McIntosh C48 audio amplifier
Contents
1. DIGITAL AUDIO INPUTS 120V 50 60Hz AUTO RS 232C MAIN OUTPUT 1 TRIG 1 AUX CD2 TUNER USB DIG DIG 1 30 WATTS X DO NOT OPEN AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR 00000 EE GE Ce N A D A t Melntosk C48 AUDIO PREAMPLIFIER PASS THRU OUTPUT 2 TRIG 2 SRVR DVD CD NUMBER McINTOSH LABORATORY INC BINGHAMTON NY 13903 MADE IN USA Connecting Components Connecting Components EEE SSTR A MYM M Y Y RMPRO XTR FM MI IDTCTCTR OOO S BBPE gt A The C48 has the ability to automatically switch power On Off to Source Components via the Power Control connections The Data Port Connections allow for the remote operation of basic functions using the C48 Remote Control With an external sensor connected to the C48 remote control operation of the system 1s possible from another room and or when the C48 1s located in a cabinet with the doors closed The connection instructions below together with the C48 Input Output Control Connection Diagrams located on the separate folded sheets Mc1A 1B and Mc2A are an example of a typical audio system Your system may vary from this however the actual components would be connected in a similar manner For additional information refer to Connector and Cable Information on page 4 Note Source components may be connected to the C48 Balanced Inputs or Digital Inputs instead of Unbalanced Inputs Refer to Setup Reassigning Inputs to ac2. Reset of Microprocessors In the unlikely event the controls of the C48 stop func tioning the microprocessors can be reset by perform ing the following 1 Press and hold the STANDBY ON Push button for approximately ten seconds and then release 2 To switch the C48 back on press the On STAND BY ON Push button Note This can be performed with the C48 On or in the Standby Mode Resetting the C48 to default settings If it becomes desirable to reset all the adjustable set tings Setup and Trim Settings to the factory default values perform the following 1 Press both the PROCESSOR and OUTPUT 2 Push buttons until the Front Panel Display indi Figure 75 cates FACTORY RESET refer to figure 75 then release the two push buttons Several seconds later the Front Panel Display will indicate FAC TORY RESET COMPLETE and the C48 will e qo ees ppm nam pam FEE TOR Bere fem Pee um a con e E a Hann mmmn Emmm aa gomme megua gumun Tann f em um H Jm ie i Ds en BE Figure 76 switch Off Refer to figure 76 2 Press the STANDBY ON Push button and the C48 will resume operation How to Operate the C48 con t 23 VOLUME E i Ay a C48 AUDIO PREAMPLIFIER OOO O 2 STANDBY ON OUTPUT 1 EQ BYPASS RECORD OUT L pL ODADAN irao 90 T ojo le J 24 Photos Mintosk C48 AUDIO PREAMPLIFIER VOLUME 25 Specificat
3. tion presets tracks on discs or selections on a Music Server Disc and Track Use the AM disc and FM track Push buttons when a Disc Player or Music Server is being used Tuner Push buttons Press the AM or FM Push button to select the desired broadcast band Press and release the Channel Up A or Down V Push button to seek the next available station Press and hold a Channel Up A or Down V Push button to seek continuously from station to sta tion Volume Press the Up or Down W VOLUME Push button to raise or lower the listening volume level Note The Record Signals present at REC OUTPUTS are not affected by volume changes Pause Press the Pause IN Push button to perform various functions on a variety of McIntosh Components It will also pause the playing of a disc or tape player Trim Press the TRIM Push button until the desired Trim function Balance Trim Level etc appears on the Front Panel Information display then press the LEV EL Up A or Down Y Push button to adjust the Trim setting Note Press the TRIM Push button to recall the last Trim function selected For additional information on the Trim Functions refer to pages 18 19 and 20 Amplifier Selection Press the BLUE Setup Push button followed by the AM Output 1 or FM Output 2 Push button to con trol the rear panel Audio OUTPUTS 1 2 ON or OFF and Power Control OUTPUT 1 OUTPUT 2 These OUTPUTS provide signals to a Power Amplifier or oth
4. 50 8cm depth behind the front panel Allow 1 7 16 inch 3 66cm in front of the mounting panel for knob clearance Be sure to cut out a ventilation hole in the mounting shelf according to the dimensions in the drawing 17 3 16 43 66cm C48 Front Panel Custom Cabinet Cutout Cabinet Front Panel Cutout Opening for Custom Mounting Cabinet Front Ro Panel es j C48 Side View l in Custom Cabinet 2 1 4 5 72cm 23 18cm C48 Bottom View ee 4 A in Custom Cabinet gt f Cutout 1 Opening Ru for Ventilation 1 1 16 2 70cm e 12516 _____ Note Center the cutout Horizontally 31 27cm on the unit For purposes of clarity the above illustration is not drawn to scale To Rear Panel Connections Rear Panel Connections The identification of Rear Panel Connections for the C48 Audio Preamplifier 1s located on a separate folded sheet contained in the Owner s Manual Packet Refer to separate sheet Mc2B for the Rear Panel Connections C48 Audio Preamplifer Rear Panel RECORD INPUTS T DVD M MM GS O O 0000000000 O O GND 0000000000 PHONO AR N y N y NACUTAICO rrU N D VP D o o o nA4CUZ rrU r O U l P U T S L POWER CONTROL DATA PORTS
5. appears on the Front Panel Information Display Refer to figure 21 Ll my m m h al a pa e epa Ui un HH tah Da imm O Tee e HL RA 7 H Figure 21 2 Rotate the VOLUME ADJUST Control until CODES ALT appears on the Front Panel Infor mation Display Refer to figure 22 Figure 22 3 Press the EQ BYPASS SETUP Push button to exit the Setup Mode 4 To change the C48 Remote Control to the Alter nate Codes perform the following steps A Press the Mc Push button B Press the SET Push button until the Mc Push button flashes twice C Press the 3 2 4 2 and 9 Push buttons within 5 seconds D The Mc Push button flashes twice Note To reset the Remote Control to normal codes perform steps A and B then enter 3 2 4 2 and 8 for step C 5 Press the VOLUME UP DOWN Push button on the Remote Control to verify proper operation How to Operate the C48 Power On and Off The Red LED above the STANDBY ON Push button lights to indicate the C48 is in Standby mode To switch ON the C48 press the STANDBY ON Push button on the Front Panel or the Power On Push button on the Remote Control The C48 will go through a brief startup initialization with the Front Panel Information Display indicating the last used source and volume setting this 1s followed by the volume setting indication starting at zero and then increasing to the last used volume setting Refer to figures 50 51 52 and 53 T
