Plinius Audio SA-250 User's Manual
Contents
1. ALL MONO BRIDGE OPTIONS USE RIGHT INPUT AND LEFT RIGHT OUTPUTS ONLY AMIPLIFIER CONFIGURATION SELECTOR REFER OVVNER S MANUAL FOR TECHNICAL DESCRIPTIONS AMPLIFIER CONFIGURATION SELECTOR The ACS switch options are RCA STEREO This option provides a stereo output via both left and right output channels from a stereo signal connected to both left and right input RCA inputs RCA BRIDGED This option configures your amplifier to drive one loudspeaker from one unbalanced signal fed to the RIGHT RCA input The loudspeaker is connected to both channels positive output terminals giving an available power in this mode four times the rated output of the amplifier approximately 900 watts into 8 ohms Special care must be taken in connecting the input signal and loudspeakers to ensure safe operation and best possible performance XLR STEREO This option provides a stereo output signal from a balanced stereo input signal connected to both the left and right XLR inputs All the advantages of balanced line transmission will be realised with good rejection of noise and some freedom from earth or ground loops hum XLR BALANCED MONO In this mode both channels of your Plinius SA 250 combine to operate as a true balanced mono amplifier from input to output This configuration provides the highest quality mono performance from a balanced line input connected to the RIGHT BALANCED XLR INPUT As with RCA Bridged configuratio2. PLINIUS SA 250 Class A Power Amplifier INSTRUCTION MANUAL REFINED AUDIO EQUIPMENT MANUFACTURED WITH PRIDE IN NEW ZEALAND CONGRATULATIONS on your decision to become the proud owner of this Plinius SA 250 Power Amplifier his manual has been prepared to help you understand the operation of your amplifier and to provide information about its design and the variety of ways it may be used We have designed and manufactured this amplifier to reproduce faithfully and accurately your favourite music With a little care and a full understanding of the operating recommendations in this manual your Plinius SA 250 Power Amplifier will provide years of high quality trouble free performance Serial Number Date of Manufacture Final Test Cerniiod BY IMPORTANT PLEASE TAKE THE TIME TO READ THIS MANUAL THOROUGHLY BEFORE USING YOUR AMPLIFIER CONTENTS MN OMA TIO Mise se a e AM iiM AL Page 3 o NE Page 5 Idle Sed ON IPAE Page 6 ADDIT Pedir Ss EAT PANEL Page 8 Amplitier Configuration Selector ACS ptu abt ote oet he t dicetis Page 9 Unbalanced cedat acad tee atc Page 10 dard D STO se Sixes stemmate Page 12 OUT UT CONNECTION RE EU Page 13 ONE I T T scene cba ett ated Page 14 KERE OMIM tesa TEE 15 OE CHEM IOS Rene ae
3. MAINS INPUT AND GROUND LIFT INPUT TERMINALS Input terminals for your Plinius SA 250 Power Amplifier are easily accessible and fitted to the top centre area of the rear panel A brief summary of connection possibilities is listed below while a more detailed explanation follows later in this instruction manual RCA INPUTS LEFT amp RIGHT These standard RCA terminals are for use with unbalanced signals from most signal sources such as audio preamplifiers XLR BALANCED INPUTS LEFT amp RIGHT XLR connectors fitted to this amplifier are for use with balanced line signals from audio preamplifiers Balanced signals are carried via a three way cable that connects all three pins at each end of the interconnect cable AMPLIFIER CONFIGURATION SELECTOR ACS The Amplifier Configuration Selector ACS is a unique switching method that exploits all of the operational features of your Plinius SA 250 Power Amplifier By using this switch it is possible to operate your amplifier with either balanced or unbalanced signals and achieve a stereo or mono output otereo or Mono use of this amplifier will depend on the type of ancillary equipment employed with your system lf you wish to use this amplifier as a single channel mono Power Amplifier in a stereo high fidelity system then another SA 250 will be required for the other channel This will provide an extremely high performance option STEREO BALANCED MONO RCA BRIDGED MONO STEREO
