage which uses a unique topology able to reject com mon mode input noise over an unusually wide bandwidth Single ended and balanced inputs drive a dynamically cascoded JFET buffer which has tremendous open loop linearity and very high input impedance to elim inate loading effects The voltage signals are then converted into balanced current signals the form in which they remain through the remainder of the signal path The audio signal remains in the current domain throughout the entire preamplifier Only at the single ended and voltage outputs is it converted back to the voltage domain All signal gain is realized in the current domain using proprietary multiple output current mirrors with nearly 500 times the open loop linearity of other designs Negative feedback is not used anywhere in the Evolution Two pream
10. the Evolution Two Volume adjustments are then made through the preamp processor connect ed to the input configured for theater mode on the Evolution Two The options are ON OFF Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or the up and down keys 16 on the remote control to select THEATER 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default input B 1 3 Use the level control knob or the up and down keys to select the desired input B 1 B 2 B 3 S 1 S 2 S 3 S 4 C 1 C 2 C 3 OF TAPE 4 Press the enter button or key The front panel display shows the default mode OFF 5 Use the level control knob or the up or down keys to select ON or OFF 6 Press ENTER to confirm the selection and return to the selected input ON The selected input is set to THEATER and the volume control for the theater input is disengaged on the Evolution Two OFF The selected input is configured normally and the volume control for the normal input is engaged on the Evolution Two Note Only one input on the Evolution Two can be in theater mode at a time When theater mode is set for an input theater mode is cleared automatically from other inputs The Evolution Two selects the theater input automatically upon power on if the input trig ger is configured for THEATER See Input Trigger on p
11. the remote control The red record LED illuminates on the preampli fier chassis front panel Press the input selection button or keys to select the source that you want to record through the record bus output This source can be different than the source selected for the main bus outputs in Step 2 Press the record button or the main key 21 on the remote control to return to the main bus output Operation Using CAN Link When a system with linked Evolution Two preamplifier channels is powered on left right orientation is established immediately with no user intervention 1 The input selections and the power volume balance phase record and mute adjustments you make on any preamplifier channel are instantly transmitted between all linked preamplifier channels 2 All configuration settings may be copied from any linked preamplifier channel to all other linked preamplifier channels using the clone feature See Clone on page 35 For more information on linked preamplifiers see Appendix CAN Link and Multiple Evolution Two Preamplifiers on page 51 soo DE VEN Customizing the Evolution Two The Evolution Two Monaural Preamplifier easy to use menu allows you to config ure the following functions You can also use the menu to review version informa tion about the software hardware and firmware installed in the Evolution Two AC Mains page 33 Input Name page 38 Recall page 44 Backlight page 33 Input Phas
12. then 1 Identify the clone transmitter and clone receiver The clone transmitter is the preamplifier channel that transmits the clone and the clone receiver s is are the preamplifier channel s that receive s the clone 2 Use the level control knob on the preamplifier chassis front panel of the clone transmitter or up and down keys 16 on the remote control to select SOFTWARE CLONE 3 Press the enter button on the clone transmitter front panel or the enter key 18 on the remote control The front panel display 15 reads SW BEGIN O continued SECTION SEVEN Customizing the Evolution Two continued Software Clone continued 4 Press the enter button or the enter key 18 again The front panel display on the clone transmitter shows the default ARE YOU SURE NO 5 Use the level control knob on the clone transmitter or the up and down keys to select ARE YOU SURE YES 6 Press the enter button on the clone transmitter The front panel display on the clone transmitter reads SENDING UPDATE The front panel display on the clone receiver s read s RECEIVING UPDATE All linked preamplifier channels switch to stand by mode indicating that the software clone is accomplished SW CLONE BEGIN Begins the software clone process ARE YOU SURE Confirms the software clone The options are NO YES NO Cancels the software clone The front panel display returns to SOFTWARE CLONE YES Initiates the software clone Tap
13. will expose the real advantages of the latest recording formats while taking compact disc playback to the next level encourage you to audition it as soon as it is released Sincerely Daniel D Agostino Chief Executive Officer scono ONE About Krell This section describes the Krell Legacy the innovative features and technology of the Evolution Two and defines CAST and other key terms used in this reference The Krell Legacy I design every Krell component to set the standard for workmanship style and performance Dan D Agostino High end audio is a demanding pursuit an ongoing quest for excellence in music reproduction that drives equipment manufacturers to strive for the absolute in design and performance With a keen understanding of this passionate drive Krell Industries Inc was founded in 1980 Over the past 2 1 2 decades Krell has earned a distinguished reputation for engi neering innovation and product excellence The company s history is replete with product introductions that have deeply impacted the high end audio industry The most discriminating audiophiles and product reviewers have consistently recog nized Krell components for standard setting performance From the company s inception to the present Krell C E O Dan D Agostino has continually pushed the envelope of performance in audio His exploration of new technologies driven by his never ending quest to elevate the stan
14. 1 mA RMS Balanced 9 V RMS Single ended 18 V RMS Output overload CAST 22 mA RMS Balanced 20 V RMS Single ended 10 V RMS Frequency response 20 Hz to 20 kHz 0 01 dB Balanced or single ended inputs 0 2 Hz to 1 3 MHz 0 3 dB CAST inputs 0 2 Hz to 2 MHz 0 3 dB Total harmonic distortion plus noise Balanced Output lt 0 003 20 Hz to 20 kHz 4 V RMS CAST output 4 mA RMS Signal to noise ratio 4 V RMS balanced or 4 mA RMS CAST output Wideband unweighted gt 97 dB A weighted gt 104 dB Power consumption Standby 50 W Power on 80 W Power on with KPE 90 W Dimensions Preamplifier only 17 3 in W x 3 7 in H x 18 5 in D 43 8 cm W x 9 5 cm H x 47 cm D Power supply only 17 3 in W x 3 7 in H x 17 3 in D 43 8 cm W x 9 5 cm H x 43 8 cm D Preamplifier channel 17 3 in W x 7 3 in H x 18 5 in D 43 8 cm W x 18 5 cm H x 47 cm D Stereo pair 17 3 in W x 14 6 in H x 18 5 in D 43 8 cm W x 37 1 cm H x 47 cm D Weight Shipped 69 Ibs 31 2 kg Preamplifier only 21 Ibs 9 5 kg Power supply only 31 Ibs 14 kg
15. EVOLUTION EVOLUTION TWO MONAURAL PREAMPLIFIER OWNER S REFERENCE Evolution Two Monaural Preamplifier Owner s Reference v05 0 Krell Industries Inc 45 Connair Road Orange CT 06477 3650 USA TEL 203 799 9954 FAX 203 891 2028 E MAIL Krell krellonline com WEBSITE http Awww krellonline com cE This product complies with the EMC directive 89 336 EEC and the low voltage directive 73 23 EEC WARNINGS The Evolution Two preamplifier must be placed on a firm level surface where it is not exposed to dripping or splashing The ventilation grids on the top of the Evolution Two preamplifier and the space underneath the Evolution Two preamplifier must be unobstructed at all times during operation Do not place flam mable material above or beneath the preamplifier Before making connections to the Evolution Two preamplifier ensure that the power is off and other components are in mute or stand by mode Make sure all cable terminations are of the highest quali ty free from frayed ends short circuits or cold solder joints Do not connect an RS 232 cable to the phono power port Output from the phono power port can seriously damage your computer Do not connect the cable from a Krell KPE phono stage to the RS 232 port THERE ARE NO USER SERVICEABLE PARTS INSIDE AN EVOLUTION TWO MONAURAL PREAMPLIFIER Please contact Krell if you have questions not addressed in this guide This product is manufactured in the Uni
16. HT Questions and Answers page 49 Troubleshooting System Noise APPENDIX CAN Link and Multiple Evolution Two Preamplifiers page 51 WARRANTY page 53 RETURN AUTHORIZATION PROCEDURE page 55 SPECIFICATIONS page 56 List of Illustrations Figure 1 page 15 Evolution Two Preamplifier Chassis and Power Supply Chassis Front Panels Inset Evolution Two Preamplifier Channel Front Panel View Figure 2 page 16 Evolution Two Remote Control Figure 3 page 22 Evolution Two Preamplifier Chassis and Power Supply Chassis Back Panels A Letter from Dan D Agostino Dear Audio Enthusiast Thank you for your purchase of the Evolution Two preamplifier My new Evolution products represent a watershed in my design philosophy and in my quest for audio components that deliver absolute truth in music reproduction The expanse of the Evolution Two monaural design has allowed me to explore fully the advantages of current mode topologies The resulting circuit utilizes no feedback and has a bandwidth of 2 MHz have always been fascinated by the artistry inherent in great musical performanc es and my new Evolution Two preamplifier delivers the these performances in their entirety unaltered to the amplifier At the same time the Evolution Two pre amplifier provides the flexibility and control necessary for the listener to thoroughly enjoy a high performance audio system It is my pleasure to make the Evolution products available to
