Plinius Audio SA-103 User's Manual
Contents
1. 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 MONO 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 4 output terminals giving an available power in this mode four times the rated output of the amplifier approximately 460 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 103 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 configuration the loudspeaker is connected to both channels positive output terminals Available power in this mode is four times the rated output of the amplifier2. 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 103 Power Amplifier is configured to your system correctly the mains cable can be plugged into the IEC connector on the back of the amplifier Turn on the power switch on the rear panel 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 Press the mute switch to enjoy your new Plinius SA 103 Power Amplifier SA 103 FEATURES ERROR DETECTION The Plinius SA 103 P
3. FREQUENCY RESPONSE 20Hz to 20kHz 0 208 3dB at 5Hz and 3dB at 70kHz DISTORTION Typically lt 0 05 THD at rated power 0 1 THD and IM worst case prior to clipping SATURATION 140 Watts per channel or greater into 80 220 Watts per channel or greater into 40 CURRENT OUTPUT 50A short duration peak per channel Fuse protected RISE TIME Typically 5us PHASE RESPONSE 0P at 20Hz and 14 at 20kHz HUM amp NoisE 100dB below rated output 20Hz to 20kHz A weighted INPUT SENSITIVITY 0 8V RMS for rated output at 1kHz INPUT IMPEDANCE 47 HEIGHT 220mm 8 3 4 WIDTH 500mm 19 3 4 455mm 18 WEIGHT 38kg 83105 21 ACS Amplifier Configuration GEICO OT Fastis bete v nn ieee s kin aksn deuda Page 9 Bala Bl kumiset a ra a a Page 10 BS RR RPM Pages 7 20 ndn c c c MR Page 7 dbgsue M iem Page 7 BO NUM ese scene ee sesh ces eles cesses LE UU LED Page 15 Date of Manufacture Page 3 ECOIDUID GONG oss costis ctt thuc pude E PIST ISI Page 17 Emor GTEC OB oem Page 17 PEGI Ae AV OU roe cos ca ove euet cons cee coe ei cc a ce ce ce oa LA Page 6 sis Oke MOM LIIMO NEN TT Page 17 TS TT PENT SW c Page 11 EG POMO ON BO ef n Pages 11 12 EU
4. outputs of your Plinius 5 103 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 103 Power Amplifiers one amplifier each for left and right channels 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 REMOTE TRIGGER TERMINALS In order to integrate more effectively into a home theatre system the Plinius SA 103 has remote trigger terminals fitted to the rear panel By connecting a processor with a remote trigger signal to these terminals the SA 103 can be put in and out of Class AB mute by the processor to which it is connected When in Class AB mute the amplifier draws less current and will operat
5. A CONNECTION TO 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 It 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 103 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 red binding posts and the other speaker cable to the lower positive red binding posts
6. approximately 460 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 103 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 103 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 multiple cables requiring a large contact area OUTPUT TERMINALS BRIDGED MONO In bridged mono modes the loudspeakers utilise only the positive
7. 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 long 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 103 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 VR3 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 Ecologic Jumper JP5 Error LED LED Adjuster VR7 SECTION OF SA 103 MAINBOARD SHOWING POSITION OF ECOLOGIC JUMPERS AND LED BRIGHTNESS ADJUSTMENT POTENTIOMETER MAINS LINE FUSE A Mains Line fuse is fitted
8. much greater strength and the one piece housing for the remote control unit that eliminates large joints and potential creaks The very process of holding the remote tells you that you are controlling both a powerful and precise product It is designed specifically for the act of listening to music not channel surfing on a television or changing the room temperature The distinction is important because we believe that listening to music is a highly selective and emotional experience that requires a much greater level of concentration and precision to fully appreciate and enjoy As with music that you are not familiar with truly innovative new designs can take time to understand and enjoy How often have you heard music that you were first unsure of that over repeated listening has become a firm favourite Our designs are fundamentally different to many other companies and we hope that you will take the time to explore their unique character and qualities because we have not made them different simply to be different We genuinely believe that their visual and tactile qualities do improve the experience of listening to music and that is our design goal Ross Stevens Design Director gt 22 gt CONTENTS OWNS EP STET kien Page 3 PIS CAL RET T AEE EEEE A A e aA Page 5 Amplifier Features FRONT PANEL 6 Af plitierFealures REAR PANEL cuius etta ee tatu t eot bete
9. 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 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 power supply rails as seen by the output stage varies too In a 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 125 WATTS RMS PER CHANNEL INTO 8 OHMS BOTH CHANNELS DRIVEN FROM 20Hz TO 20kHz BRIDGED BALANCED MONO OUTPUT 460 Watts RMS 20Hz to 20kHz into 8 ohms