6. perform the following steps Note The audio signal present at the RECORD OUT Jacks is unaffected by the Equalizer settings 1 Select the desired Input Source 2 Select EQUALIZER MODE Enable as indicated on the Front Panel Information Display Refer to figure 6l Figure 61 3 Set the EQUALIZER MODE to be either enabled or bypassed Refer to figure 62 Figure 62 After approximately 4 seconds the Information Display returns to indicate the Source Selection and Volume Level MONO STEREO MODE By default the Stereo Mode is active for all Input Sources however any Input Source may be assigned to Mono Mode To change Stereo Mode to Mono for a given Input Source perform the following steps Note The audio signal present at the RECORD OUT Jacks is unaffected by the Stereo Mono setting How to Operate the C48 con t 1 Select the desired Input Source 2 Select MONO STEREO MODE Ste reo as indicated on the Front Panel Information Display Refer to figure 63 Figure 63 3 Set the MONO STEREO MODE for either STE REO or MONO Refer to figure 64 en e m En pn L al Ps pm F RPE O mH le man nnas H 7 Danna Fun H H a Enn usam Figure 64 After approximately 4 seconds the Information Display returns to indicate the Source Selection and Volume Level DIGITAL AUDIO DISPLAY By default the Digital Audio Display is switched Off To display information about the type of di
7. type A to type B con nectors from the C48 USB D A Input to an avail able USB connector Ground Connections 24 Connect the Ground Cable coming from the Turn table to the C48 GND Binding Post AC Power Cords Connections 25 Connect the C48 and any remaining components AC Power Cords to a live AC outlet as illustrated 10 LED illuminates during the time a remote command 1s sent to the C48 Switches the Trigger 1 and or 2 Power Control Jack s On Off refer to Setup Power Control TRIG 1 and TRIG 2 on page 15 for addi tional information Selects a Disc Player Music Server or Recorder Function Seek Sta tions Up or Down the AM FM Dial Select AM FM Station Presets and performs various functions on a variety of McIntosh Components Displays On Screen Functions on the McIntosh Music Server and a variety of other McIntosh Components Adjusts the volume level up or down Mutes the audio Selects AM Tuner Operating Functions and Disc Selection on certain McIntosh Disc Players En Functions as a shift key when used with the AM or FM push buttons to select Output 1 or 2 Scrolls through the available C48 Inputs MeIntosh O ETA GID s am Remote Control Push Buttons Press to Power the C48 ON Press to Power the C48 OFF Press to change broadcast bands on an external McIntosh Tuner con nected Select certain functions on a variety of McIntosh Components Selects On Screen Function
8. 4 To exit from the Setup Mode press the EQ BY PASS SETUP Push button The LED above the TRIM Push button will extinguish and the Front Panel Display will revert back to 1ts normal dis play Refer to figure 1 Default Settings The Default Settings Chart below indicates the Func tion Name Default Setting and the Page Number for additional information Default CN McIntosh C48 SOURCE INPUT connector type DISPLAY Bright ness PASSTHRU TRIG 1 Output MAIN Action TRIG 2 Output MAIN Action COMM PORT 115200 Baud Rate REMOTE NORM Codes Firmware Version AAA as The C48 functionality 1s controlled by internal soft ware that 1s know as Firmware The Version of the Firmware in the C48 can be identified at any time by utilizing the Setup Mode 1 Press and hold the C48 Front Panel EQ BYPASS SETUP Push button to enter the Setup Mode 2 The number after the character V is the Firm ware number Refer to figure 2 3 To exit the Setup Mode press the EQ BY PASS SETUP Push button Source Inputs Reassignment The C48 provides the ability to reassign the non Phono Inputs High Level to either one of two Bal anced Inputs or one of the four Digital Inputs In the first example the CD2 Input will be reassigned from the unbalanced CD2 RCA Jacks to the BAL ANCED 1 XRL Connector Notes 1 Any one of the Default Inputs may be swiched Off If any input is switched Off its name will no longer appear o
9. PERSONNEL third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus Only use attachments accessories specified by the manufacturer Use only with the cart stand tripod bracket or table specified by the manu facturer or sold with the appa ratus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service person nel Servicing is required when the apparatus has been damaged in any way such as power 0 ZEN The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing instructions in the literature accompanying the appliance 15 16 Li 18 19 To prevent the risk of electric shock do not remove cover or back No user serviceable parts inside supply cord or plug 1s damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped D
10. only if they are all in good serviceable condition If a shipping carton or any of the interior part s are 4 017937 Plastic foot needed please call or write Customer Service Depart 4 400159 10 32 x 3 4 screw ment of McIntosh Laboratory Refer to page 4 Please 4 404080 10 Flat washer see the Part List for the correct part numbers TOP PAD an UNIT WITH 4 FEETON BOTTOM COVER FOAM PLUG SUSE Se IMPORTANT Read Ab FOOT Dim i anne gt END CAPS 4 10 32 x 3 4 A SCREW WITH ae SO Fo TT INSIDE WASHER 4 SU I Ze CARTON BOTTOM PAD SHIPPING CARTON INSIDE CARTON 27 McIntosh Laboratory Inc 2 Chambers Street Binghamton NY 13903 www mcintoshlabs com The continuous improvement of its products 1s the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without notice Printed in the U S A McIntosh Part No 04122801
11. E 1 OUTPUT 2 STANDBY ON O O 4 menu P gt Figure 50 Signals from going to the separate Power Amplifiers press the same Push button s a second time Headphones Jack Connect a pair of dynamic headphones to the Head phones Jack with a 1 4 0 635cm stereo phone type plug for private listening Press OUTPUT 1 and or 2 Push buttons to mute the Loudspeakers Note The Headphone Output is optimized for imped ances ranging from 100 to 600 ohms How To Make a Recording 1 Select the desired signal source you wish to record by using the Front Panel INPUT Control or the appropriate Source Push button on the Remote Control 2 Adjust the record level using the recorder level con trol and proceed with the recording process 3 Listen to the playback of the program source just recorded by selecting the Input Source connected to the recorder component output Equalizer Controls The C48 Equalizer has five Frequency Controls which will raise or lower by 12dB the amplitude of the band of frequencies centered at the frequency marked above the controls The center frequencies of these controls are at 30Hz 125Hz 500Hz 2 000Hz and 10 000Hz Both Left and Right Channels are affected At the center detent or flat position of the controls the tone circuit components are removed from the signal path 21 How to Operate the C48 con t The illustration to the right shows the fundamental frequency range of acoustical musi
12. McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 2699 Phone 607 723 3512 www mcintoshlabs com ma ELIAS Pip The lightning flash with arrowhead within an equilateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s en closure that may be of sufficient magnitude to constitute a risk of electric shock to persons SYN MN BW N e WARNING TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE IMPORTANT SAFETY INSTRUCTIONS PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with a dry cloth Do not block any ventilation openings Install in accordance with the manufacturer s instruc tions Do not install near any heat sources such as radiators heat registers stoves or other appa ratus including amplifiers that produce heat Do not defeat the safety purpose of the polar ized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a 10 11 19 13 14 CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN A A AV S RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED
13. OUTPUT2 4 MENU Push buttons together with the VOL UME ADJUST Control The Remote Control TRIM Push Button together with the LEVEL Push button may also be used Refer to figures 50 and 53 BALANCE Listening balance varies with different program sources room acoustics and listening positions relative to the Loud speakers Use the Balance Trim Function as needed to achieve approximately equal listening volume levels in each Loudspeaker To adjust the Bal CD2 TUNER AUX DVD SERVER MM MC REC MON r072 Y Mcintosh Figure 53 How to Operate the C48 ance perform the following 1 Press the TRIM Push button repeatedly on the Remote Control until BALANCE 0 dB appears on the Front Panel Information Display Refer to figure 54 Note The Front Panel TRIM Push button together with the OUTPUT 1 OUTPUT 2 4 MENU Push buttons may also be used 2 Rotate the VOLUME ADJUST Control or press the LEVEL Push buttons on the Remote Control to emphasize the Right Channel refer to figure 55 or the Left Channel refer to figure 56 Figure 56 The Front Panel Display indicates the Balance changes in steps from O to 50dB After approximately 4 seconds the Information Display returns to indicate the Source Selection and Volume Level To verify the Balance setting without changing it use the TRIM Push button and select Balance TRIM LEVEL The Trim Level adjustments allow for m
14. RUMPET AT FRENCH HORN INF NN TENOR TROMBONE BRASS IA BASS TROMBONEINF IT TUBA E SMALL EEE MEDIUM KETTLE DRUMS En LARGE m e HARP GUITAR VIOLIN T STRINGS CELLO BASS O PIANO my H Ill E numa Figure 73 USB Input Operation with a Computer The C48 USB D A Input provides the capability to playback music from a computer when the computer 1s connected to the rear panel USB D A connector The C48 USB Input is compatible with both PC Computers using Microsoft Windows XP with Service Pack 3 Vista with Service Pack 1 and Windows 7 and the Apple Macintosh Computers using OS X with the latest update McIntosh has verified proper playback operation using Windows Media Player version 11 and Tunes version 10 When a disc in the computer is playing back the PLAY PAUSE H NEXT TRACK BACK TRACK M4 and Stop E Push buttons on the McIntosh HRO72 will control playback of the disc Note When computer application programs and vari ous computer hardware components conform to the Microsoft Windows and Apple Macintosh standards they should also work well when used in conjunction with the C48 USB Input If you are experiencing difficulty with a specific computer hardware component or computer application program contact the manufacturer of the prod uct The C48 Preamplifier Front Panel Information Display will indicate the Bit and Sampling Rate of the incoming digital signal Refer to figure 74
15. T 2 MENU P Push button until the Setup Menu item SETUP TRIGI OUTPUT Ac tion MAIN appears on the Front Panel Informa 5 Rotate the VOLUME ADJUST Control until Ac tion SOURCE appears Refer to figure 17 Figure 17 6 Then press the OUTPUT 2 MENU gt Push button until the Setup Menu item SETUP TRIGI OUTPUT Source OFF appears on the Front Panel Information Display Refer to figure 18 Note By default all the Source Inputs are set to Off 7 Rotate the INPUT Control to select the Tuner as the source Refer to figure 18 pe hy juin CT E m BE EHEHE B q e p oon on E Bam Fou E Figure 15 2 Rotate the VOLUME ADJUST Control until Ac tion REMOTE appears Refer to figure 16 Figure 16 3 Press the EQ BY PASS SETUP Push button to exit the Setup Mode The second example will use selection of the Tuner Input to switch the Trigger 1 Output On 4 Press and hold the EQ BY PASS SETUP Push button until the Setup Mode is active Then press the OUTPUT 2 MENU P Push button until the Setup Menu item SETUP TRIG1 Output Ac tion MAIN appears on the Front Panel Informa tion Display Refer to figure 15 8 Rotate the VOLUME ADJUST Control until Source Tuner ON appears Refer to figure 19 9 Press the EQ BYPASS SETUP Push button to exit the Setup Mode Setup con t Comm Port Baud Rate The C48 may be remotely controlle
16. UT Control until SRVR RCA appears on the Front Panel Information Display Refer to figure 7 Figure 7 14 5 Rotate the VOLUME ADJUST Control until SRVR DIGITAL 1 appears on the Front Panel Information Display Refer to figure 8 Record E O u a mu mt i i ieee jm nuno on a k on funn Ll Ll Figure 8 any changes made to the various inputs from the default settings in the Input and Power Control Settings chart for future reference 6 To exit from the Setup Mode press the EQ BY PASS SETUP Push button Input Level Adjustment Source Components can have slightly different volume levels resulting in the need to readjust the C48 Volume Control when switching between different sources The C48 allows the adjustment of levels for each of the Source Inputs for the same relative volume The CD and SERVER Inputs are used in the following example Note The range of adjustment is 6dB The signal Level present at the RECORD OUT Jacks is unaffected by any changes in the Setup Level adjustment The level adjustments made are retained in permanent memory They can be changed during operation of the C48 by performing a Trim Level Procedure refer to page 19 for additional information 1 Rotate the INPUT Control to select the CD Input and adjust the VOLUME Control to the desired listening level 2 Press and hold the EQ BYPASS SETUP Push button until the Setup Mode 1s active Then p
17. a e Eq ce Uy Meintosh fo o O 6 1 15 16 C48 AUDIO PREAMPLIFIER mema omw mar E 4 92em Installation Installation EFE EEEF FFD E TTT EEE PPS The C48 can be placed upright on a table or shelf standing on its four feet It also can be custom in stalled in a piece of furniture or cabinet of your choice The four feet may be removed from the bottom of the C48 when it is custom installed as outlined be low The four feet together with the mounting screws should be retained for possible future use if the C48 is removed from the custom installation and used free standing The required panel cutout ventilation cutout and unit dimensions are shown Always provide adequate ventilation for your C48 Cool operation ensures the longest possible operating life for any electronic instrument Do not install the C48 directly above a heat generating component such as a high powered amplifier If all the components are installed in a single cabinet a quiet running ventila tion fan can be a definite asset in maintaining all the system components at the coolest possible operating temperature A custom cabinet installation should provide the following minimum spacing dimensions for cool operation Allow at least 2 inches 5 08cm above the top 2 inches 5 08cm below the bottom and 1 inch 2 54cm on each side of the Preamplifier so that airflow is not obstructed Allow 20 inches