17. RECEIVE 5 Press the enter button on the front panel of the clone transmitter All clone receivers go into stand by mode indicating that the clone is accomplished Note The enter button on the remote contro cannot be used to activate the clone function continued SECTION SEVEN Customizing the Evolution Two continued CLONE BEGIN Sends the message that a clone is about to begin from the clone transmitter to the clone receiver s CLONE TRANSMIT Once the clone begin message is sent the clone transmitter display reads CLONE TRANSMIT indicating that the preamplifier is ready to transmit the clone data CLONE RECEIVE Once the clone begin message is sent the clone receiver s display reads CLONE RECEIVE indicating that the preamplifier s is are ready to receive the clone data Note In order to set a clone receiver to ignore the clone use the level control knob on the clone receiver front panel to scroll to CLONE IGNORE Display 17 Menu Button or Key Enter or exit the menu 16 Volume Knob or Level Keys Navigate the menu hierarchy review functions and configu ration options 18 Enter Button or Key Select a configuration option or confirm a selection BACK Scroll up the menu hierarchy or exit a menu option without confirming it This function enables you to turn on the front panel display 15 all the time or turn it off after a time out The options are ON TIMED Enter the menu then 1
18. Use the level control knob on the preamplifier chassis front panel or the up and down keys on the remote control 16 to select DISPLAY 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 reads MODE 3 Press the enter button or key 18 again The front panel display shows the default mode ON 4 Use the level control knob or the up and down keys to select the desired option ON or TIMED 5 Press the enter button or key to confirm the selection The front panel display reads MODE 6 Use the level control knob or the up and down keys to select BRIGHTNESS 7 Press the enter button or key The front panel display shows the default mode HIGH 8 Use the level control knob or the up and down keys to select the desired brightness OFF LOW 25 MED 50 Or HIGH 100 9 Press the enter button or key to confirm the selection The front panel display reads BRIGHTNESS Info PC Boards CAST IN 1 CAST IN 2 CAST IN 3 CONNECT CONTROL DISPLAY DISPLAY VERSION ENCODER FACEPLATE MAIN OUT 1 OUT 2 REGULATOR TAPE OUT 1 TAPE OUT 2 VOLT IN VOLUME ON The front panel display is always on TIMED The front panel display times out after 5 seconds BRIGHTNESS Controls the brightness of the display When the brightness setting is OFF the display is at 50 of brightness when in menu mode and turns completely off when you le
19. ages 39 40 continued SECTION SEVEN Customizing the Evolution Two continued Volume Display 17 Menu Button or Key Enter or exit the menu 16 Volume Knob or Level Keys Navigate the menu hierarchy review functions and configu ration options 18 Enter Button or Key Select a configuration option or confirm a selection BACK Scroll up the menu hierarchy or exit a menu option without confirming it This function enables you to select the numeric mode for the volume display dis playing values from softest to loudest O to 151 Alternatively you can select the dB mode for the volume display displaying values from softest to loudest inf to 12 dB The options are NUMERIC dB Enter the menu then 1 2 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select VOLUME DISPLAY Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode dB Use the level control knob or the up and down keys to select the desired option NUMERIC or DB Press the enter button or key to confirm the selection The front panel display reads VOLUME DISPLAY scorn EIGHT Questions and Answers Q A O Why does the second preamplifier channel not respond when select an input or adjust the volume on the other preamplifier channel The t
20. amplifier chassis with the 12 pin DC cable provided using the DC power connectors 47 on the back panels 1 2 IMPORTANT Never connect two power supplies together In order to operate the Evolution Two preamplifier in linked mode connect the preamplifier channels together with the supplied RJ 45 control cable In linked mode functions including power volume balance phase record mute and input selections are instantaneously transmitted between linked preamplifier channels When a system with linked preamplifier channels is powered on left right ori entation is established immediately with no user intervention For more infor mation on linked preamplifiers see Appendix CAN Link and Multiple Evolution Two Preamplifiers on page 51 Neatly arrange and organize wiring to and from the Evolution Two preamplifier and all components Separate AC wires from audio cables to prevent hum or other unwanted noise from being introduced into the system Connect the outputs of your source equipment to the appropriate CAST 34 balanced 30 single ended 31 or tape inputs 32 33 on the Evolution Two Connect the appropriate main outputs 35 41 on the Evolution Two to your amplifier continued SECTION THREE Quick Start Connecting the Evolution Two To Your System continued 6 7 On each preamplifier channel connect the supplied AC power cord to the IEC power cord receptacle 48 On each preamplifier chan
21. ansistors A dedicated 90 VA toroidal transformer with three independent secondary wind ings powers the preamplifier s digital control circuitry The regulators for the con amp continued SECTION ONE About Krell continued Separate Power Supply continued trol circuitry team ultra stable voltage reference chips with the same discrete high current driver and output transistors used in the main analog regulators These ample power reserves are brought to the Evolution Two via high reliability 12 pin connectors with machined gold plated three amp contacts Secondary voltage regulators for each analog stage in the Evolution Two provide ultra quiet rock solid supply rails as well as complete isolation between all the analog stages When the Evolution Two is placed in stand by all the analog circuitry continues to operate at the same bias current however the main analog supply voltages decrease by 30 percent The result is a corresponding 30 percent reduction in power consumption and heat without the need to wait for the electronics to warm up before listening Advanced Microprocessor Control and Custom Software A user menu allows extensive customization of the preamplifier operation includ ing but not limited to input names input specific gain trims Theater Through put display brightness and 12 volt triggers Integration is supported via RS 232 12 Volt trigger and RC 5 inputs as well as an IR transmit
22. ave the menu mode This function enables you to access information about the preamplifier software EEPROM and PC Boards The PC Boards are listed in the left margin on this page Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select INFO 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 show the software ver sion number 3 Rotate the level control knob clockwise or press the up key The front panel display shows the EEPROM version number 4 Rotate the level control knob clockwise or press the up key again The front panel display shows the PC board version number 5 Press the enter button or key Use the level control knob or the up and down keys to scroll through the version numbers of PC boards from the PC Boards listed at left EEPROM Electrically erasable programmable read only memory An erasable memory chip used in the Evolution Two to store menu selection information continued Input Name Options AUX AUX1 AUX2 AUX3 B 1 B 2 B 3 BYPC 1 C 2 C 3 CABLE CD CD1 CD2 CD R COMP DAC DAT DCC DISC DISC 1 DISC 2 DISC 3 DSS DVD DVD1 DVD2 DVD3 DVD A EQ GAME HI 8 LD LD1 LD2 LINE 1 LINE 2 LINE 3 LINE MDISC MIXER MON PHONO PHON1 PHON2 PROC S 1 S 2 S 3 S 4 SACD SAT SRC1 SRC2 SRC3 SURR
23. commands from any other linked preamplifier channels After the preamplifier channel is unlinked settings can be changed independent of other preamplifier channels For more information on linked preamplifier channels see Appendix CAN Link and Multiple Evolution Two Preamplifiers on page 51 O continued SECTION SEVEN Customizing the Evolution Two continued Mute This function enables you to control the mute mode The options are FULL 20 dB BACK Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select MUTE 2 Press the enter button on the preamplifier chassis front panel or the or enter key 18 on the remote control The front panel display 15 shows the default mode FULL 3 Use the level control knob or the up and down keys to select the desired option FULL or 20 dB 4 Press the enter button or key to confirm the selection The front panel display reads MUTE FULL The output of the Evolution Two is completely silenced 20dB The output of the Evolution Two is reduced by 20 dB and may still be audible Output Trigger 17 Menu Button or Key Enter or exit the menu 16 Volume Knob or Level Keys Navigate the menu hierarchy review functions and configu ration options 18 Enter Button or Key Select a configuration option or confirm a selection BACK Scroll up the menu hierarchy or exit a men
24. complete and e mail the Service Request Form in the Service Section of our website at http www krellonline com To contact the Krell Service Department TEL 203 799 9954 Monday Friday 9 00 AM to 5 00 PM EST FAX 203 795 2287 E MAIL service krellonline com WEBSITE http www krellonline com Evolution Two PRODUCT MODEL NUMBER SERIAL NUMBER To return a product to Krell please follow this procedure so that we may serve you better 1 Obtain a Return Authorization Number R A number and shipping address from the Krell Service Department 2 Insure and accept all liability for loss or damage to the product during ship ment to the Krell factory and ensure all freight shipping charges are prepaid The product may also be hand delivered if arrangements with the Service Department have been made in advance Proof of purchase will be required for warranty validation at the time of hand delivery IMPORTANT Use the original packaging to ensure the safe transit of the product to the factory dealer or distributor Krell may at its discretion return a product in new packaging and bill the owner for such packaging if the product received by Krell was boxed in nonstandard packaging or if the original packaging was so damaged that it was unusable If Krell determines that new packaging is required the owner will be noti fied before the product is returned To purchase additional packaging please contact your authorized Krell deale