4. SECTION OF SA 250 MAINBOARD SHOWING POSITION OF ECOLOGIC JUMPERS AND LED BRIGHTNESS ADJUSTMENT POTENTIOMETER MAINS LINE FUSE A Mains Line fuse is fitted within the IEC Mains Line socket on the rear of the amplifier A small drawer at the bottom of this socket may be removed after the IEC plug is removed by levering it out with a flat blade screwdriver The fuse fitted should be rated at no greater than 20 amps normal blow In the unusual event that this fuse should blow you must first establish the cause of this failure Such as power surges damaged mains cable etc before replacing the fuse with one of the same rating and type IMPORTANT DO NOT FIT A FUSE WITH A HIGHER RATING LOUDSPEAKER SELECTION Your Plinius SA 250 Power Amplifier is designed for use with high fidelity loudspeakers It should not be used to operate any other type of appliance or equipment Choice of loudspeakers is one of personal taste providing the chosen loudspeakers are suitable for use with your amplifier Be certain that your loudspeakers can handle most of the rated output power of this amplifier You may find loudspeaker specifications confusing or misleading so you should discuss this with your audio dealer prior to purchase As a general rule the use of high power 200 watt RMS or greater loudspeakers is recommended and desirable However our experience indicates that medium to low power loudspeakers 100 to 200 watt RMS are quite often suitable for use
5. advice AMPLIFIER FEATURES REAR PANEL his panel incorporates all the terminals for connecting the input signals from your preamplifier and output to the loudspeakers and mains supply A reasonable understanding of this amplifier and a logical approach should ensure that you are listening to this amplifier without any difficulties at all Please remember that your Plinius SA 250 Power Amplifier is a high quality electronic instrument capable of an exceptional level of performance Be sure that you understand your system s requirements fully before you make any connection to this amplifier or adjust the ACS Amplifier Configuration Selector RIGHT INPUTS LEFT INPUTS 2 RCA STEREO XL HR BALANCED RIGHT OUTPUTS RCA BRIDGED MONO XLR STEREO LEFT OUTPUTS AMPLIFIER CONFIGURATION SELECTOR REFER TO OWNERS MANUAL FOR USAGE INSTRUCTIONS CAUTION ENSURE ADEQUATE VENTILATION PLINIUS 250 MkIV DESIGNED AND MANUFACTURED IN STEREO POVVER AMPLIFIER NEW ZEALAND BY AUDIBLE TECHNOLOGIES LTD SERIAL No VOLTAGE BOX 0 PALMERSTON NORTH CAUTION TO REDUCE RISK OF CQALITI ON ELECTRIC SHOCK DO NOT REMOVE MAINS FU PLACE FeoAL CHASSIS 4 lt 46 REAR PANEL THE PLINIUS 54 250 SHOWING ALL THE AVAILABLE FACILITIES INCLUDING INPUT AND OUTPUT TERMINALS ACS AMPLIFIER CONFIGURATION SELECTOR
6. monitors and performs the Bias and Mute functions It is programmed to switch the amplifier back into Class AB if no signal has been present at the input for a predetermined time This time can be adjusted to Off 15 30 or 60 minutes During the last minute without signal the bias LED will pulse to indicate the unit is about to return to Class AB The purpose of this function is to prevent the amplifier being left in Class A while unattended for a period of time To adjust this time constant the amplifier lid must be removed and the small jumper JP4 located on the main circuit board at the front left shifted to the appropriately labelled pins Please ensure that your amplifier is switched OFF and disconnected from the mains supply before this adjustment is made The factory setting is 30 minutes LED BRIGHTNESS CONTROL Your Plinius SA 250 has an internal LED brightness control that will adjust all three front panel LED s A small flat bladed screwdriver can be used to adjust the brightness The LED brightness control is a small multi turn potentiometer and is located on the front of the main circuit board within the top cavity of the amplifier and is labelled VR5 Make sure you adjust the correct potentiometer and remember to remove the mains supply from the amplifier before making any adjustments TOWARDS FRONT OF AMPLIFIER 4 _ i e i c gt lt JP5 CN3 Test Ecologic Jumper JP4 Fuse LEDs Error LED LED Adjuster VR5