18. aking fine adjustments to the previously performed Trim Level Adjustments refer to the Setup Section of this Own er s Manual on page 14 for additional information To make a fine adjustment to the currently selected Input Source perform the following 1 Select TRIM LEVEL as indicated on the Front Panel Information Display Refer to figures 50 53 and 57 Figure 57 2 Adjust the Trim Level to 2 5dB Refer to figure S8 Figure 58 After approximately 4 seconds the Information Display returns to indicate the Source Selection and Volume Level METER ILLUMINATION The Front Panel Meter Illumination of recent McIn tosh Power Amplifiers may be switched On or Off by performing the following 1 Select AMP METER BACKLIGHT Lights On as indicated on the Front Panel Information Dis play Refer to figures 50 53 and 59 HMF METER GHLELIGHT spt Im Figure 59 2 Switch On or Off the Amplifier Meter Illumina tion Refer to figure 60 AMP METER BACKLIGHT Lisie LE Figure 60 After approximately 4 seconds the Information Display returns to indicate the Source Selection and Volume Level EQUALIZER MODE The built in five band Frequency Equalizer provides more precise adjustment of sound than Bass and Treble Controls By default the Equalizer is active for all Input Sources however any Input Source may be assigned to bypass the Equalizer To bypass the Equal izer for a given Input Source
19. and any other brands that may be part of your system If you or your Dealer wish additional help concerning a suspected problem you can receive technical assistance for all McIntosh products at McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 Phone 607 723 3512 Fax 607 724 0549 Customer Service If it is determined that your McIntosh product is in need of repair you can return it to your Dealer You can also return it to the McIntosh Laboratory Service Department For assistance on factory repair return procedure contact the McIntosh Service Department at McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 Phone 607 723 3515 Fax 607 723 1917 Table of Contents Sale IS CG IIIS een 2 Thank You and Please Take a Moment 3 Technical Assistance and Customer Service 3 Table of Contents acetates reese nenne 3 General Information pessasipeaszassssutesitrabecssmes een 4 Connector and Cable Information 4 OC UIC TIO arnet enter 5 Performance Features sahne 5 Di A A 6 PASCAL 15 6 0 RE ERNEUERT EHEN NIIHERUEER I Connections Rear Panel Connect 8 Separa SEE CL ee Mc2B Connecting Om PONG IS ee 9 Connection Diagrams Separate SHCE S seminais Mc1A Mc1B and Mc2A Remote Control Remote Control Push buttons 10 How to use the Remote Control cc occcnnnnccnnn c 11 F
20. ariable Rate Volume and Balance Controls The C48 Preamplifier s Volume and Balance Control Circuitry provides an ideal rate of change with control rotation e Equalizer Controls with Bypass The Equalizer Circuitry provides 12dB of boost or cut at five different center frequencies When an Equal izer Control is in the center position all Circuit Com ponents are removed from the Signal Path The C48 remembers the Equalizer Circuitry Bypass Option for each input e Pass Thru Mode The Automatic Pass Thru Mode allows the C48 to be come part of a Multichannel Sound System for DVD Audio SACD and Home Theater Movies e Alphanumeric Fluorescent Display The Front Panel Information Display indicates the Source Selection Volume Balance Levels and Setup Mode Selections The display intensity 1s adjustable e Remote Control with External Sensor Input The Remote Control provides control of the C48 operating functions and McIntosh Source Components connected to it Enjoy your McIntosh System from another room in your home by connecting an external sensor e Power Control Output and Trigger Assignment A Power Control connection for convenient Turn On of McIntosh Power Amplifiers Source Components and Accessories is included The Power Control Trig ger Ouputs may be assigned to activate when a given Input is selected e Special Power Supply Fully regulated Power Supplies and a special R Core Power Transformer ensure stable noise
21. c integrated circuits drive Electromag netic Switches on all Inputs and operating functions for reliable noiseless distortion free switching All eight Inputs on the C48 can be matched in level so there are no abrupt changes in volume levels between the different Inputs e Moving Coil and Moving Magnet Phono Inputs The C48 contains two different precision Phono Pre amplifier Circuits One for low output Moving Coil Phono Cartridges with selectable resistance loading the other 1s for Moving Magnet Cartridges with select able capacitive loading Both circuits use the latest designs to provide the lowest possible noise and dis tortion The RIAA Correction Equalization Circuitry utilizes close tolerance resistors and capacitors for an extremely flat frequency response e Digital Audio Inputs The C48 has Coaxial Optical and USB Digital Inputs to Decode PCM Signals from an external source The C48 Up Samples the Digital Signal to 192kHz with 32Bit resolution before the Digital to Analog process begins The USB Input sends basic commands e g Play Pause Next Back etc to the computer by using the C48 Remote Control e Balanced Inputs The Balanced Inputs allow the connection of a source component using long cable lengths without a loss in sound quality e Precision Tracking Volume Control Volume levels are controlled by a new Multi Stage Precision Digitally Controlled Attenuator System with a tracking accuracy of 0 1dB e V
22. cal instruments and the human voice It also shows the range of adjustment of frequencies for each of the Equalizer Controls of the C48 at the 6dB and 6dB points Passthru When the C48 1s connected together with a McIntosh Multichannel A V Control Center or Surround Decod er and has the PASSTHRU MODE activated 1t will automatically turn on when the A V Control Center or Surround Decoder 1s turned On It will indicate on the Front Panel Alphanumeric Display PASSTHRU Refer to figure 71 Figure 71 The C48 OUTPUT 1 OUTPUT 2 Front Panel Push buttons are active when in the Passthru Mode The other Front Panel Controls and Push buttons are deac tivated as long as the Passthru Mode is active Optical and Digital Inputs When a Digital Input Optical or Coxial Connection on the C48 is selected the Front Panel Information Display will indicate when a signal is present 2CH PCM Refer to figure 72 During the time there 1s no SOURCE CD EU u pm a a Fa al AT PL alas uma 5 E Figure 72 Digital Signal present the display will indicate SI LENT Refer to figure 73 22 Fundamental Te ie of Acoustical Musical Stent and the Human Voice SOPRANO III CONTRALTO II TENOR SINGING VOICE E BARITONE EEE ASS JM PICCOLO E FLUTE CA OBOE A ENGLISH HORN PIT amp CLARINET WOODWINDS A BASS CLARINET E ALTO SAXOPHONE IN B E BASSOON E CONTRABASSOON A EE B T