10. 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 as specified on the rear panel 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 103 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 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
11. CT DETAILS All operational technical and descriptive material published here is subject to change at any time without notice For further product information or queries please contact us at the address below PLINIUS products are designed and manufactured by Plinius Audio Ltd P 0 Box 1836 Palmerston North New Zealand Phone 64 6 354 8583 Facsimile 64 6 354 8586 Email info pliniusaudio com Internet www pliniusaudio com 2005 Plinius Audio Ltd 23
12. ONO RCA BRIDGED MONO XLR STEREO ALL IDEE i IONS USE ont ae INPUT ND LEFT HT OUTPUTS ONL E CONFIG JRATION E ECTOR ER TO OWNERS NUAL FOR USAGE INSTRUCTIONS LEFT OUTPUTS OHIO REAR PANEL SHOWING LOCATION OF INPUT OUTPUT TERMINALS It is important that you connect your loudspeakers outputs and preamplifier inputs to the Plinius SA 103 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 103 Power Amplifier RCA STEREO XLR STEREO XLR BALANCED RCA BRIDGED MONO MONO 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 panel Connect your right loudspeaker ie the one on the right of you when seated in yo
13. SA 1 O 3 POWER AMPLIFIER INSTRUCTION MANUAL hh cani pees 4 CONGRATULATIONS on your decision to become the proud owner of this Plinius SA 103 Power Amplifier This 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 103 Power Amplifier will provide years of high quality trouble free performance Serial Number Final Test Certified Bye tatit eet idees IMPORTANT PLEASE TAKE THE TIME TO READ THIS MANUAL THOROUGHLY BEFORE USING YOUR AMPLIFIER DESIGN PHILOSOPHY From a distance you can see that the design of the Plinius products is more than an applied styling exercise to the front panel We have started from the ground up to produce a casing for our electronics that is unrivalled in its physical strength and visual simplicity Wherever possible we have reduced the number of parts needed and then invested massively in refining and producing the remaining parts to the highest quality achievable with state of the art computer controlled machines allied with expert craftsman Examples of this approach include the hydraulically formed corners on the amplifiers giving
14. and disconnect the input cables without the necessity of turning the amplifier off When the amplifier powers up from start the Mute automatically closes and has to be switched for normal listening Press the button once to open the mute and again to close it The mute also disconnects the speakers while the LED is on CLASS A SWITCH This switch on the right of the panel alters the operating bias of the amplifier Press once to activate Class A and again for Class AB In Class A the LED is ON Either mode may be used for listening with Class A preferred CLASS 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 amplifiers In Class AB your Plinius SA 103 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 exists 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 103 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 amplifiers sonic qualities may be experienced CLASS A This posi
15. at have a high DC component at their outputs e his amplifier operates at hazardous voltage levels Any work requiring removal of the lid or base of this amplifier must 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 e DO NOT earth any output terminal or connect any of these terminals together without following the instructions in this manual or seeking qualified assistance e DO NOT place this amplifier 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 e 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 103 or ensure that the amplifier is in MUTE You will not experience this phenomenon with Plinius Preamplifiers AMPLIFIER FEATURES FRONT PANEL MUTE CLASSA o o FRONT PANEL LAYOUT SHOWING MUTE AND BIAS SWITCHES 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 button is fitted to interrupt the input signal This allows you to connect
16. e at minimum temperature The output relays are also open disconnecting the loudspeakers This may be of advantage in a multi amplifier and or remote installations The Class AB mute mode can only be activated via the remote trigger terminals Polarity of the connections to the remote trigger is not important 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 Note that in both XLR modes the ground lifting switch should always be set to chassis 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 103 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 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 coo