25. d for an extended period of time continued SECTION SIX Evolution Two Operation continued To Turn Off Your System 1 2 3 4 Place the amplifiers in the stand by mode Press the power button on the preamplifier chassis front panel or the pwr key 3 on the remote control to switch the Evolution Two to the stand by mode Turn off the amplifiers using the back panel power switch or by disconnecting them from AC power Turn off the Evolution Two by unplugging the AC power cord from AC power Play and Record The Evolution Two allows you to listen to one source through the main output 39 or 44 while recording a different source through the record bus output 37 or 38 A main bus tape output 35 36 is also available and allows for the connection of a second recording device 1 2 Press the power button 3 on the preamplifier chassis front panel 1 to switch the Evolution Two from stand by to the operational mode Press the input selection button on the preamplifier chassis front panel or the input selection keys 8 9 10 or 11 on the remote control to select the source that you want to listen to through the main outputs Begin playing the source Use the level control knob on preamplifier chassis front panel or the level keys 16 on the remote control to adjust the volume to the desired listening level Press the record button on the preamplifier chassis front panel or the record key 13 on
26. dard of excel lence has resulted in breakthrough audio designs Evolution Two preamplifiers build on this Krell legacy Dan D Agostino remains committed to the development of new designs and tech nologies And the Krell legacy will continue to evolve with products that deliver innovative engineering perfection in build quality and outstanding audio perform ance continued SECTION ONE About Krell continued Revolutionary Krell CAST Technology Current Audio Signal Transmission termed CAST is a revolutionary method of connecting analog audio components for unparalleled sonic performance Innovative engineering combines the new Krell CAST circuitry with existing Krell Current Mode technology to create entire CAST systems that reproduce music with incredible range tonality and precision The Voltage Signal Transmission and the Traditional Audio System Traditionally signal is transmitted in the voltage domain between two components In an audio system each component is a discrete entity with unique characteris tics that act upon the musical signal independently Each component is unaware of the other components in the system The cables that connect the components also have their own electrical characteristics which affect the sonic presentation of the entire system CAST transmission unifies individual components and inter connects into an electrically linked whole The original signal remains unaltered from source
27. e balance phase record mute and input selections are instantaneously transmitted between linked preamplifier channels Evolution Two preamplifiers use CAN Link to operate in linked mode Clone A method of transmitting custom configurations between linked preamplifier chan nels Inputs and Outputs Balanced A symmetrical input or output circuit that has equal impedance from both input terminals to a common ground reference point The industry standard for profes sional and sound recording installations balanced connections have 6 dB more gain than single ended connections and allow the use of long interconnect cables Balanced connections are completely immune to induced noise from the system or the environment CAST and Evolution CAST Krell Current Audio Signal Transmission or CAST is a proprietary Krell circuit tech nology for connecting analog components transmitting the audio waveform between components in the current domain rather than in the voltage domain The speed and bandwidth provided by Krell CAST and its circuitry update Evolution CAST yield accurate realistic music reproduction enabling connected compo nents to perform as if they are all part of a single circuit Single ended A two wire input or output circuit Single ended connections are not recommend ed for connections requiring long cable runs Use care when using single ended connections because the ground connection is made last and broken first Turn
28. e page 39 RS 232 Control page 44 5 Balance page 34 Input Trigger page 39 40 Save page 45 Channel Assign pages 34 5 IR Out Control page 40 Software Clone page 45 6 Clone page 35 6 Link Control page 41 Tape Input page 46 Display page 36 7 Mute page 42 Theater Mode page 47 Info page 37 Output Trigger page 42 43 Volume Display page 48 Input Level Trim page 38 RC 5 Control page 43 Navigation Conventions Navigating the Evolution Two menu is straightforward and consistent throughout using four functions and the menu option BACK 17 Menu Button or Key To enter the menu press the menu button on the preamplifier chassis front panel or the menu key on the remote control Once you are in the menu you can press the menu button or key to exit the menu 16 Volume Knob or Level Keys Use the volume knob on the preamplifier chassis front panel or the up and down keys on the remote control to scroll forward and backward through the menu hier archy Each menu list is a continuous loop 18 Enter Button or Key Press the enter button on the preamplifier chassis front panel or the enter key on the remote control to select a function or a configuration option and to confirm a selection Only the enter button on the preamplifier chassis front panel may be used to initiate a clone 15 Front Panel Display The display shows the active function and configurable options BACK Select back to scroll backwards up the menu hierarchy or to
29. e Input 17 Menu Button or Key Enter or exit the menu 16 Volume Knob or Level Keys Navigate the menu hierarchy review functions and configu ration options 18 Enter Button or Key Select a configuration option or confirm a selection BACK Scroll up the menu hierarchy or exit a menu option without confirming it This function enables you to select either S 4 or B 3 as the tape input The input that is not selected operates as a normal input The options are B 3 S 4 NONE Enter the menu then 1 Use the level control knob on the preamplifier channel front panel or up and down keys 16 on the remote control to select TAPE INPUT 2 Press the enter button on the preamplifier channel front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode s 4 3 Use the level control knob or the up and down keys to select the desired option S 4 B 3 NONE Or BACK 4 Press the enter button or key to confirm the selection The front panel display reads TAPE INPUT NONE When the tape input is set to NONE both S 4 and B 3 act as normal inputs not as tape inputs Theater Mode This function enables you to select theater mode volume for a particular input Use this function when connecting the output of a preamp processor to the Evolution Two for home theater applications Configuring an input for theater mode sets that input for unity gain and suspends the level control of
30. e is not active if a preamplifier channel is not linked At least two linked pre amplifier channels s are required for balance to activate For more information on linked preamplifiers channels see Appendix CAN Link and Multiple Evolution Two Preamplifiers on page 51 Channel Assign 17 Menu Button or Key Enter or exit the menu 16 Volume Knob or Level Keys Navigate the menu hierarchy review functions and configu ration options 18 Enter Button or Key Select a configuration option confirm a selection BACK Scroll backwards through the menu hierarchy exit a menu option without confirming it This function enables you to override the factory set channel assignments The options are FORCE LEFT FORCE RIGHT FORCE NONE NO OVERRIDE Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select CHANNEL ASSIGN 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode NO OVERRIDE 3 Use the level control knob or the up and down keys to select the desired option NO OVERRIDE FORCE LEFT FORCE RIGHT Or FORCE NONE 4 Press the enter button or key to confirm the selection The front panel display reads CHANNEL ASSIGN FORCE LEFT Use to make a left channel respond as a right channel FORCE RIGHT Use to make a right chann
31. e or decrease system volume level or with the balance key 22 to adjust balance The level control knob or keys also select menu options that customize the Evolution Two See Customizing the Evolution Two on page 32 Navigate Customize 17 Menu Button or Key Use this button or key to access the menu functions of the Evolution Two For more information see Customizing the Evolution Two on page 32 18 Enter Button or Key Use this button or key to configure the menu functions of the Evolution Two For more information see Customizing the Evolution Two on page 32 continued SECTION FOUR Anatomy of an Evolution Two continued Remote Control Description See Figure 2 on page 16 The Evolution Two Monaural Preamplifier remote provides all of the power pream plifier level control and navigate customize functions outlined under Front Panel Description pages 17 19 The remote control provides additional functions including CD functions and menu configuration accessed using only the remote control keys Battery Installation and Removal The Evolution Two preamplifier remote control uses 2 AAA size 1 5 Volt batteries Batteries are included with the shipment To install the batteries 1 Remove the remote control backplate using the supplied T 10 Torx wrench 2 Install the batteries following the battery position diagram on the plastic bat tery receptacle 3 Replace and secure the backplate Notes Replace batteries w