23. conversion of the C48 is not pos sible The C48 is factory configured for one of the following AC Voltages 100 Volts 50 60Hz at 30 watts 110 Volts 50 60Hz at 30 watts 120 Volts 50 60Hz at 30 watts 220 Volts 50 60Hz at 30 watts 230 Volts 50 60Hz at 30 watts 240 Volts 50 60Hz at 30 watts Standby Power less than 0 5 watts Note Refer to the rear panel of the C48 for the correct voltage Overall Dimensions Width is 17 1 2 inches 44 45cm Height 1s 6 inches 15 24cm including feet Depth is 18 inches 45 72cm including the Front Panel Knobs and Cables Weight 26 5 pounds 12 0 kg net 41 pounds 18 6 kg in ship ping carton Shipping Carton Dimensions Width is 27 inches 68 6cm Height is 12 inches 30 5cm Depth is 25 inches 63 5cm Packing Instructions SS SgZS GCGCGCGCM G g G S AAA AAA AAA Packing Instructions EE egco zTer a In the event it is necessary to repack the equipment for Quantity Part Number Description shipment the equipment must be packed exactly as l 033838 Shipping carton only shown below It is very important that the four plas 4 033837 End cap tic feet are attached to the bottom of the equipment This will ensure the proper equipment location on the l 033836 Inside carton only bottom pad Failure to do this will result in shipping l 033725 Inner carton top pad damage l 034301 Bottom pad Use the original shipping carton and interior parts 2 034446 Foam plug
24. d from other equipment connected to the Rear Panel RS232C con nector The speed at which the C48 communicates 8 bit no parity and 1 stop bit with other equipment 1s adjustable from 9 600 bits per second to 115 200 bits per second To change from the default speed of 115 200 bits per second perform the following steps 1 Press and hold the EQ BYPASS SETUP Push button until the Setup Mode is active Then press the OUTPUT 2 MENU P Push button until the Setup Menu item SETUP COMM PORT BAUD RATE 115200 appears on the Front Panel Infor mation Display Refer to figure 20 Figure 20 2 Rotate the VOLUME ADJUST Control to select the desired speed 3 Press the EQ BYPASS SETUP Push button to exit the Setup Mode Remote Control Codes EEE EPA DE AA AE DAA A AP AAA The Remote Control included with the C48 utilizes the NOR Mal McIntosh Control Codes The Second Set of Control Codes the C48 will respond to 1s referred to as the ALTernate Codes The ALTernate Codes are used when the C48 1s used in the same location as another McIntosh Preamplifier and or A V Control Center This will prevent the Remote Control from affecting the operation of both units at the same time To acti vate the Remote Control ALTernate Codes perform the following steps 1 Press and hold the EQ BYPASS SETUP Push button until the Setup Mode 1s active Then press the OUTPUT 2 MENU P Push button until the Setup Menu item SETUP REMOTE CODES NORM
25. er accessory component Mo IR Sensor receives commands from a Remote Control Connection for low impedance dynamic headphones for private listening INPUT Control al lows the selection of various sources for listening and record Ing INPUT O HEADPHONES MONO with indicator combines the Left and Right Channel signals for Monophonic Sound 12 EQualizer BY PASS Push button with indica tor when activated the audio signal bypasses the Equalizer Controls also used to enter and exit the Setup Mode Front Panel Displays Controls Push buttons and Jack EQUALIZER Controls increase or decrease the volume levels at the Center Frequencies of 30Hz 125Hz 500Hz 2 000Hz and 10 000Hz Melntosh C48 AUDIO PREAMPLIFIER TRIM Push button with indicator allows selection of various types of settings INFORMATION DISPLAY indicates the Sources Vol ume other Audio Settings Operational Functions and Setup Mode Settings VOLUME Control allows adjustment of the listening level for both channels VOLUME ADJUST STANDBY ON Push button with indicator switches RR the C48 ON or OFF Standby and resets the microprocessors MUTE Push button mutes the audio from the Loudspeakers and Headphones OUTPUT 1 and 2 Push buttons with indicators switch the Preamplifier Outputs l and 2 On or Off Setup How to Operate the Setup Mode ESSES SS A A SE ESSES Your McIntosh C48 has been
26. factory configured for default operating settings that will allow immediate enjoyment of superb audio without the need for fur ther adjustments If you wish to make changes to the factory default settings a Setup Feature 1s provided to customize the operating settings using the Front Panel Information Display Refer to the C48 Front Panel Illustration on the previous page while performing the following steps Note If the C48 is currently On proceed to step 2 1 Press the STANDBY ON Push button on the Front Panel or press the Power Push button on the Remote Control to switch On the C48 The C48 will go through a brief startup intialization with the Front Panel Information Display indicating the last used source and volume setting this is fol lowed by the volume setting indication starting at zero and then increasing to the last used volume setting Refer to figure 1 Figure 1 2 Press and hold the EQ BY PASS SETUP Push button until the Front Panel Information Display indicates McIntosh C48 V1 00 1 0 or higher Firmware Refer to figure 2 At this time the LED above the TRIM Push button will be illuminated 3 Press the OUTPUT 2 MENU Push button to select the next Setup Mode Menu item SETUP SORCE INPUT TUNER RCA With each additional press of the OUTPUT 2 MENU gt Push button the Setup Menu will advance to the next Menu Selection Refer to figure 3 ot pmm ae Al elo al LLL Figure 3
27. free operation even though the power line varies e Fiber Optic Solid State Front Panel Illumination The even Illumination of the Front Panel is accom plished by the combination of custom designed Fiber Optic Light Diffusers and extra long life Light Emit ting Diodes LEDs e Glass Front Panel and Super Mirror Chassis Finish The famous McIntosh Illuminated Glass Front Panel and the Stainless Steel Chassis with Super Mirror Finish ensures the pristine beauty of the C48 will be retained for many years 0 Dimensions Dimensions The following dimensions can assist in determining the best location for your C48 There 1s additional information on the next page pertaining to installing the C48 into cabinets Front View of the C48 17 1 2 44 45cm C48 Mentosh _ O 00000 13 69cm 15 24cm pomos Moo css ud un HE NUTE poom e ermosvion OO O ii a Side View of the C48 U J LJ 16 1 2 41 91cm 14 1 2 36 83cm 27 3 16 413 16 Rear View of the C48 0 48cm 42 92em 17 1 8 U 43 50cm 0000000000 13 16 0 16 Er BEX 2 E Es SE SES ER ER 1 0 2 O O O OQ O O 4 5 8 2 06cm E 5 08 REC PHONO POWEI NTROL PORTS ITAL AUDIO INPUTS 11 75cm 26 83cm i om ovr Solos N RS 2320 MAIN OUTPUT TRIG1 coe DIG2 DIG 1 a xo meme do O O O O 09 OE e 6
