Plinius SA-250 Page 4 Instruction Manual Download | Manualshive

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4

Introduction ........................................................................................................................................Page 3

Precautions ........................................................................................................................................Page 5

Amplifier Features - FRONT PANEL .....................................................................................................Page 6

Amplifier Features - REAR PANEL .......................................................................................................Page 8

Amplifier Configuration Selector (ACS) ...............................................................................................Page 9

Balanced/Unbalanced Signals ..........................................................................................................Page 10

Installation and Operation .................................................................................................................Page 12

Input/Output Connection ...................................................................................................................Page 13

RCA Connection ...............................................................................................................................Page 14

XLR Connection ................................................................................................................................Page 15

SA-250 Features ..............................................................................................................................Page 17

Loudspeaker Selection .....................................................................................................................Page 19

Why Class A is better .......................................................................................................................Page 20

Specifications ..................................................................................................................................Page 21

Index ................................................................................................................................................Page 22

Contact Details .................................................................................................................................Page 23

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Summary of Contents for SA-250

Page 1: ...C l a s s A P o w e r A m p l i f i e r ...

Page 2: ...2 ...

Page 3: ...d 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 Certified By IMPORTAN...

Page 4: ...Configuration Selector ACS Page 9 Balanced Unbalanced Signals Page 10 Installation and Operation Page 12 Input Output Connection Page 13 RCA Connection Page 14 XLR Connection Page 15 SA 250 Features Page 17 Loudspeaker Selection Page 19 Why Class A is better Page 20 Specifications Page 21 Index Page 22 Contact Details Page 23 ...

Page 5: ...ny 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 amplifier in any...

Page 6: ...ifier powers up from start the Mute automatically engages and has to be switched for normal listening 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 LE...

Page 7: ...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 BIAS A BIAS A 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 de...

Page 8: ...guration Selector REAR PANEL OF THE PLINIUS SA 250 SHOWING ALL OF THE AVAILABLE FACILITIES INCLUDING INPUT AND OUTPUT TERMINALS ACS AMPLIFIER CONFIGURATION SELECTOR MAINS INPUT AND GROUND LIFT AMPLIFIER CONFIGURATION SELECTOR REFER TO OWNERS MANUAL FOR USAGE INSTRUCTIONS RCA STEREO RCA BRIDGED MONO XLR BALANCED MONO XLR STEREO RIGHT INPUTS LEFT INPUTS DESIGNED AND MANUFACTURED IN NEW ZEALAND BY AU...

Page 9: ...lifier 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 Stereo or Mono use of this amplifier will depend on the type of ancillary equipment employed with your system I...

Page 10: ...kers 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 BALA...

Page 11: ...connected 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 0V 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 mo...

Page 12: ...aler 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 PLINIUS PLINIUS 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 whi...

Page 13: ... 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 1 RCA STEREO 2 RCA BRIDGED MONO 3 XLR STEREO 4 XLR BALANCED MONO AMPLIFIER CONFIGURATION SELECTOR REFER TO OWNERS ...

Page 14: ... 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 stil...

Page 15: ...ined 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 su...

Page 16: ... 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 t...

Page 17: ...th 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 PLINIUS PLINIUS PLINIUS dealer ECOLOGIC CONTROL The Plinius SA 250 is also fitted with a microprocessor whic...

Page 18: ...LEDs Error LED LED Adjuster VR5 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...

Page 19: ...ase 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 the rated perfo...

Page 20: ... 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 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 to...

Page 21: ...URATION ATURATION 300 Watts per channel or greater into 8Ω S V V V VOLTAGE OLTAGE OLTAGE OLTAGE S S S SWING WING WING WING 130Vpp per channel S C C C CURRENT URRENT URRENT URRENT O O O OUTPUT UTPUT UTPUT UTPUT 70A short duration peak per channel Fuse protected S R R R RISE ISE ISE ISE T T T TIME IME IME IME Typically 5µs S P P P PHASE HASE HASE HASE R R R RESPONSE ESPONSE ESPONSE ESPONSE 0 at 20Hz...

Page 22: ...dspeaker Impedance Page 19 Loudspeaker Power Page 19 Mains Line Fuse Page 18 Mains Supply Connection Pages 12 16 Mains Switch Page 6 Mono Operation Pages 10 14 15 Mute Switch Page 6 Operating Temperature Pages 5 12 Output Terminals Pages 10 14 15 Phasing Page 16 Placement Pages 5 12 Rail Fuses Page 17 RCA Bridged Mono Input Pages 10 14 RCA Stereo Input Pages 9 14 Rear Panel Layout Page 8 Safety Pr...

Page 23: ...Technologies Ltd Audible Technologies Ltd Audible Technologies Ltd Audible Technologies Ltd P O Box 18 P O Box 18 P O Box 18 P O Box 1836 36 36 36 Palmerston North Palmerston North Palmerston North Palmerston North New Zealand New Zealand New Zealand New Zealand Phone Phone Phone Phone 64 6 354 8583 Facsimile Facsimile Facsimile Facsimile 64 6 354 8586 Email Email Email Email info pliniusaudio com...

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