7. on this amplifier provided the volume is maintained at a level where no distortion is audible Impedance of the loudspeaker load is important to ensure the rated performance of this amplifier Any combination of loudspeakers may be used but the total average impedance load for each channel should be within a range of 4 to 8 ohms Again if you have doubts about the impedance of your loudspeaker configuration we recommend you speak to your PLINIUS dealer WHY CLASS A Is BETTER Class A has always been regarded as the perfect operating mode for audio amplifiers Many leading amplifier designers and manufacturers world wide recognise that a well designed Class A circuit has inherently lower distortion than any other design Class A circuit topology is one in which the total current the amplifier is capable of delivering is kept flowing in the circuit regardless of demand In a conventional or Class AB amplifier circuit this current flow varies when demand varies Furthermore as current varies the voltage on the rails as seen by the output stage varies too Class A circuit current draw should be constant therefore there is an absence of the power supply modulation common in Class AB design amplifiers Pinpoint images tonal clarification intertransient silence more readily defined dynamic shadings inner detail and authority are all inherent advantages of good Class A design 20 SPECIFICATIONS 250 WATTS RMS PER CHANNEL INTO 8 OHMS
8. 450 WATTS RMS PER CHANNEL INTO 4 OHMS BOTH CHANNELS DRIVEN FROM 20Hz TO 20kHz AT 0 05 TOTAL HARMONIC DISTORTION BRIDGED OUTPUT 900 Watts RMS 20Hz to 20kHz into 8 ohms Mono DYNAMIC HEADROOM 1dB or greater at 8 ohms with music FREQUENCY RESPONSE 20Hz to 20kHz 0 2dB OdB at OHz and 3dB at 70 2 DISTORTION Typically 0 0596 THD at rated power 0 1 THD and IM worst case prior to clipping SATURATION 300 Watts per channel or greater into 80 VOLTAGE SWING 130V per channel CURRENT OUTPUT 70A short duration peak per channel Fuse protected RISE TIME Typically Sus PHASE RESPONSE 4 0 at 20Hz and 14 at 20kHz amp NoisE 1009 below rated output 20Hz to 20kHz A weighted NPUT SENSITIVITY 1 2V RMS for rated output at 1 2 IMPEDANCE 47kQ2 HEIGHT 275mm 10 3 4 WIDTH 510mm 20 DEPTH 535mm 21 WEIGHT 57kg 125lbs 21 ACS Configuration SC LEC ION aiios dui deiade pedem teda nas diat a Page 9 10 Pages 7 20 SIS _ _ ____ 7 eie SATIRE ER Page sj Uno m aed Page 15 BUST IV AUT TG RERO RE Page 3 BOG Go QEON RR ___ _ _____ 6__ 6____ Page 1 I creche ct get etic thee sem cass Gedy Page 1 Odile a MUA E E
9. NR Page 6 seu ones ATE Page 17 iren amp WMG REIN IT NT Page 11 OTRO uses site Pages 11 12 9 14 15 MOMS S CONVO a 18 Loud PEAKE IDEO B Page 19 LOUISDE PONET cies a AMI DI D PEDE SUD LUE Page 19 MIETEN RET Tt mem Page 18 Mains OTRO OT sexs entire deii dte Pages 12 16 RP PERDE Page 6 MONO OD TAON og dde uM update he eb ere eter CAE MIL rae Pages 10 14 15 MUNDI eA UM UE M MS EE MM E Page 6 Sors PUIG ne FIN et iB ERU Pages 5 12 a Pages 10 14 15 Moris Xc Page 16 m pce IMEEM MD MUI LM SM RN M Pages 5 12 AAMS e EHE D M hit DE MEN IE DM REN D DUM EE Page 17 RCA Bridged Mono INpUt Pages 10 14 E E E RD Pages 9 14 peg MU MM C MM MN LAM E Page 8 DDR DORT Page 5 SEDIT O Eoo cu du MM EM UNDE D MM ELM Page 3 SIBI ED S EL cens e p E tuc EE UD MD du ADEM DE Pages 10 14 15 QE RSEN TT em Page 15 retentu DTE Md eL DADA Page 10 Ventilation PRORA Pages 5 12 ALR Balanceo Mono DUE aca tte te Pages 10 15 EMEN E 10 14 22 CONTACT DETAILS All operational technical and descriptive material published here is subject to change at a
10. SECTION INPUT OUTPUT CONNECTION RIGHT INPUTS RCA STEREO RIGHT OUTPUTS RCA BRIDGED MONO AMPLIFIER CONFIGURATION SELECTOR REFER OWNERS MANUAL FOR USAGE INSTRUCTIONS LEFT INPUTS XLR BALANCED XLH STEREO LEFT OUTPUTS REAR PANEL SHOWING LOCATION OF INPUT OUTPUT TERMINALS It is important that you connect your loudspeakers outputs and preamplifier inputs to the Plinius SA 250 Power Amplifier correctly to ensure the amplifier is not damaged and sounds it s best with your system Now that you have read and familiarised yourself with the connections on the back of the amplifier as covered in the previous section we will describe in detail the different ways in which you can connect the amplifier to your system There are essentially four different ways that you can connect your system components to the Plinius SA 250 Power Amplifier RCA STEREO RCA BRIDGED MONO XLR STEREO XLR BALANCED RCA STEREO Connect your preamplifier or input signal to the two RCA inputs at the top of the amplifier back panel Make sure you connect the red coded cable to the red RIGHT RCA input and the black or white cable to the black LEFT RCA input Also make sure the RCA connectors are a snug fit and are inserted all the way In Next connect your loudspeaker wires to the output posts on either side of the rear pane