28. gital signal present when any one of the five digital inputs is se lected perform the following steps 1 Select one of the Inputs assigned to an active digital source Note The USB D A Input may also be selected when the C48 is connected to a computer 2 Select DIGITAL AUDIO Display Info Off as indicated on the Front Panel Information Display Refer to figure 65 Figure 65 3 Set the DIGITAL AUDIO Display Info to On Refer to figure 66 20 Figure 66 After approximately 4 seconds the Information Display will return to indicate the Source Selection Volume Level and the Digital Information Refer to figure 67 SOU RCE DUD on H H pr Pa En a FA FLA Lets Figure 67 PHONO ADJUSTMENTS When the Phono MC or Phono MM Input is selected an additional TRIM SELECT FUNCTION becomes available for adjustment Perform the following steps to make the Phono Trim Adjustments 1 Select either the Phono MM or Phono MC Source Input 2 Select PHONO CARTRIDGE Moving Coil 500 Ohm or PHONO CARTRIDGE Moving Mag net SOpF as indicated on the Front Panel Informa tion Display Refer to figures 68 and 69 pm I I oo L I pr pr ne mi e u mt e pP Pu m o II RR A eje E E un H H Fun nn E H E 7 E 7 a a in Fun Enns E z e a 7 ge H emo Ppt mdb Liri H H a an un a a a a Fun un un Fun E Figure 69 3 Set the desired phono cartridge loading value Ohms fo
29. he C48 IR Input Connector to the external Sensor Audio Connections 13 Connect an Audio Cable from the C48 TUNER INPUT Jacks to the Tuner Fixed Output Jacks 14 Connect an Audio Cable from the C48 CD IN PUT Jacks to the SACD CD Player Fixed Output Jacks 15 Connect an Audio Cable from the C48 SRVR IN PUT Jacks to the Music Server Output Jacks 16 Connect an Audio Cable from the C48 RECORD OUTPUT Jacks to the Music Server Input 3 Jacks 17 Connect the Audio Cables coming from the Turn table to the C48 MC PHONO INPUT Jacks Note If the Turntable has a Moving Magnet Car tridge connect the audio cables to the C48 MM PHONO INPUT instead of the MC Input 18 Connect Balanced Cables from the C48 BALanced OUTPUT 1 connectors to the Power Amplifiers Balanced Left and Right Inputs 19 Optionally Connect an Audio Cable from the C48 BALanced OUTPUT 2 connectors to the Power Amplifier Secondary Inputs 20 Connect any additional McIntosh Components in a similar manner as outlined in steps 14 thru 18 Optional PassThru Connections 21 Connect Balanced Cables from the A V Control Center Front Left and Right Channel Balanced Output connectors to the BALanced 2 Input con nectors Note Refer to Setup PassThru on page 15 to activate the BALanced 2 Input 22 Connect a Control Cable from the C48 PASSTHRU to A V Control Center Zone ZA Power Control Output Optional USB Connection 23 Connect a USB cable with
30. ill not appear in the list of available Inputs for the Passthru Mode 3 When one of the RCA Inputs is selected as a Passthru Input itis advisable to remove it from the list of available Inputs by switching it Off Refer to Source Inputs Reassignment starting on page 13 1 Press and hold the EQ BYPASS SETUP Push button until the Setup Mode 1s active Then press the OUTPUT 2 MENU Push button until the Setup Menu item SETUP PASSTHRU Source OFF appears on the Front Panel Alphanumeric Display Refer to figure 13 m pe pp man Lily Sana i pa AA qa RE EHEHE EEE EEE EEE Figure 13 2 Rotate the VOLUME ADJUST Control until SETUP PASSTHRU Source BALANCED 2 Passthru con t appears on the Front Panel Alphanumeric Display Refer to figure 14 Figure 14 3 Press the EQ BY PASS SETUP Push button to exit the Setup Mode 16 Power Control Triggers 1 and 2 By default the Power Control TRIGger 1 and TRIG ger 2 Outputs function the same as the MAIN Power Control Jack switching On Off with the C48 Trigger l and 2 are also reassignable to activate when the ACC ON OFF Push buttons on the Remote Control are used or when a given Input or Inputs are selected In the first example the Power Control Trigger 1 Output will be set to function via the Remote Control ACC Push buttons 1 Press and hold the EQ BY PASS SETUP Push button until the Setup Mode is active Then press the OUTPU
31. ions Frequency Response 0 0 5dB from 20Hz to 20 000Hz 0 3dB from 15Hz to 100 000Hz Total Harmonic Distortion 0 002 from 20Hz to 20 000Hz Rated Output Main 2 5V Unbalanced 5V Balanced Maximum Voltage Output 8V RMS Unbalanced 16V RMS Balanced Sensitivity for rated output High Level 450mV unbalanced 900mV balanced Phono MM 4 5mV Phono MC 0 45mV Signal To Noise Ratio A Weighted High Level 100dB Phono 88dB Equalizer Controls 150 E Ap 105 ovormu 0omo Z muc4a ruvas 20 50 100 200 500 1k 2k 5k 10k 20k FREQUENCY IN HERTZ 26 Input Impedance High Level 22K ohms unbalanced 44k ohms bal anced Phono MM 47K ohms 50 to 750pF in 50pF steps Phono MC 25 50 100 200 500 or 1 000 ohms 100pF Maximum Input Signal High Level SV Unbalanced 10V Balanced Phono MM 50mV Phono MC 5mV Voltage Gain High Level to Record Output OdB High Level to Main Output 15dB Phono MM to Record Output 40dB Phono MC to Record Output 60dB Output Impedance 220 ohms Headphone Load Impedance 100 ohms to 600 ohms Digital Input Sample Rates Optical 16Bit 24Bit 32kHz to 96kHz Coaxial 16Bit 24Bit 32kHz to 96kHz USB 16Bit 24Bit 32kHz to 192kHz 24Bit 32Bit 32kHz to 96kHz Power Control and Trigger Output DVDC 25mA Specifications Power Requirements Field AC Voltage
32. l sources to Unbalanced Inputs and send signals from the Balanced Outputs You can also use Bal anced and Unbalanced Outputs simultaneously connected to different Power Amplifiers 4 The C48 internal Digital to Analog Converter Circuitry is designed to decode 2 channel PCM Pulse Code Modulation Digital Signal present at the Coaxial and Optical Digital Audio Inputs Other Digital Audio Signal Format Types will cause the Audio Outputs of the C48 to be muted and the Front Panel Information Display will indicate an error message The Remote Control Supplied with the C48 In tegrated Amplifier is capable of operating other components For additional information go to www mcintoshlabs com yd 6 When discarding the unit comply with local rules or regulations Batteries should eS A never be thrown away or incinerated but disposed of in accordance with the local regulations concerning battery disposal General Information and Connector Information 7 For additional information on the C48 and other McIntosh Products please visit the McIntosh Web Site at www mcintoshlabs com Connector and Cable Information XLR Connectors Below 1s the Pin configuration for the XLR Balanced Input and Output Connectors on the C48 Refer to the diagrams for connections PIN 2 PIN 1 PIN 1 PIN 1 Shield Ground PIN 2 Output PIN 3 Output Power Control and Trigger Connectors The C48 Power Control Out Trigger and Pa
33. n the Front Panel Informa tion Display when using the INPUT Control nor is it accessible with the Remote Control 2 The Phono MC Moving Coil and MM Mov ing Magnet Input are designed for connection of a turntable only and thus non reassignable However the Phono Inputs may be switched Off 3 Only one Input may be assigned at a time to a Balanced 1 amp 2 or Digital 1 thru 4 Connec tor If an already assigned Balanced or Digital connector is to be reassigned to a different Input the Input currently assigned to the con nector first needs to be changed It can be set to a RCA connector or to another available Balanced or Digital connector Reassign Source Inputs con t 1 Press and hold the EQ BY PASS SETUP Push button until the Setup Mode 1s active Then press the OUTPUT 2 MENU P Push button to select the Setup Menu item SETUP SOURCE INPUT TUNER RCA Refer to figure 4 Figure 4 2 Rotate the INPUT Control until CD2 RCA appears on the Front Panel Information Display Refer to figure 5 SOURCE 2 Po a A Figure 5 3 Rotate the VOLUME ADJUST Control until CD2 BALANCED 1 appears on the Front Panel In formation Display Refer to figure 6 en E La ml i I a en a I I a a x mn Fun un 7 Fun Danna Figure 6 The second example will illustrate reassigning the SRVR Server Input from SRVR REC Input RCA Jacks to the DIGital 1 Optical Input 4 Rotate the INP