32. el respond as a left channel FORCE NONE The preamplifier channel ignores balance selections Use this option to set up more than 2 preamplifier channels NO OVERRIDE Return to CHANNEL ASSIGN Serves the same function as BACK in all other menu items For more information on linked preamplifiers see Appendix CAN Link and Multiple Evolution Two Preamplifiers on page 51 Clone This function enables you to transfer configured functions between linked pream plifier channels There is no need to configure multiple menu choices for each pre amplifier channel Clone insures that where desired the configuration of functions for multiple preamplifier channels is identical The option is CLONE BEGIN Enter the menu then 1 Identify the clone transmitter and clone receiver The clone transmitter is the preamplifier channel that transmits the clone and the clone receiver s is are the preamplifier channel s that receive s the clone 2 Use the level control knob on the preamplifier chassis front panel 1 of the clone transmitter or the up and down keys 16 on the remote control to select CLONE 3 Press the enter button on the preamplifier chassis front panel 1 of the clone transmitter or the enter key 18 on the remote control The front panel display 15 reads CLONE BEGIN 4 Press the enter button or the enter key again The clone transmitter display reads CLONE TRANSMIT and the clone receiver display s read s CLONE
33. exit a menu option without confirming it The first list you see in the menu is the list of configurable functions Select a con figurable function to view a submenu the list of options that configure the func tion You can configure some options as well using a second submenu B Menu Functions AC Mains This function enables you to operate the Evolution Two from a switched AC outlet If AC Mains is set to On the preamplifier turns on immediately by passing stand by Thereafter you may switch the preamplifier to and from stand by using the power button or pwr key 3 The options are OFF ON Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select AC MAINS 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode OFF 3 Use the level control knob or the up and down keys to select the desired option OFF or ON 4 Press the enter button or key to confirm the selection The front panel display reads AC MAINS OFF The Evolution Two switches to stand by mode when it detects AC power ON The Evolution Two turns on immediately bypassing the stand by mode when it detects AC power Backlight This function enables you to control the blue power indicator brightness The options are OFF LOW 25 MED 50 HIGH 100 E
34. hen remote control function becomes intermittent Remove batteries if the remote control is not used for a long period of time Battery leakage can damage the remote control Preamplifier Functions 21 Main Bus Key Use this key to select the input for the main bus output The red main LED illu minates when this function is selected For more information see Play and Record on page 30 Level Control 22 Bal ance Key Use this key along with level keys or the level control knob 16 on the pream plifier chassis to balance left and right output levels The front panel display 15 shows the left and right balance offset Compact Disc Functions The compact disc keys of the Evolution Two remote control are functional with all Krell compact disc players 23 24 25 26 27 Pause Key Use this key to temporarily suspend playing the current compact disc track Press pause again or press the play key 24 to resume playing the track at the point pause was engaged Play Key Use this key to begin compact disc playback Stop Key Use this key to end compact disc playback Track Forward and Back Keys Use these keys to select and begin playing the track that follows or precedes the current track Search Forward and Back Keys Press and hold these keys to scroll forward or backward through the current track Note For information on track programming functions refer to the owner s reference of your Krell compact d
35. ier channel measures 17 3 in 43 8 cm wide by 7 3 in 18 5 cm high by 18 5 in 47 cm deep The Evolution Two preamplifier requires at least 2 inches of clearance on each side and at least two inches of clearance above the component to provide adequate ventilation Installation inside cabinetry may require additional ventilation AC Power Guidelines The Evolution Two preamplifier has superb regulation and does not require a dedi cated AC circuit Avoid connections through extension cords or multiple AC adapters High quality 15 amp AC strips are acceptable The use of AC line condi tioning devices is not recommended The features provided by these devices are already on board the Evolution Two For more information see Separate Power Supply on page 7 soron THREE Quick Start To access the full array of available functions for the Evolution Two Monaural Preamplifier please read the entire owner s reference manual The abbreviated routine in this Quick Start section will allow you to connect and operate the Evolution Two quickly and enjoy its basic functions Evolution Two preamplifier channels may be operated independently or they may be operated in linked mode using CAN Link Connecting the Evolution Two to Your System Position each power supply and preamplifier chassis where you intend to use connected channels Do do not move the chassis after they are connected 1 Connect the power supply chassis and the pre
36. ing service on this unit on an exchange basis only any parts and or products returned to Krell for exchange become the property of Krell No expressed or implied warranty is made for any Krell product damaged by acci dent abuse misuse natural or personal disaster or unauthorized modification Any unauthorized voltage conversion disassembly component replacement perforation of chassis updates or modifications performed to the unit will void the warranty In the event that Krell receives a product for warranty service that has been modi fied in any way without Krell authorization all warranties on that product will be void The product will be returned to original factory layout specifications at the owner s expense before it is repaired All repairs required after the product has been returned to original factory specifications will be charged to the customer at current parts and labor rates All operational features functions specifications and policies are subject to change without notification To register your product for warranty benefits please complete and return the Warranty Registration Card enclosed in the shipping box within 15 days of purchase Thank you Return Authorization Procedure If you believe there is a problem with your component please contact your dealer distributor or the Krell factory to discuss the problem before you return the com ponent for repair To expedite service you may wish to
37. input trigger commands NORMAL The Evolution Two responds to 12 V input trigger commands THEATER The Evolution Two responds to 12 V input trigger commands and the theater mode enabled input is selected automatically See Theater Mode on page 47 IR Out Control 17 Menu Button or Key Enter or exit the menu 16 Volume Knob or Level Keys Navigate the menu hierarchy review functions and configu ration options 18 Enter Button or Key Select a configuration option or confirm a selection BACK Scroll up the menu hierarchy or exit a menu option without confirming it This function enables you to access Evolution Two IR commands and program a learning remote control Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select IR OUT 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode B 1 MAIN 3 Use the level control knob or the up and down keys to select the desired IR command from the list 4 Press the enter button or key to send the command out via the preamplifier front panel IR transmitter 7 The stand by LED 4 on the preamplifier chassis flashes indicating that the command has been sent 5 Repeat Steps 2 4 for each of the commands you wish to transmit 6 Press the enter button or key to confirm the selec
38. isc player Amplifier Functions 28 Amp Pwr Key 29 Use this key to activate Krell amplifiers connected to your system Sel Meter Select Key Use this key to select the meter range of the power meter scale on the front of a Krell Evolution One power amplifier Please refer to the Evolution One Owner s Reference for more information continued SECTION FOUR Anatomy of an Evolution Two continued Figure 3 Evolution Two Preamplifier Chassis and Power Supply Chassis Back Panels KRELL 5 S 232 IN LINK UNK INPUTS JL MAIN OUTPUTS J L 12voc Power DOC pecs l o oo 32 31 3335 36 37 38 39 40 41 47 SUPPLY KABL 5080 Hz BIGADMIN RE SUPPLY FUSE NO USER SERVICEABLE PARTS INSIDE MADE IN USA Inputs Outputs Remote Link Control Phono Power 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 I 48 46 47 Balanced Inputs B 1 B 2 B 3 Single ended Inputs S 1 S 2 S 3 S 4 Balanced Tape Input B 3 Single ended Tape Input S 4 CAST Inputs C 1 C 2 C 3 Main Bus Balanced Tape Output Main Bus Single ended Tape Output Record Bus Balanced Tape Output Record Bus Single ended Tape Output Balanced Main Output Single ended Main Output CAST Outputs RC 5 Input RC 232 Input 12 VDC In Out CAN Link In Out Phono Power Port DC Power Connecto
39. level 3 To return the Evolution Two preamplifier to the stand by mode press the power button or pwr key Krell recommends leaving the Evolution Two in the stand by mode when it is not playing music sono FOUR Anatomy of an Evolution Two This section describes Evolution Two Monaural Preamplifier functions Figure 1 Evolution Two Preamplifier Chassis and Power Supply Chassis Front Panels EVOLUTION Two 34 6 7 17 18 5 8 9 10 11121314 16 2 o KRELL 4 Chassis 1 Preamplifier Chassis 2 Power Supply Chassis Power 3 Power Button 4 Stand by LED 5 Power Backlight Remote 6 IR Sensor Functions 7 Infrared Transmitter LED Preamplifier 8 Single ended Input Functions Selection Buttons 9 Balanced Input Selection Buttons 10 CAST Input Selection Buttons 11 Tape Button and LED 12 Mute Button and LED 13 Record Button and LED 14 Phase Button and LED E Inset Evolution Two Preamplifier Channel Front Panel View Display 15 Front Panel Display Level 16 Level Control Knob 49 Navigate 17 Menu Button Customize 18 Enter Button 19 Preamplifier Chassis Feet 20 20 Power Supply Chassis Feet O continued SECTION FOUR Anatomy of an Evolution Two continued Figure 2 Evolution Two Remote Control 42 a ol Oo G REC 13 14 C 21