17. eptional 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 CAUTION ENSURE ADEQUATE VENTILATION RIGHT OUTPUTS LEFT OUTPUTS RIGHT INPUTS LEFT INPUTS N RCA STEREO LR BALANCED MONO 25 RCA BRIDGED MONO XLRSTEREO ALL MONO BRIDGE OPTIONS USE RIGHT INPUT AND RIGHT OUTPUTS ONLY e 4 avenssecourisunation sssr 0 4 EFER TO OWNERS MANLAL FOR USAGE INSTRUCTIONS REW ZEALAND E ACIE IN CAUTION AUDIO TND PO BCX 1935 FSK GO ONGT GENT PAL NORTH c G 46 2258 ON OFF PLINIUS SA 103 EL EM STEREO POWER AMPLIFIER SERIAL No VOLTAGE Hz POVWER erg CONSLIVPTION sg SEEN 1100VA MAINS FUSE REPLACE PLINIUS SA 103 REAR PANEL SHOWING ALL THE AVAILABLE FACILITIES INCLUDING INPUT AND OUTPUT TERMINALS ACS AMPLIFIER CONFIGURATION SELECTOR MAINS INPUT AND GROUND LIFT INPUT TERMINALS Input terminals for your Plinius SA 103 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 f
18. he 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 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 TO THE NEGATIVE TERMINALS MAKING
19. ling fins are not covered or restricted in any way to ensure adequate ventilation The Plinius SA 103 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 DO NOT POWER UP YOUR AMPLIFIER UNTIL YOU HAVE CONNECTED YOUR INPUT OUTPUTS CORRECTLY FOR YOUR SYSTEM AS EXPLAINED IN THE NEXT SECTION RIGHT OUTPUTS INPUT OUTPUT CONNECTION RIGHT INPUTS EFT INPUTS RCA STEREO XLR BALANCED M
20. n Page 8 Amplifier Configuration Selector ACS ee eem Page 9 Balanced Unbalanced Signals aac acc tt RE ER Page 10 12 Input Output Connection 5 sta enne epe pL Lp E Ert Page 13 csc ep DERE ERES reet Page 14 SER OITIS DTI DEG cecus RR REEL E LE RR Page 15 SAT S ROA TU NER EGER MUR MEM Page 17 en ERR Page 19 ASSIST MUR dM Page 20 SDEEUICHHONS s MEUM d Page 21 ln qe rH UE Page 22 Belles tat E EM Page 23 PRECAUTIONS Please take special note of the following precautions before operating your new amplifier e Plinius SA 103 Power Amplifier can be operated in mono mode delivering up to 460 watts into 8 ohms This amplifier is also capable of a very large peak current delivery e The Plinius SA 103 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 e The Plinius SA 103 Power Amplifier is of direct coupled design and offers no protection from preamplifiers th
21. od o c c E Pages 9 14 15 LED Brightness N Page 18 EQUUS AMG EIGER CG Page 19 teats Page 19 VISUS Page 18 Mains Supply CODEC OI Pages 12 16 Mains OWEN REN ies fs te a UR DUUM pU Page 11 Mono Operation RR RR RECHERCHE Pages 10 14 15 NIUE ST ICE INN non RH RR Page 6 Operating Temperature rete me ritratto litri Pages 5 12 TE PIERDEN OTt Pages 10 14 15 aes os turn AL Page 16 EE UE ER MU Me Pages 5 12 Ball P USES esos Page 17 RCA Bridged ccce te RD RE Pages 10 14 ub ESI TTC Pages 9 14 s AO i bine ane a Md 8 Sale re ___ 5 Ser IN Cah e mp Om mm Page 3 STET OO DETO TRIER RE Pages 10 14 15 Te RB ce e d b d le t RURAL Lt LL LL eL a dec Page 15 es mem E Page 10 TT TOT 5 12 Balanced MONO Re Pages 10 15 leet A et att tit dt tl AC ett it Pages 10 14 22 CONTA
22. ower Amplifier has in built error detection This will function under the following conditions e When the amplifier is overdriven clipped e If any 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 near the centre of the main circuit board with the rail fuse holders If any of the internal fuse LED s are glowing the lid of the amplifier will need to be removed and the fuse adjacent to the lit LED should be replaced 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 etc Should the amplifier continue to exhibit rail fuse failure contact your PLINIUS dealer ECOLOGIC CONTROL The Plinius SA 103 is also fitted with a microprocessor which monitors and performs the Bias and Mute functions It is programmed to switch the amplifier back into Class AB
23. rom 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 The XLR pin configuration used in all Plinius product is PIN 1 to GND PIN 2 to 4 Signal PIN 3 to Signal NOTE Because of the way our XLR and balanced inputs are configured it is not possible to connect both XLR and RCA at the same time 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 103 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 Stereo or Mono use of this amplifier will depend on the type of ancillary equipment employed with your system If you wish to use this amplifier as a single channel mono Power Amplifier in a stereo high fidelity system then another 5 103 will be required for the other channel This will provide an extremely high performance option RCA STEREO XLR BALANCED MONO RCA BRIDGED MONO XLRSTEREO ALL MONO BRIDGE OPTIONS USE RIGHT INPUT ANDLEFT RIGHT OUTPUTS ONLY AMPLIFIER CONFIGURATION SELECTOR REFER TO OWNERS MANUAL FOR USAGE INSTRUCTIONS
24. tion provides 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 Class A necessitates two precautions that should be observed 1 Onswitching to Class 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 he power required from the mains supply in Class is approximately 500 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 advice AMPLIFIER FEATURES REAR PANEL This 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 s operation and a logical approach should ensure that you are able to make all connections with ease Please remember that your Plinius SA 103 Power Amplifier is a high quality electronic instrument capable of an exc
25. ur 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 This 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 TO THE NEGATIVE TERMINALS MAKING A CONNECTION TO 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 switch on your amplifier XLR STEREO Connect your preamplifier or input signal to t
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