34. o not expose this equipment to dripping or splashing and ensure that no objects filled with liquids such as vases are placed on the equipment To completely disconnect this equipment from the a c mains disconnect the power supply cord plug from the a c receptacle The mains plug of the power supply cord shall remain readily operable Do not expose batteries to excessive heat such as sunshine fire or the like Connect mains power supply cord only to a mains socket outlet with a protective earthing connection Thank You EEE ESP TPPPE PETER Your decision to own this McIntosh C48 Audio Pre amplifier ranks you at the very top among discrimi nating music listeners You now have The Best The McIntosh dedication to Quality is assurance that you will receive many years of musical enjoyment from this unit Please take a short time to read the information in this manual We want you to be as familiar as pos sible with all the features and functions of your new McIntosh Please Take A Moment eee SS SEE nz EE The serial number purchase date and McIntosh Dealer name are important to you for possible insurance claim or future service The spaces below have been provided for you to record that information Serial Number Purchase Date Dealer Name Technical Assistance If at any time you have questions about your McIntosh product contact your McIntosh Dealer who 1s familiar with your McIntosh equipment
35. o switch OFF the C48 press the STANDBY ON Push button on the Front Panel or the OFF Push button on the Remote Control Note For an explanation of the Remote Control Push button functions refer to pages 10 and 11 5 EE TR um e me NU EQ BYPASS TRIM o o e C48 AUDIO PREAMPLIFIER py oi ms a DIE LT EE EE mes COMIC Hm as U o O ei o a un Bonna EB ma al a na fume a E T H Figure 52 Source Selection Rotate the INPUT Control to select the desired source or press the appropriate push button on the Remote Control Refer to figures 50 and 53 Volume Control Rotate the Front Panel VOLUME Control or use the VOLUME UpA or Down Push buttons on the Re mote Control for the desired listening level Refer to figures 50 and 53 Trim Functions The C48 has seven different Trim Selections with Adjustments The Trim Selections include Balance Trim Level Amplifier Meter Backlight Equalizer Mode Mono Stereo Mode Digital Audio Display Info and Phono Cartridge Loading The Trim Settings are VOLUME ADJUST MUTE 1 OUTPUT 2 o Oo Oo 4 menu P gt STANDBY ON Figure 50 18 stored in memory indepen dently for each Input Source Selected except the Ampli fier Illumination and Digital Audio Display settings of On or Off which are the same for all inputs Note Selection and Adjustment of all Trim Functions may be performed using the Front Panel TRIM OUT PUT 1
36. r a Moving Coil Cartridge or Capaci tance for a Moving Magnet Cartridge that comes closest to the Phono Cartridge Makers recom mended value After approximately 4 seconds the Alphanumeric Display returns to indicate the Source Selection and Volume Level Mono Press the Front Panel MONO Push button to change from Stereo to Mono Mode for the currently selected Input Source The LED above the MONO Push button will 1l luminate Refer to figure 50 The C48 remembers for each selected Input whether the Mode is Stereo or Mono To change the Mode from Mono to Stereo for the currently selected Input Source press the MONO Push button Note The audio signal present at the RE CORD OUT Jacks is unaffected by the MONO Push button CD2 TUNER AUX DVD SERVER MM Equalizer Bypass Press the Front Panel EQ BYPASS Push button to remove the C48 Equalizer Circuitry from the signal path for the currently selected Input Source The LED above the EQ BYPASS Push button will illuminate Refer to figure 50 The C48 remembers for each selected Input whether the Equalizer Circuitry is deactivated To re REC MON GD ro72 OD Meintosh Figure 53 How to Operate the C48 con t activate the Equalizer for the currently selected Input Source press the EQ BYPASS Push button Note The audio signal present at the RECORD OUT Jacks is unaffected by the Equalizer Circuitry Trim Press the Front Panel TRIM Push button to activate
37. ress the OUTPUT 2 MENU P Push button until the Setup Menu item LEVEL CD 0 0dB appears on the Front Panel Information Display Refer to figure 9 Figure 9 Note The CD Input is serving as a reference level or choose another source frequently listened to The Input Source should be set to a refer ence Level Trim of 0 0dB Rotate the INPUT Control until LEVEL SRVR 0 0dB appears on the Front Panel Information Display If necessary rotate the VOLUME AD JUST Control to obtain the same volume level as the CD Input by switching between the two Inputs using the INPUT Control 909 Setup con t 4 Rotate the INPUT Control until LEVEL SRVR _ appears on the Front Panel Information Display The illustration in figure 10 indicates a 2 5dB decrease 1n the SRVR Level to match the volume level of the CD Input 5 Repeat step 4 for other Inputs with component sources connected until they all have the same relative volume levels Record any changes made to the various inputs from the default settings in the Input and Power Control Settings chart below 6 To exit from the Setup Mode press the EQ BY PASS SETUP Push button Input and Power Control Settings Connection New Level Tyee mim fa 2 PHONO MM Display Brightness AAA The Front Panel Information Display Brightness may be changed from the default setting There are four brightness settings for the Information Display The Di
38. ront Panel Front Panel Displays Controls Push buttons A AA A A 12 Setup How to Operate the Setup Mode occcccccncncnnnnnnnns 13 Detail Setas rd 13 A 13 Source Inputs ReasstOnment susanne 13 Input Level Adjustment unse 14 Display Brightness essen 15 A ee ee 15 Power Control Triggers 1 and 2 16 Comm Port Baud Rates 17 Remote Control Codes sesion 17 Operation How to Operate the CAS encia lisas 18 Trimi FUNCHONS nidad 18 20 Equalizer By DAS sueno aS 2 Pgualizer Contos usen 22 PPS SUE Ir ee 22 Optical and Dis dl ips lt a 23 USB Input Operation with a Computer 23 Additional Information POLOS een nee R 24 25 o een 26 Packing Instruction aussen ee 27 Copyright 2010 by McIntosh Laboratory Inc General Information 1 For additional connection information refer to the owner s manual s for any component s connected to the C48 Audio Preamplifier 2 The Main AC Power going to the C48 and any other McIntosh Component s should not be applied until all the system components are connected together Failure to do so could result in malfunc tioning of some or all of the system s normal opera tions When the C48 and other McIntosh Compo nents are 1n their Standby Power Off Mode the Microprocessor s Circuitry inside each component 1s active and communication is occurring between them Balanced and Unbalanced Inputs and Outputs can be mixed For example you may connect signa