40. nd remove the top layer of foam You see these items 1 Evolution Two preamplifier chassis 1 Evolution Two power supply chassis 1 AC Power cord 1 12 pin DC cable 1 RJ 45 control cable 1 remote control 2 AAA size 1 5 Volt batteries for the remote 1 T 10 Torx wrench for the remote control 1 packet containing the owner s reference and warranty card continued SECTION TWO Unpacking and Placement continued To Remove the Preamplifier from the Shipping Box continued 2 Carefully remove the preamplifier chassis power supply chassis and acces sories from the box 3 Place the the preamplifier chassis and power supply chassis in a safe location and remove the protective plastic wrapping 4 Place the power supply chassis where you intend to use the assembled pre amplifier Krell recommends that you place the preamplifier chassis on top of the power supply chassis You can make 2 identical preamplifier oower supply stacks as individual left and right channels or one 4 chassis stack with both channels combined in one stack 5 Repeat Steps 1 5 for the remaining preamplifier channel s Placement Before you install an Evolution Two preamplifier into your system please follow the guidelines in this section to select a location for your component This will facili tate a clean trouble free installation The Evolution Two preamplifier does not require a special rack or cabinet for installation Each preamplif
41. nel plug the AC power cord into AC power The front panel display 15 scrolls through EVOLUTION 2 SOFTWARE VERSION and the red stand by LEDs illuminate 4 indicating that the Evolution Two preamplifier is in stand by mode The scrolling stops when the Evolution Two is ready to be powered on Note Use only the power cord provided with the preamplifier channel to make the connec tion to AC power Operation with a power cord other than the one supplied by Krell could induce noise limit current or otherwise impair the ability of the preamplifier chan nel to perform optimally Operating the Evolution Two Linked Mode After the Evolution Two is connected to your system and to AC power and the front panel display 15 has stopped scrolling begin operation 1 Press the power button on either preamplifier chassis front panel or the pwr key 3 on the remote control The blue backlights illuminate the red stand by LEDs 4 turn off and the front panel displays read INITIALIZING The front panel displays show the factory default input s 1 and level INF The Evolution Two is now in the operational mode 2 With the Evolution Two preamplifier output muted or the volume fully attenuat ed select a source manually using the front panel input select buttons or the input select keys on the remote control 8 9 10 11 Start playing the source Use the level control knob or level keys 16 to set the volume to a comfortable listening
42. ng rear panel input that is con nected to an analog tape source Either B 3 or S 4 82 33 may be configured as a tape input When you configure either input the other input is available as a normal input The red tape LED illuminates when the tape input is selected The front panel display 15 shows TAPE and the main volume level To cus tomize tape operation see Tape Input on page 46 Mute Button and LED or Key Use this button or key to mute the preamplifier channel output To unmute press the mute button again The red mute LED illuminates when mute is selected To customize mute operation see Mute on page 42 Record Button and LED or Key Use this button or key to select the desired input for the record bus The red record LED illuminates when record is selected The front panel display 15 shows the selected record input and the main volume level To return to the main input display press the record button again See Play and Record on page 30 Phase Button and LED or Key Use this button or key to invert the absolute polarity of the main output 180 degrees The red phase LED illuminates when phase is selected Display 15 Front Panel Display The front panel display provides preamplifier channel status messages includ ing input and record bus status tape output status volume level balance off set and menu selections Level Control 16 Level Control Knob or Level Keys Use this knob or keys to increas
43. nter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select BACKLIGHT 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 reads BRIGHTNESS 3 Press the enter button or the enter key again The front panel display shows the default mode HIGH 4 Use the level control knob or the up and down keys to select the desired brightness OFF LOW MED HIGH 5 Press the enter button or key to confirm the selection The front panel display reads BRIGHTNESS continued SECTION SEVEN Customizing the Evolution Two continued Balance This function enables you to select the balance between the left and right chan nels The options are CENTER L 5 5 dB lt R 5 5 dB gt Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select BALANCE 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode CENTER 3 Use the level control knob or the up and down keys to select the desired bal ance option from 0 to 5 dB in 5 dB increments left or right 4 Press the enter button or key to confirm the selection The front panel display reads BALANCE Balanc
44. on system enables all linked preamplifier channels to be controlled from any single linked preamplifier channel in the system CAN Link logic distinguishes between left and right chan nels This distinction is of specific significance in the following situations 1 The connection of multiple preamplifier channels 2 The control of the Evolution Two using a third party remote control system via the infrared IR transmitter 7 and the RC 5 42 and RS 232 43 connectors 3 The use of the balance and channel assign functions via the menu button or key 17 CAN Link logic is transparent during the normal operation of a stereo pair of linked Evolution Two preamplifiers To Connect Multiple Evolution Two Preamplifiers via CAN Link After the power supply chassis is connected to the preamplifier chassis with the 12 pin DC cable 1 Connect one RJ 45 control cable from either CAN Link connector 45 on the back panel of any preamplifier chassis 1 to either CAN Link connector on any other preamplifier chassis The two connected preamplifier channels are now linked 2 Repeat Step 1 for each additional preamplifiers you want to link continued Appendix CAN Link and Multiple Evolution Two Preamplifiers continued Left Right Channel Orientation Evolution Two preamplifiers are assembled as left or right channels Preamplifier RCA connectors 31 36 38 40 are color coded Left preamplifier channels are assembled with
45. oncealed The Evolution Two also offers balanced operation The circuitry and connections associated with balanced operation not only can minimize sonic loss but also are immune to induced noise especially for installations using long cables XLR Pin Configuration Pin 1 Ground Pin 2 Non inverting 0 Pin 3 Inverting 180 Inputs and outputs are located on the Evolution Two back panels Maintain the correct left right orientation when hooking up your system Left Right Channel Orientation Evolution Two preamplifiers are assembled as left or right channels Preamplifier RCA connectors 31 36 38 40 are color coded Left preamplifier channels are assembled with white RCA connectors and right preamplifier channels are assembled with red RCA connectors Connection Steps Position each power supply and preamplifier chassis where you intend to use the connected channels Do do not move the connected chassis after they are assembled The following steps describe how to connect an Evolution Two preamplifier to your system 1 Connect each power supply chassis and preamplifier chassis with the 12 pin DC cable provided using the DC power connectors 47 on the back panels 1 2 IMPORTANT Never connect two power supplies together 2 In order to operate the Evolution Two preamplifier in linked mode connect the preamplifier channels together with the supplied RJ 45 control cable In linked mode functions including powe
46. ower supply illuminate when the Evolution Two is plugged into a standard AC wall receptacle indicat ing that the Evolution Two is ready to be switched to the operational mode The stand by LEDs flash when remote control signals are received 5 Power Backlight The blue power backlight illuminates when the Evolution Two is in the opera tional mode Remote Functions on the Front Panel 6 Infrared Sensor The infrared sensor receives commands from the Evolution Two remote con trol For proper remote control operation make sure the infrared sensor is not covered or obstructed 7 Infrared Transmitter LED The stand by LED 4 on the preamplifier chassis 1 flashes when the Evolution Two sends signals via the infrared transmitter LED to a programmable remote control such as the Universal Krell Touch Screen Remote See IR Out Control on page 40 continued SECTION FOUR Anatomy of an Evolution Two continued Preamplifier Functions 8 9 10 Input Select Buttons or Keys 11 12 13 14 Use these buttons to select the corresponding rear panel input that is connect ed to a CAST C 1 C 2 C 3 balanced B 1 B 2 B 3 or single ended S 1 S 2 S 3 S 4 analog source The front panel display shows the selected input and volume level There is no dedicated tape input connector on the Evolution Two B 3 and S 4 may be selected for tape input Tape Button and LED or Key Use this button or key to select the correspondi
47. ows the option of listening to one source while recording another or the option of connecting two tape decks having different input signals Both tape outputs have single ended and voltage outputs Either the fourth single ended input or the third balanced input can be user configured as a tape monitor input allowing the opportunity to use home or professional recording equipment Separate Power Supply Housed in a separate chassis the power supply makes use of extensive electrical and magnetic shielding to keep radiated interference out of critical preamplifier cir cuits Internal line conditioning circuitry filters RF noise on the AC power and compensates for asymmetric power waveforms and DC on the mains Power for the analog stages comes from a large 170 VA toroidal transformer This transformer drives four 8 amp bridge rectifiers and 39 600 microfarads of filter capacitance Each monaural preamplifier has as much power supply capability as many stereo power amplifiers The main regulators for the analog stages are scaled down versions of those used to power the output stages of the Evolution One amplifier Operating in current mode with fully complementary gain stages and output drivers wide bandwidth low output impedance and high current capability the main regulators easily exceed the requirements of the analog stages The driver and output stages in the main analog regulators use five pairs of 150 Volt 8 Amp 40 megahertz power tr