11. away from direct contact with any temperature sensitive materials or deep pile carpets The flow of air around the amplifier should also be kept unimpeded so ensure that the heat sinks cooling fins are not covered or restricted in any way to ensure adequate ventilation The Plinius SA 250 design incorporates a very high level of mechanical decoupling of the input and output It can however still be influenced by acoustical feedback in the operating environment The use of acoustic cones or a suitably spiked amplifier stand or table may further enhance the performance of this amplifier Consult your PLINIUS dealer for further advice if required MAINS VOLTAGE CONNECTION Firstly check that the mains supply voltage printed on the rear of this amplifier is similar to the mains supply voltage in your area If in doubt please consult your PLINIUS dealer Mains supply power connection is via the supplied plug in lead A standard IEC socket connects the mains power at the amplifier end while a local mains plug is required at the wall end The wiring code used inside all Plinius product is Green to Earth Ground Blue to Neutral Brown to Phase Live should a local plug need fitting to the wall end of the lead ensure that a suitably qualified or experienced service technician wires the plug correctly IMPORTANT NOT POWER UP YOUR AMPLIFIER UNTIL YOU HAVE CONNECTED YOUR INPUT OUTPUTS CORRECTLY FOR YOUR SYSTEM AS EXPLAINED IN THE NEXT
12. d cepe acest lu UNA Page 17 Koud DONDE GC DIO osea to Page 19 MAI T TOT Page 20 Pe CLI AL Ot nues ces heer Lis IM AR I MU M MM ID ID IU MU A Es Page 21 ju Page 22 SPIRI ERE E t Mm Page 23 PRECAUTIONS Please take special note of the following precautions before operating your new amplifier The Plinius SA 250 Power Amplifier can be operated in bridged mode and may deliver in excess of 900 watts into 8 ohms This amplifier is also capable of a very large peak current delivery The Plinius SA 250 Power Amplifier operates in Class A It is capable of generating temperatures that could have an adverse effect on other equipment furniture etc DO NOT leave flammable material on the amplifier whilst running as this could pose a serious fire risk The Plinius SA 250 Power Amplifier is of direct coupled design and offers no protection from preamplifiers that have a high DC component at their outputs his amplifier operates at hazardous voltage levels We recommend that any work requiring removal of the lid or base of this amplifier be referred to a suitably qualified and experienced service technician DO NOT attempt to connect any input of this amplifier to it s own outputs DO NOT earth any output terminal or connect any of these terminals together without following the instructions in this manual or seeking qualified assistance DO NOT place this amplifie
13. itch on your amplifier XLR STEREO Connect your preamplifier or input signal to the two XLR inputs at the top of the amplifier back panel Make sure you connect the RIGHT XLR input and LEFT XLR inputs to the right and left outputs from your preamplifier respectively Also make sure the XLR connectors click into place Next connect your loudspeaker wires to the output posts on either side of the rear panel Connect your right loudspeaker ie the one on the right of you when seated in your normal listening position to the right output terminals ensuring that the red positive terminal is connected to the red terminal on your loudspeaker Do the same with the black or negative terminals Now turn the ACS switch fully clockwise then two positions counter clockwise so that it is in the XLR stereo position It is now safe to switch on your amplifier XLR BALANCED MONO As with RCA Bridged Mono this option configures your amplifier to drive one loudspeaker but from one balanced line input connected to the RIGHT XLR Input In balanced mono mode the only input made to your preamplifier is to the RIGHT channel XLR input The LEFT channel XLR input is not connected Next your loudspeakers are connected to both positive 4 channel output terminals So the positive red connection on your loudspeaker is connected to the red RIGHT amplifier output and the negative black connection on the loudspeaker should be connected to the red LEFT amplifier ou