39. s on a variety of McIntosh Components Press TRIM and then the LEVEL Push buttons to select and adjust various functions Selects FM Tuner Operating Func tions and Track Selection on certain McIntosh CD Players Use to select tuner presets disc tracks or any numbered operation Scrolls through the available C48 Inputs Selects one of the eight available Audio Sources Note Push buttons whose function is not identified above are for use with other McIntosh Products How to use the Remote Control How to use the Remote Control The supplied HR072 Remote Control 1s capable of directly controlling the functions of contemporary Source Components connected to the C48 via the Data Ports Note Ifat any time the C48 seems unresponsive to HR072 Remote Control Commands press the M Push button first Input Source Selection Press the appropriate Source Push button to select the desired program source Note When the C50 is Off pressing one of the Source Push buttons will switch the C50 On and will go to that Input Mute Press the MUTE Push button to mute the audio 1n all outputs except the REC OUTPUT The word MUTE will appear on the Front Panel Information Display To un mute the audio press the MUTE Push button again Disc Server and Tape Functions Use these push buttons to operate a DVD Player CD Player CD Changer Music Server or Recorder Numbered Push buttons Press Push buttons 0 through 9 to access tuner sta
40. splay Brightness setting may be varied 1 Dim to 4 Bright Follow the steps below for reducing the Display Brightness 1 Press and hold the EQ BYPASS SETUP Push button until the Setup Mode 1s active Then press the OUTPUT 2 MENU P Push button until the Setup Menu item SETUP DISPLAY appears on the Front Panel Information Display Refer to figure 11 Figure 11 2 Rotate the VOLUME ADJUST Control until BRIGHTNESS 1 appears on the Front Panel Information Display Refer to figure 12 pa b rm Sagn Ea Figure 12 3 To exit from the Setup Mode press the EQ BY PASS SETUP Push button Passthru The C48 can be part of a Multichannel Sound System for SACD DVD Audio and Home Theater The Right and Left Front Channels from an Audio Video Control Center or Surround Decoder can Passthru the C48 and onto its associated Power Amplifier s The Setup Mode allows the activation of the Passthru Mode and the selection of the specified C48 Input Connector to be used for the Right and Left Front Channels In the example below the Right and Left Front Channels from the Audio Video Control Center will be connect ed to the BALanced 2 Input Connectors on the C48 Refer to page 9 for additional connection information Notes 1 The Phono Input Connectors and Digital Input Connectors are not assignable as a Passthru Input 2 If Balanced Input Connectors 1 and or 2 are already reassigned to a given Input they w
41. ss Thru Output Jacks send Power On Output 1 amp 2 Trig 1 amp 2 Off Signals 12 volt 0 volt a U when connected to other Base Pd McIntosh Components An Control additional connection is for Meter controlling the illumination of on Control Ground the Power Output Meters on McIntosh Power Amplifiers A 1 8 inch stereo mini phone plug is used for connection to the Power Control Trigger and Pass Thru Outputs on the C48 Note The Power Control Trigger Pass Thru and Data Connecting Cable is available from the McIntosh Parts Department Power Control Trigger Pass Thru and Data Cable Part No 170 202 Six foot shielded 2 conductor with 1 8 inch stereo mini phone plugs on each end Data Port Connectors The C48 Data Out Ports send Remote Control Signals to Source Components A 1 8 inch stereo mini phone plug is Data 7 used for connection eae N C Data Ground Introduction and Performance Features Introduction DE The McIntosh C48 Audio Preamplifier 1s one of the finest Preamplifiers ever created The versatile Pream plifier provides connections for various input sources both analog and digital The C48 Outputs have the ability to drive multiple Power Amplifiers The C48 reproduction 1s sonically transparent and absolutely accurate The McIntosh Sound is The Sound of the Music Itself Performance Features AAA A A A A A A m e Electromagentic Input Switching with Level Trim Adjustment Digital Logi
42. the C48 Trim Functions Use the Front Panel OUT PUT 1 OUTPUT 2 4 MENU gt Push buttons to select the desired Trim Fuction and then use the VOLUME ADJUST Control to vary or make changes Refer to figure 50 The Remote Control TRIM and LEVEL Push buttons may also be used The LED above the TRIM Push button will illuminate during Trim selection and adjustment Approximately four seconds after Trim Function Selection and or adjust ments have stopped the C48 will switch off the Trim Mode Mute Press the MUTE Push button on the C48 Front Panel or on the Remote Control to Mute the Audio in all McIntosh C48 AUDIO PREAMPLIFIER EQ BYPASS TRIM O O O outputs Main Output 1 Output 2 and Headphones except the REC OUTPUT The Front Panel Informa tion Display will indicate the Source Name and the word MUTE in place of the actual volume setting Refer to figure 70 Pressing the Mute Push button a second time or adjusting the volume control either the Front Panel or Remote Control will un mute the C48 Output 1 and 2 Press the Front Panel OUTPUT 1 OUTPUT 2 Push button or use the Remote Control and press the SETUP BLUE Push button followed by the OUTPUT 1 OUTPUT 2 Push button to send audio to sepa rate Power Amplifiers connected to the rear panel OUTPUT 1 or 2 Jacks It also activates the POWER CONTROL OUTPUT 1 OUTPUT 2 Jacks on the rear panel of the C48 To stop the Audio and Power Control VOLUME MUT
43. tivate them on page 15 Power Control Connections 1 Connect a Control Cable from the C48 POWER CONTROL MAIN Jack to the Power Control In on the Turntable 2 Connect a Control Cable from the Turntable Power Control Out Jack to the SACD CD Player Power Control In Jack 3 Connect a Control Cable from the SACD CD Player Power Control Out Jack to the Tuner Power Control In Jack 4 Connect a Control Cable from the Tuner Power Control Out Jack to the Music Server Power Con trol In Jack 5 Connect a Control Cable from the C48 POWER CONTROL OUTPUT 1 Jack to the Power Ampli fier Power Control In Jack Note If two Power Amplifiers are used connect the Power Control Output of the first Amplifier to the Power Control Input on the second Ampli fier 6 Optionally connect a Control Cable from the C48 POWER CONTROL OUTPUT 2 Jack to the Power Amplifier Secondary Room Power Control In Jack 7 Connect any additional Components 1n a similar manner as outlined in steps 1 thru 4 Data Control Connections 8 Connect a Control Cable from the C48 TUNER DATA PORTS Jack to the TUNER Data In Jack 9 Connect a Control Cable from the C48 CD DATA PORT Jack to the SACD CD Player Data In Jack 10 Connect a Control Cable from the C48 SRVR DATA PORT Jack to the Music Server Data In Jack 11 Connect any additional McIntosh Components in a similar manner as outlined in steps 8 thru 10 Sensor Connection 12 Connect a Control Cable from t
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