48. plifier nor is it necessary Open loop distortion is typically less than 0 005 50 parts per mil lion and the open loop bandwidth extends to two megahertz The result is an extraordinarily wide and deep image with an open effortless sound The signal switching relays are hermetically sealed and use gold plated bifurcated contacts for maximum signal integrity Where needed multiple relays are connect ed in a T configuration to virtually eliminate crosstalk from unselected inputs The volume setting can be adjusted and displayed either numerically from O to 151 or in dB from inf to 12 0 dB Fully Balanced Discrete Volume Control The volume control is realized with a 16 bit balanced resistor ladder which uses low resistance high linearity solid state switches and discrete precision resistors Control signals for the switches are optically coupled for low noise and maximum signal integrity The bandwidth and transient response of the preamplifier circuitry are virtually unaffected by the volume setting As a result high frequencies sound especially smooth and extended and music seems to emerge from jet black silence The analog and digital signal paths are not interconnected Where neces sary digital control signals are optically coupled to analog circuits The Evolution Two has two buffered tape outputs one linked to the main signal selection bus and another with its own independent signal selection bus This all
49. preamplifier channels The power sup ply chassis must be connected to the preamplifier chassis with the provided 12 pin DC cable continued SECTION EIGHT Questions and Answers continued Troubleshooting System Noise When you mix and match high performance audio components each with its own ground potential a low frequency hum may occur in one or both loudspeakers If this happens when you place the Evolution Two preamplifier into your system follow these simple troubleshooting steps 1 2 Check that all input and output connections are of sound construction With the preamplifier channel off remove the interconnect cables the turn the preamplifier channel on If the hum disappears turn the preamplifier channel off and reinsert one of the interconnect cables Turn the preamplifier channel back on Repeat this process for each cable If the hum reappears with one or both interconnect cables reinserted the cable needs to be replaced If the interconnect cables are sound you may be experiencing a ground loop Please contact your authorized Krell dealer distributor or Krell for suggestions on how to eliminate the ground loop Appendix CAN Link and Multiple Evolution Two Preamplifiers The Evolution Two Monaural Preamplifier brings a new convenience to the opera tion of monaural preamplifiers using a sophisticated reliable control system called a controller area network CAN The CAN Link communicati
50. preamplifier level when switching sources Do not change input connections to the amplifier when the amplifier is on Use care when setting high playback levels Always lower the volume level at the first sign of loudspeaker distress On Off and Stand by Operation Linked Mode When powering on any system turn on amplifiers last When powering down turn off amplifiers first After the Evolution Two is connected to your system and to AC power and the front panel display 15 has stopped scrolling begin operation 1 Press the power button on either preamplifier chassis front panel or the pwr key 3 on the remote control The blue backlights illuminates the red stand by LEDs 4 turn off and the front panel displays read INITIALIZING The front panel displays shows the factory default input s 1 and level INF The Evolution Two is now in the operational mode 2 With the Evolution Two preamplifier output muted or the volume fully attenuat ed select a source manually using the front panel input select buttons or the input select keys on the remote control 8 9 10 11 Start playing the source Use the level control knob or level keys 16 to set the volume to a comfortable listening level 3 To return the Evolution Two to the stand by mode press the power button or pwr key Krell recommends leaving the Evolution Two in the stand by mode when it is not playing music Turn the Evolution Two off when the system is not being use
51. r IEC Power Cord Receptacle Back Panel Description See Figure 3 on page 22 The Evolution Two Monaural Preamplifier back panel provides all inout and output connections remote control inputs and outputs and the power connection Back panel features and their descriptions follow Left Right Channel Orientation Evolution Two preamplifiers are assembled as left or right preamplifier channels Preamplifier RCA connectors 31 36 38 40 are color coded Left preamplifier channels are assembled with white RCA connectors and right preamplifier chan nels are assembled with red RCA connectors Inputs 30 Balanced Inputs B 1 B 2 B 3 The Evolution Two is equipped with 3 balanced analog source inputs with XLR connectors 31 Single ended Inputs S 1 S 2 S 3 S 4 The Evolution Two is equipped with 4 single ended analog source inputs with RCA connectors 32 33 Tape Inputs B 3 and S 4 The Evolution Two is equipped with one balanced and one single ended input for use with a tape source Either input may be configured as the tape input from the menu 17 When you select the tape input 11 the other input becomes a normal input selectable using the front panel button or the remote control key 8 9 34 C 1 C 2 and C 3 CAST Inputs The Evolution Two is equipped with 3 CAST inputs with 4 pin bayonet connec tors for use with Krell CAST equipped input devices Outputs 35 36 Main Bus Outputs The Evolution Two i
52. r dis tributor or the Krell Service Department for assistance Specifications Inputs 3 CAST via 4 pin bayonet connectors 3 balanced via XLR connectors 4 single ended via RCA connectors Tape input 1 balanced via XLR connector or 1 single ended via RCA connector user configurable Main outputs 2 CAST via 4 pin bayonet connectors 1 balanced via XLR connector 1 single ended via RCA connector Tape outputs 1 balanced via XLR connector and 1 single ended via RCA connector buffered connected to main input selection bus balanced via XLR connector and single ended via RCA connector buffered connected to a dedicated record output bus a4 st Control inputs 1 RS 232 input via a 9 pin D subminiature connector 1 remote IR detector input via a 3 conductor 3 5 mm connector 1 12 VDC trigger input via 3 5 mm connector 1 preamplifier link via an RJ 45 connector Control outputs 2 individually programmable 12 VDC trigger outputs via 3 5 mm connectors 1 preamplifier link via an RJ 45 connector Power output 1 phono power output 20 VDC for KPE via a 9 pin D subminiature connector Input impedance CAST 35 Ohms Balanced 40 k Ohms Single ended 20 k Ohms Output impedance CAST gt 1 M Ohms Balanced 250 Ohms Single ended 125 Ohms Gain 12 dB CAST or balanced output 6 dB single ended output Volume control Balanced current mode 16 bit discrete R 2R ladder Input overload CAST 1
53. r volume balance phase record mute and input selections are instantaneously transmitted between linked preamplifier channels When a system with linked Evolution Two preamplifiers is powered on left right orientation is established immediately with no user intervention For more information on linked preamplifiers see Appendix CAN Link and Multiple Evolution Two Preamplifiers on page 51 3 Neatly arrange and organize wiring to and from the Evolution Two preamplifier and all components Separate AC wires from audio cables to prevent hum or other unwanted noise from being introduced into the system 4 Connect the outputs of your source equipment to the appropriate CAST 34 balanced 30 single ended 31 or tape inputs 32 33 on the Evolution Two 5 Connect the appropriate main outputs 35 41 on the Evolution Two to your amplifier 6 On each preamplifier channel connect the supplied AC power cord to the IEC power cord receptacle 48 7 On each preamplifier channel plug the AC power cord into AC power The front panel display 15 scrolls through EVOLUTION 2 SOFTWARE VERSION and the red stand by LEDs illuminate 4 indicating that the Evolution Two preamplifier is in stand by mode The scrolling stops when the Evolution Two is ready to be powered on Note Use only the power cord provided with the preamplifier channel to make the connec tion to AC power Operation with a power cord other than the one supplied by K
54. rell could induce noise limit current or otherwise impair the ability of the preamplifier chan nel to perform optimally continued SECTION FIVE Connecting the Evolution Two to Your System continued Connections Using CAN Link The Evolution Two brings a new convenience to the operation of monaural pream plifiers using a sophisticated reliable control system called a controller area net work CAN Using CAN Link any number of preamplifier channels may be linked for multichannel playback CAN Link enables all linked preamplifier channels to be controlled from any single linked preamplifier channel in the system To Connect Multiple Evolution Two Preamplifiers via CAN Link After the power supply chassis is connected to the preamplifier chassis with the 12 pin DC cable 1 Connect one RJ 45 connector from either CAN Link connector 45 on the back panel of any preamplifier chassis 1 to either CAN Link connector on any other preamplifier chassis The two preamplifier channels that are connected are now linked 2 Repeat Step 1 for each additional preamplifier channel you want to link For more information on linked preamplifier channels see Appendix CAN Link and Multiple Evolution Two Preamplifiers on page 51 sonon SIX Evolution Two Operation The Evolution Two Monaural Preamplifer is easy to operate Instructions follow for on off and stand by operation IMPORTANT Always mute or fully attenuate the