14. l Connect your right loudspeaker ie the one on the right of you when seated in your normal listening position to the right output terminals ensuring that the red positive terminal is connected to the red terminal on your loudspeaker Do the same with the black or negative terminals Now turn the ACS switch fully clockwise so that it is in the RCA Stereo position It is now safe to switch on your amplifier RCA BRIDGED MONO his option configures your amplifier to drive one loudspeaker from one unbalanced signal fed to the red RIGHT RCA input In bridged mono mode the only input made to your preamplifier is to the red RIGHT channel RCA input The black LEFT channel RCA input is not connected Next your loudspeakers are connected to both positive 4 channel output terminals So the positive red connection on your loudspeaker is connected to the red RIGHT amplifier output and the negative black connection on the loudspeaker should be connected to the red LEFT amplifier output DO NOT CONNECT ANYTHING AT ALL THE NEGATIVE TERMINALS MAKING A CONNECTION THE NEGATIVE TERMINALS OF THE AMPLIFIER IN THIS MODE CAN CAUSE SERIOUS DAMAGE You can still connect two loudspeakers using the lower positive amplifier output terminals This is explained in the bi wiring section following Now turn the ACS switch fully clockwise then one position counter clockwise so that it is in the RCA Bridged Mono position It is now safe to sw
15. n the loudspeaker is connected to both channels positive output terminals Available power in this mode is four times the rated output of the amplifier approximately 900 watts RMS into 8 ohms Special care must be taken in connecting the input signal and loudspeakers to ensure safe operation and best possible performance BALANCED UNBALANCED SIGNALS Balanced or unbalanced input options will depend on the type of signal available from your preamplifier or other equipment The Plinius SA 250 provides both options to allow you to choose the most suitable preamplifier for your purposes Plinius Preamplifiers offer both balanced and unbalanced output options BALANCED LINE is normally used to transmit signals in a professional environment Because balanced line effectively reduces or eliminates noise pick up by the system cabling it has become increasingly more important in high quality domestic high fidelity systems UNBALANCED leads such as single ended RCA or coaxial are common and are used in the majority of audio signal systems The terminal plug and socket are most commonly called RCA and can be found on your Plinius SA 250 for use as the standard input terminals for both left and right inputs OUTPUT TERMINALS STEREO Output connections for the loudspeakers are provided on the left and right hand side of the rear panel Two parallel pairs of binding posts for each channel are fitted these provide ease of use with bi wiring and multi
16. ny time without notice For further product information or queries please contact us at the address below PLINIUS products are designed and manufactured by Audible Technologies Ltd 0 Box 1836 Palmerston North New Zealand Phone 64 6 354 8583 Facsimile 646 354 8586 Email info pliniusaudio com Internet www pliniusaudio com 2000 Audible Technologies 23
17. ple cables requiring a large contact area OUTPUT TERMINALS BRIDGED MONO In bridged mono modes the loudspeakers utilise only the positive outputs of your Plinius SA 250 In this configuration power output to the loudspeakers is dramatically increased around four times as much and is commonly used in conjunction with another amplifier for amplification of each channel from the preamplifier Please note that in order to achieve STEREO performance in either of the Mono modes it will be necessary to use two Plinius SA 250 Power Amplifiers one amplifier each for left and right channels GROUND LIFT SWITCH This switch is located adjacent to the Mains Input Socket and allows the signal ground to be disconnected from the chassis In some installations a hum loop may exist due to duplicate ground paths from different equipment Use this switch to remove the connection from OV to ground thus allowing some flexibility in your particular set up MAINS POWER CORD IEC CONNECTOR This connector is where the mains supply cable from your wall connects to the amplifier You will notice that a fuse holder is mounted within this connection and it holds a mains fuse to provide surge and overload protection for your amplifier INSTALLATION AND OPERATION PLACEMENT AND VENTILATION Your Plinius SA 250 is designed to operate at a moderately high temperature even more so when used in Class A The ideal location is on a rigid stand or floor mounted
