Plinius Audio SA-250 User's Manual

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Plinius Audio SA-250 User's Manual | Manualzz

C l a s s A P o w e r A m p l i f i e r

2

Plinius SA-250 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-250 Power Amplifier will provide years of high-quality, trouble-free performance.

Serial Number: ..................................................................................

Date of Manufacture: ..................................................................................

Final Test Certified By: ..................................................................................

IMPORTANT: PLEASE TAKE THE TIME TO READ THIS MANUAL

THOROUGHLY BEFORE USING YOUR AMPLIFIER.

3

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

4

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.

• This 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 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.

• 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.

5

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 A BIAS

F

RONT

P

ANEL

L

AYOUT

S

HOWING

M

UTE

, M

AINS

A

ND

B

IAS

S

WITCHES

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 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 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.

6

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: 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 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-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 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.

On switching 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.

The 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 advice.

7

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 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

RIGHT OUTPUTS

RCA STEREO

RCA BRIDGED MONO

XLR BALANCED MONO

XLR STEREO

AMPLIFIER CONFIGURATION SELECTOR

REFER TO OWNERS MANUAL FOR USAGE INSTRUCTIONS

LEFT OUTPUTS

CAUTION: ENSURE ADEQUATE VENTILATION

PLINIUS SA-250 MkIV

STEREO POWER AMPLIFIER

SERIAL No.

VOLTAGE Hz.

POWER

CONSUMPTION

50/

60

2000VA

DESIGNED AND MANUFACTURED IN

NEW ZEALAND BY

AUDIBLE TECHNOLOGIES LTD

P.O. BOX 1836

PALMERSTON NORTH

CAUTION:

CAUTION

TO REDUCE RISK OF

RISK OF ELECTRICAL SHOCK

DO NOT OPEN

COVER. NO USER SERVICEABLE

PARTS INSIDE. REFER SERVICING TO

QUALIFIED SERVICE PERSONNEL.

CHASSIS

OPEN

GROUND

LIFT

R

EAR

P

ANEL

O

F

T

HE

P

LINIUS

SA-250 S

HOWING

A

LL

O

F

T

HE

A

VAILABLE

F

ACILITIES

I

NCLUDING

I

NPUT

A

ND

O

UTPUT

T

ERMINALS

, ACS (A

MPLIFIER

C

ONFIGURATION

S

ELECTOR

), M

AINS

I

NPUT

A

ND

G

ROUND

L

IFT

.

8

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 & RIGHT: most signal sources such as audio preamplifiers.

XLR BALANCED INPUTS LEFT & RIGHT 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.

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 SA-250 will be required for the other channel. This will provide an extremely high performance option.

RCA STEREO

RCA BRIDGED MONO

XLR BALANCED MONO

XLR STEREO

* ALL MONO/BRIDGE OPTIONS USE RIGHT INPUT AND

LEFT + RIGHT + OUTPUTS ONLY

AMPLIFIER CONFIGURATION SELECTOR

REFER TO OWNER’S MANUAL FOR TECHNICAL DESCRIPTIONS

A

MPLIFIER

C

ONFIGURATION

S

ELECTOR

The ACS switch options are:

RCA STEREO signal connected to both left and right input RCA inputs.

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RCA BRIDGED MONO: 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: 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: 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 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 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 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 multiple 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.

10

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 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 mounted within this connection, and it holds a mains fuse to provide surge and overload protection for your amplifier.

11

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 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

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

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:

Gr een 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).

12

RIGHT INPUTS LEFT INPUTS

RIGHT OUTPUTS

RCA STEREO

RCA BRIDGED MONO

XLR BALANCED MONO

XLR STEREO

AMPLIFIER CONFIGURATION SELECTOR

REFER TO OWNERS MANUAL FOR USAGE INSTRUCTIONS

LEFT OUTPUTS

R

EAR

P

ANEL

S

HOWING

L

OCATION

O

F

I

NPUT

/O

UTPUT

T

ERMINALS

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:

1. RCA STEREO

2. RCA BRIDGED MONO

3. XLR STEREO

4. XLR BALANCED MONO

13

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 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

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 (+) 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 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.

14

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 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-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 (+) red binding posts, and the other speaker cable to the lower positive (+) red binding posts.

15

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

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 your new Plinius SA-250 Power Amplifier.

16

ERROR DETECTION

The Plinius SA-250 Power Amplifier has in-built error detection. This will function under the following conditions:

• When the amplifier is overdriven/clipped

• 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 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 etc. 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 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.