55. remote capabilities of the Evolution Two Link Control 45 CAN Link Each Evolution Two preamplifier chassis 1 has 2 RJ 45 link connectors con nected in parallel These are used to operate preamplifier channels in linked mode For more information see Connections Using CAN Link on page 28 Operation Using CAN Link on page 31 and Link Control on page 41 Phono Stage Connector 46 Power 47 48 Phono Power Port Each power supply chassis 2 has a phono power port for connecting the preamplifier to a Krell KPE phono stage Only one phono power port needs to be connected to the KPE DC Power Connector Each preamplifier channel is equipped with two DC power connectors that connect the preamplifier chassis and the power supply chassis using the pro vided 12 pin DC power cable IEC Power Cord Receptacle The IEC power connector located on the power supply chassis 2 is for use with the provided IEC standard 15 amp AC power cord sonon FIVE Connecting the Evolution Two to Your System This section describes Evolution Two Monaural Preamplifier connections and intro duces the CAN Link remote control option Input and Output Connections Krell recommends using its proprietary Krell CAST system for unparalleled sonic performance for connections between the Evolution Two preamplifier and other CAST equipped components Krell CAST uses flexible interconnecting cables that can be drawn through tight spaces and c
56. rranty Each Evolution Series preamplifier has a limited warranty of five years for parts and labor on circuitry Should this product fail to perform at any time during the warran ty Krell will repair it at no cost to the owner except as set forth in this warranty This warranty does not apply to damage caused by acts of God or nature The warranty described on this page shall be in lieu of any other warranty expressed or implied including but not limited to any implied warranty of mer chantability or fitness for a particular purpose There are no warranties which exceed beyond those described in this document If this product does not perform as warranted herein the owner s sole remedy shall be repair In no event will Krell be liable for incidental or consequential damages arising from purchase use or inability to use this product even if Krell has been advised of the possibility of such damages Proof of purchase in the form of a bill of sale or receipted invoice substantiating that the unit is within the warranty period must be presented to obtain warranty service The warranty begins on the date of the original retail purchase as noted on the bill of sale or receipted invoice from an authorized Krell dealer or distributor Previously owned equipment when re purchased from an authorized Krell dealer or distributor has the balance of the original warranty based on the original date of manufacture The warranty for Krell produc
57. s equipped with one balanced main bus output with XLR connectors and one single ended main bus output with RCA connectors Use the main bus outputs to record the input signal playing on the main outputs For more information see Play and Record on page 30 continued SECTION FOUR Anatomy of an Evolution Two continued Outputs continued 37 38 Record Bus Outputs The Evolution Two is equipped with one balanced record bus output with XLR connectors and one single ended record bus output with RCA connectors Use the record bus outputs to record a input signal other than the signal playing on the main outputs For more information see Play and Record on page 30 39 40 Main Outputs 41 The Evolution Two is equipped with one balanced output with XLR connectors and one single ended output with RCA connectors CAST Outputs The Evolution Two is equipped with two CAST preamplifier outputs with 4 pin bayonet connectors for use with Krell CAST equipped amplifiers Remote Connections on the Back Panel 42 43 44 RC 5 In Each Evolution Two preamplifier chassis 1 has an RC 5 remote input The RC 5 remote connector is used with a third party remote control system that provides RC 5 IR data with the carrier intact via a wired connection A stereo tip ring sleeve 1 8 mini connector is used in the following configuration Tip RC 5 data Ring 5 V Sleeve GND RS 232 Each Evolution Two preamplifier chassis
58. shows the default mode LINK TRANSMIT 3 Use the level control knob or the up and down keys to select the desired option LINK TRANSMIT Or LINK RECEIVE Save 4 Press the enter button or key to confirm the selection The front panel display reads RS 232 CONTROL The right terminated preamplifier channel is the link transmitter of RS 232 data Connect the RS 232 cable to the RS 232 connector on the right terminated pre amplifier channel For more information on linked preamplifier channels see Appendix CAN Link and Multiple Evolution Two Preamplifiers on page 51 This function enables you to save a copy of the current settings The options are GO BACK Enter the menu then 1 Use the level control knob on the preamplifier channel front panel or up and down keys 16 on the remote control to select SAVE 2 Press the enter button on the preamplifier channel front panel or the or enter key 18 on the remote control The front panel display 15 shows the default mode Go 3 Press the enter button or key to save the settings The front panel display reads SAVE GO Saves a copy of current settings to memory overwriting previously saved settings Software Clone This function enables you to transfer operational software from one linked pream plifier channel to another Software clone insures that where desired software for multiple preamplifier channels is identical The options are No YES Enter the menu
59. ted States of America Krell is a registered trademark of Krell Industries Inc and is restricted for use by Krell Industries Inc its subsidiaries and authorized agents Evolution Bias is a trademark of Krell Industries Inc and is a Krell technology based on U S Patent No 5 331 291 CAN Link CAST Evolution CAST and Krell Current Mode are trademarks of Krell Industries Inc All other trademarks are registered to their respective companies 2005 by Krell Industries Inc All rights reserved P N 307773 Contents List of Illustrations page iv A Letter from Dan D Agostino page 1 SECTION ONE About Krell page 3 The Krell Legacy Revolutionary Krell CAST Technology Ensuring Maximum Performance Definition of Terms SECTION TWO Unpacking and Placement page 11 Opening the Evolution Two Shipping Carton SECTION THREE Quick Start page 13 Connecting the Evolution to Your System Operating the Evolution Two SECTION FOUR Anatomy of an Evolution Two page 15 Front Panel Description Remote Control Description and Back Panel Description SECTION FIVE Connecting the Evolution Two to Your System page 26 Input and Output Connections Connection Steps Connections Using CAN Link SECTION SIX Evolution Two Operation page 29 On Off and Stand by Operation Play and Record Operation Using CAN Link SECTION SEVEN Customizing the Evolution Two page 32 Navigation Conventions Menu Functions SECTION EIG
60. ter for programming a learning remote control A built in digital network allows multiple preamplifiers to be linked together blend ing the convenience of a single chassis stereo preamplifier with the sonic perform ance obtainable only from individual monaural preamplifiers Six or more preampli fier channels can be daisy chained together and controlled simultaneously for multi zone or home theater applications The digital link allows the user settings in one preamplifier channel to be conveniently cloned to other linked preamplifier channels Similarly upgraded software in one preamplifier channel can be installed in other preamplifier channels using the digital link In the event that the DC level at any of the preamplifier channel outputs exceeds a nominal level sophisticated protection circuitry safely mutes the outputs traces the source of the excess DC and displays a diagnostic message on the main dis play On power up the microprocessor verifies that all the circuit boards in the preamplifier channel are properly connected and are compatible with the version of software installed Definition of Terms Following are the definitions of key terms used in this owner s reference Configurations CAN Link The communication system that links multiple Evolution Two preamplifier channels is a sophisticated system called a controller area network CAN Linked Mode In linked mode functions including power volum
61. the system off on prior to making or breaking single ended connections Q continued SECTION ONE About Krell continued Preamplifier Channel Also termed preamplifier or preamplifier channel A channel is one Evolution Two comprised of one preamplifier chassis and one power supply chassis Right terminated channel Any right preamplifier channel that is last in a chain of linked Evolution preampli fiers is referred to as right terminated There is only one RG 45 link cable connect ed to a right terminated channel Transmitter Also termed transmitter preamplifier The transmitter is a right terminated preampli fier channel that sends IR RC 5 and RS 232 data to the other linked preamplifier channel s or receiver s Receiver Also termed receiver preamplifier Receivers are linked preamplifier channels that receive IR RC 5 and RS 232 data from a right terminated preamplifier channel or transmitter Operation Off When the stand by power LEDs and the backlight grid are not illuminated the pre amplifier is off Stand by A low power consumption status that keeps the audio and regulator circuits at idle The stand by power LEDs are illuminated in red when the preamplifier chan nel is in the stand by mode Krell recommends leaving the preamplifier in the stand by mode when it is not playing music Operation When the backlight is illuminated in blue the preamplifier is in the operational mode and ready to pla
62. tion The front panel display reads IR OUT For a listing of IR codes see the Evolution Two developer s reference entitled RS 232 Port Sending Commands and Interpreting Data The right terminated preamplifier is the link transmitter of IR data For more information on linked pre amplifier channels see Appendix CAN Link and Multiple Evolution Two Preamplifiers on page 51 Link Control CAN Link This function enables you to link and unlink preamplifiers The options are LINKED UNLINKED Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or the up and down keys 16 on the remote control to select LINK CONTROL 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode LINKED 3 Use the level control knob or the up and down keys to select the desired option LINKED Or UNLINKED 4 Press the enter button or key to confirm the selection The front panel reads LINKED LINKED When preamplifier channels are linked power volume balance phase record mute and input selections are automatically communicated between linked pre amplifier channels All other settings remain local and may be cloned from one preamplifier channel to another See also Clone on page 35 and Software Clone on page 45 UNLINKED When a preamplifier channel is unlinked it does not respond to