18. posts and the other speaker cable to the lower positive red binding posts PHASING OR POLARITY It is important to achieve good stereo imaging in your listening room By observing the wiring instructions above each Power Amplifier loudspeaker combination should be in phase If you experience poor stereo image and or a lack of bass check that the loudspeaker wiring has been connected correctly We recommend that you use one of the easily obtainable test discs to help you ensure both phasing and channel orientation are correct If in doubt consult your PLINIUS dealer for advice To achieve a sound performance that is correctly aligned to your room make sure all of the leads carrying signals for the RIGHT channel loudspeaker are connected to the RIGHT input to the amplifier from your preamplifier or CD player etc Signals for the LEFT channel should be wired in a similar fashion CONNECTING THE MAINS SUPPLY Now that your Plinius SA 250 Power Amplifier is configured to your system correctly the mains cable can be plugged into the IEC connector on the back of the amplifier Once the power is connected flick the main power switch on the front panel to the right The power LED will pulse for ten seconds as the internal microprocessor and soft start circuitry allow the amplifier internal voltages to settle Once the amplifier is at full voltage the power LED will stay lit and the amplifier will be in mute Depress the mute switch to enjoy you
19. r in any position where liquids or any foreign material may accidentally enter it DO NOT connect any voltage source short circuit earth ground or appliance other than suitable high fidelity loudspeakers to the amplifier output terminals some preamplifiers processors CD players etc produce large switching pulses when switched on causing a loud click through the loudspeakers For this reason turn on all other equipment in your system before turning on your Plinius SA 250 or ensure that the amplifier is in MUTE You will not experience this phenomenon with Plinius Preamplifiers AMPLIFIER FEATURES FRONT PANEL The front of the Plinius SA 250 Power Amplifier incorporates a small panel fitted with three switches These switches control the functions most used on the amplifier MUTE FRONT PANEL LAYOUT SHOWING MUTE MAINS AND BIAS SWITCHES The operation of these switches is from the left MUTE SWITCH It is not recommended practice to interfere with the input cables while the amplifier is switched on and connected to the loudspeakers so a Mute switch is fitted to interrupt the input signal This allows you to connect and disconnect the input cables without the necessity of turning the amplifier off The switch operates on a pulse system in conjunction with an LED indicator When the amplifier powers up from start the Mute automatically engages and has to be switched for normal lis
20. r new Plinius SA 250 Power Amplifier 5 250 FEATURES ERROR DETECTION The Plinius SA 250 Power Amplifier has in built error detection This will function under the following conditions e When the amplifier is overdriven clipped e internal fuse is damaged should either of these circumstances arise the amplifier will disconnect both channels and mute the input This condition will remain until the input signal level is reduced or the damaged fuse replaced When error detection is triggered the power LED will turn off and the mute LED will pulse The internal error LED located towards the front of the circuit board in the top cavity of the amplifier will also light FUSE PROTECTION When any internal fuse is damaged one or more fuse warning LEDs will light These LEDs are under the amplifier lid located to the centre front of the main circuit board Should any of the internal fuses need to be replaced the base of the amplifier will need to be removed and the fuses located The rail fuses are near the middle of the circuit board Replace them with the same type 10 amp normal blow IMPORTANT DO NOT FIT A FUSE WITH A HIGHER RATING Please note that fuse failure may indicate a severe problem Check all speakers and speaker cables for damage short circuit Should the amplifier continue to exhibit rail fuse failure contact your PLINIUS dealer ECOLOGIC CONTROL The Plinius SA 250 is also fitted with a microprocessor which