17

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

Ecologic Jumper JP4 Fuse LEDs Error LED LED Adjuster VR5

S

ECTION

O

F

SA-250 M

AINBOARD

S

HOWING

P

OSITION

O

F

E

COLOGIC

J

UMPERS

A

ND

L

ED

B

RIGHTNESS

A

DJUSTMENT

P

OTENTIOMETER

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.

18

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 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

19

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. 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

250-WATTS RMS PER CHANNEL INTO 8 OHMS.

450-WATTS RMS PER CHANNEL INTO 4 OHMS.

BOTH CHANNELS DRIVEN FROM 20Hz TO 20kHz AT 0.05% TOTAL

HARMONIC DISTORTION.

S BBBB RIDGED OOOO UTPUT :::: 900 Watts RMS 20Hz to 20kHz into 8 ohms (Mono).

S DDDD YNAMIC HHHH EADROOM :::: 1dB or greater at 8 ohms with music.

S FFFF REQUENCY RRRR ESPONSE :::: 20Hz to 20kHz ±0.2dB. 0dB at 0Hz and -3dB at 70kHz.

S DDDD ISTORTION :::: Typically <0.05% THD at rated power. 0.1% THD and IM worst case prior to clipping.

S SSSS ATURATION :::: 300 Watts per channel or greater into 8Ω.

S VVVV OLTAGE SSSS WING :::: 130V pp

per channel.

S CCCC URRENT OOOO UTPUT :::: 70A short duration peak per channel. Fuse protected.

S RRRR ISE TTTT IME :::: Typically 5µs.

S PPPP HASE RRRR ESPONSE :::: +0° at 20Hz and -14° at 20kHz.

S HHHH UM & N OISE :::: 100dB below rated output 20Hz to 20kHz A-weighted.

S IIII NPUT SSSS ENSITIVITY :::: 1.2V RMS for rated output at 1kHz.

S IIII NPUT IIII MPEDANCE :::: 47kΩ.

S HHHH EIGHT :::: 275mm (10 3/4")

S W IDTH :::: 510mm (20")

S DDDD EPTH :::: 535mm (21")

S W EIGHT :::: 57kg (125lbs)

21

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

Balanced Signal ...........................................................................................................................Page 10

Bias Class A............................................................................................................................Pages 7,20

Bias Class AB.................................................................................................................................Page 7

Bias Switch ....................................................................................................................................Page 7

Bi-wiring......................................................................................................................................Page 15

Date of Manufacture .......................................................................................................................Page 3

Ecologic Control ..........................................................................................................................Page 17

Error Detection .............................................................................................................................Page 17

Front Panel Layout..........................................................................................................................Page 6

Fuse Protection ............................................................................................................................Page 17

Ground Lift Switch........................................................................................................................Page 11

IEC Power Connector.............................................................................................................Pages 11,12

Input Terminals .................................................................................................................. Pages 9,14,15

LED Brightness Control ................................................................................................................Page 18

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

Serial Number................................................................................................................................Page 3

Stereo Operation .............................................................................................................. Pages 10,14,15

Terminations ................................................................................................................................Page 15

Unbalanced Signal .......................................................................................................................Page 10

Ventilation...............................................................................................................................Pages 5,12

XLR Balanced Mono Input......................................................................................................Pages 10,15

XLR Stereo Input ...................................................................................................................Pages 10,14

22

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.

64 6 354 8583

Facsimile: 64 6 354 8586 [email protected]

www.pliniusaudio.com

23

©2000 Audible Technologies.

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Key Features

  • Class A operation for consistent power output
  • Balanced and unbalanced inputs for flexible connectivity
  • Amplifier Configuration Selector (ACS) for various configurations
  • Protection from preamplifiers with high DC component at outputs
  • Mute switch for safe input cable handling
  • Separate power supply for each channel to minimize crosstalk

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Frequently Answers and Questions

What are the benefits of Class A operation?
Class A operation provides higher fidelity and lower distortion compared to other amplifier classes.
Can I connect my unbalanced source to the amplifier?
Yes, the amplifier has both balanced and unbalanced inputs for flexible connectivity.
What is the purpose of the Amplifier Configuration Selector (ACS)?
The ACS allows you to configure the amplifier for different system requirements, such as bridged mode for higher power output.
Is the amplifier protected from preamplifiers with high DC component?
Yes, the amplifier is protected to prevent damage from preamplifiers with high DC component at their outputs.
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