63. to speaker CAST Basics Here is how a CAST audio system works Internally each CAST source transfers or amplifies current using Krell Current Mode circuitry This current signal is then output using CAST circuitry When the signal is received by a CAST input Krell Current Mode circuitry again takes over until the signal reaches the loudspeaker By maintaining the musical signal in the current domain from beginning to end an entire CAST system behaves as if it is one component With CAST circuit board properties and signal transmission aberrations between components are eliminat ed Cable impedances and their effects on the transmitted signal are non existent How CAST and Krell Current Mode Interact While CAST is a new method of transferring the musical signal between compo nents its origin stems from Krell Current Mode the technology developed to transfer the musical signal within a component CAST combined with Krell Current Mode takes circuitry signal transmission to the next evolutionary level In essence Krell Current Mode maintains the integrity of the signal within the component and CAST preserves the transmitted signal between components Together CAST and Krell Current Mode technologies unify separate Krell components into a single global circuit Krell Current Mode technology enjoys bandwidth increases up to an order of magnitude greater than their voltage based counterparts This dramatic increase in circuit bandwidth
64. ts is valid only in the country to which they were origi nally shipped through the authorized Krell distributor for that country and at the factory There may be restrictions on or changes to Krell s warranty because of reg ulations within a specific country Please check with your distributor for a complete understanding of the warranty in your country If a unit is serviced by a distributor who did not import the unit there may be a charge for service even if the product is within the warranty period Freight to the factory is your responsibility Return freight within the United States U S A is included in the warranty If you have purchased your Krell product out side the U S A and wish to have it serviced at the factory all freight and associated charges to the factory are your responsibility continued Warranty continued Krell will pay return freight to the U S A based freight forwarder of your choice Freight and other charges to ship the unit from the freight forwarder to you are also your responsibility Krell is not responsible for any damage incurred in transit Krell will file claims for damages as necessary for units damaged in transit to the factory You are respon sible for filing claims for shipping damages during the return shipment Krell does not supply replacement parts and or products to the owner of the unit Replacement parts and or products will be furnished only to the distributor per form
65. u option without confirming it This function enables you to turn the two output triggers on or off or configure them with independent delays of up to 20 seconds The options are ON OFF DELAY Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select OUTPUT TRIGGER 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode TRIGGER 1 Press the enter button or key again The front panel display shows the default mode OFF A Use the level control knob or up and down keys to select OFF ON Or DELAY Q Select DELAY You are prompted to enter a delay time of 0 20 seconds D Enter the delay time N Press enter to confirm the selection The front panel display reads DELAY O 8 Use the level control knob or up and down keys to scroll to BACK 9 Press the enter button or key to return to TRIGGER 1 10 Use the level control knob or the up and down keys to scroll to TRIGGER 2 11 Repeat Steps 3 7 to set Trigger 2 ON The 12 Volt trigger output is enabled at power on for the selected trigger Trigger 1 or 2 OFF The 12 Volt trigger output is disabled at power on for the selected trigger Trigger 1 or 2 DELAY The 12 volt trigger output is enabled at power on for the selected trigger Trigger 1
66. white RCA connectors and right preamplifier channels are assembled with red RCA connectors Right Terminated Preamplifier Channel Right preamplifier channels have a unique electrical identity under CAN Link When a system with linked Evolution Two preamplifiers is powered on the system automatically identifies the right terminated preamplifier channel and left right ori entation is established immediately with no user intervention Any right preamplifier channel that is last in a chain of linked Evolution Two pream plifiers is referred to as right terminated There is only one RG 45 link cable con nected to a right terminated preamplifier channel Example The illustration below shows the preamplifier chassis back panels of three linked preamplifier channels There are two right R channels and one left L channel In this configuration the top chassis belongs to a right terminated pre amplifier channel R right terminated one RG 45 link cable connected to the top chassis i IR RC5 and RS 232 Data Transfer from a Third Party Controller In a group of 2 or more preamplifier channels connected via CAN Link the right terminated channel is the transmitter of IR RC 5 and RS 232 data to the other linked preamplifier s or receiver s Always make IR RC 5 and RS 232 connec tions from the third party controller to the right terminated preamplifier channel Wa
67. wo preamplifier channels must be linked together using the RJ 45 cable in order for functions to be sent between preamplifier channels renamed the B 1 input on one of the preamplifier channels Why does it still read B 1 on the other preamplifier channel When two or more preamplifier channels are linked basic functions such as volume and input selection are simultaneously executed by all linked preampli fier channels In order for linked preamplifier channels to recognize customized menu functions such as renaming inputs the clone procedure must be per formed For more information see Clone on page 35 and Software Clone on page 45 When adjust the balance the sound moves to the side that is opposite my adjustment What is wrong The Evolution Two preamplifier is preset from the factory as either a left or a right preamplifier Make sure the preamplifier chassis with the white connectors is used for the left channel and the preamplifier chassis with red connectors is used for the right channel What should do if see a Dc ERROR message The Evolution Two preamplifier has a sophisticated DC protection system that detects potentially harmful DC Please contact Krell to determine what action to take if you see a DC error message The Evolution Two preamplifiers are plugged into AC outlets and the link cables are connected but the preamplifier channels do not power on What should do The link cables only pass data between
68. y music Technology Krell Current Mode A proprietary Krell circuit topology in which the audio gain stages of a component operate in the current rather than voltage domain This unique technology provides the component with exceptional speed and a wide bandwidth sonos WO Unpacking and Placement This section describes the procedures for safely unpacking and placing your Evolution Two Monaural Preamplifier Each Evolution Two preamplifier channel is shipped in 1 carton consisting of 2 chassis 1 power supply chassis and 1 pream plifier chassis Opening the Evolution Two Shipping Carton Each Evolution Two shipping carton measures 22 3 in 66 6 cm wide by 23 5 in 59 7 cm high by 16 2 in 41 1 cm deep Preamplifier Chassis Each preamplifier chassis measures 17 3 in 43 8 cm wide by 3 7 in 9 5 cm high by 18 5 in 47 cm deep and weighs 21 Ibs 9 5 kg Power Supply Chassis Each power supply chassis measures 17 3 in 43 8 cm wide by 3 7 in 9 5 cm high by 17 3 in 43 8 cm deep and weighs 31 Ibs 14 kg Left Right Channel Orientation Evolution Two preamplifier channels are assembled as left or right channels Preamplifier RCA connectors 31 36 38 40 are color coded Left preamplifier channels are assembled with white RCA connectors and right preamplifier chan nels are assembled with red RCA connectors To Remove the Preamplifier Channel from the Shipping Carton 1 Open a shipping carton a
69. you The preamplifier plays a vital role in audio playback At no other point in the repro duction process is the music so vulnerable to change The signal level at the pre amplifier stage is small and is particularly susceptible to noise and distortion In order to solve this problem the Evolution Two employs Krell Current Mode gain stages from input to output and Current Audio Signal Transmission CAST receivers and transmitters Unprecedented in Krell design history these unique topologies combine in the Evolution Two preamplifier to form a circuit that has no audible sonic signature The Evolution Series represents a new direction for Krell where breakthrough cir cuit topologies also represent the vanguard in convenience and control Sophisti cated communication circuitry allows from two to eight preamplifiers to be linked to a single master from which all user interface is accomplished The Evolution Two Monaural Preamplifier is designed to complement perfectly the Evolution One Monaural Power Amplifier Combine the Evolution One and Two with my new LAT 1000 loudspeakers and experience the extraordinary capabilities of an Evolution System continued A Letter from Dan D Agostino continued have some exciting news for you Work on a new source component for the Evolution Series is ongoing as of this writing Possessed of the unique Evolution technologies that power the amplifier and preamplifier this Evolution source

Krell Industries EVOLUTION TWO MONAURAL PREAMPLIFIER User's Manual

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