21. s in that this facility provides the user with a much cooler operating temperature and a much reduced demand on electricity particularly at idle while the amplifier is not reproducing music This unique feature allows you to leave the Plinius SA 250 switched ON at all times rendering the amplifier ready for use and requiring only a few minutes of warm up in Class A before the very best of the amplifier s sonic qualities may be experienced BIAS A This position provides a true Class A bias to the output stage therefore ensuring the optimum performance of the amplifier during all listening events Class A amplifiers run hotter than Class AB amplifiers hence our specially designed and distinctive heat sinks Operating the amplifier in BIAS A necessitates two precautions that should be observed 1 Onswitching to BIAS A the temperature of the amplifier will quickly increase and the amplifier will become quite hot Once again we remind you to ensure that you have left adequate space around the amplifier for ventilation Ensure that no objects are resting on the amplifier and check that the heat sink cooling fins are not obstructed in any way 2 current required from the mains supply in BIAS A is approximately 1 000 watts similar to a small electric heater The amplifier should not be connected to a wall outlet that is shared with other heavy current appliances such as heaters or electric motors If in doubt check with your Plinius dealer for
22. tening The Mute Switch also disconnects the speakers while the LED is on Take care not to touch any terminals other than the outputs when changing the output loudspeaker leads MAINS SWITCH This heavy duty rocker switch in the centre of the panel turns the Mains Line Power to the amplifier ON or OFF An LED in the centre of the front panel indicates that the power is on When first switched on the power LED will pulse for ten seconds this is an initialisation sequence after which the power LED remains lit The amplifier draws a moderately high current when switched on Despite the Soft Start Circuit within the amplifier reducing current demand on the mains as the amplifier is switched on it is not good practice to rapidly turn the Mains switch on and off repeatedly BIAS SWITCH This switch on the right of the panel alters the operating bias of the amplifier The switch operates on a pulse system and lights the Bias LED when the amplifier is switched to Class A In Class AB the LED is off BIAS AB This position reduces the bias on the output stage to operate the amplifier in Class AB This is a bias configuration used by the majority of high fidelity amplifier designers for their products In Class AB your Plinius SA 250 produces very high quality sound suitable for all occasions where super critical listening is not a priority The quality of performance in this mode may exceed that of many other amplifiers so a dual benefit exist
23. tput DO NOT CONNECT ANYTHING AT ALL THE NEGATIVE TERMINALS MAKING A CONNECTION THE NEGATIVE TERMINALS OF THE AMPLIFIER IN THIS MODE CAN CAUSE SERIOUS DAMAGE You can still connect two loudspeakers using the lower positive amplifier output terminals This is explained in the bi wiring section following Now turn the ACS switch fully counter clockwise so that it is in the XLR Balanced Mono position lt is now safe to switch on your amplifier TERMINATION QUALITY Quality of the connections must be examined to ensure that high performance trouble free operation is enjoyed Check that the connections are tight but do not over tighten If bare wires are used make sure that no loose strands of wire short cross the other terminals or the amplifier chassis When using plugs such as bananas be sure to use good quality plugs with a firm fit BI WIRING Bi wiring uses two pairs of loudspeaker cables for each channel loudspeaker You will notice that the rear panel of your Plinius SA 250 has two pairs of output terminals for this purpose When using bi wires in a STEREO installation connect each wire pair to a corresponding pair of binding posts one cable to the top pair one cable to the bottom paying special attention to positive red and negative black polarity With a MONO setup remember that your speaker wires must use the red positive output posts ONLY Connect one speaker cable to the top positive 4 red binding
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