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Plinius SA-250 Instruction Manual

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

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Summary of Contents for Plinius 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 3 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: ...
  • Page 4 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...
  • Page 5 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.

  • Page 6: Mute Switch

    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. A BIAS MUTE RONT ANEL AYOUT HOWING AINS WITCHES The operation of these switches is, from the left:...

  • Page 7: Bias Switch

    (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.
  • Page 8 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).

  • Page 9: Input Terminals

    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.

  • Page 10: Balanced/Unbalanced Signals

    XLR BALANCED MONO: XLR BALANCED MONO: 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 configuration, the loudspeaker is connected to both channels positive (+) output terminals.

  • Page 11: Ground Lift Switch

    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.

  • Page 12: Placement And Ventilation

    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.
  • Page 13 RIGHT INPUTS RCA STEREO RCA BRIDGED MONO RIGHT OUTPUTS AMPLIFIER CONFIGURATION SELECTOR REFER TO OWNERS MANUAL FOR USAGE INSTRUCTIONS ANEL HOWING 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.
  • Page 14 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.
  • Page 15 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.

  • Page 16: Connecting The Mains Supply

    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.

  • Page 17: Error Detection

    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.

  • Page 18: Led Brightness Control

    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.
  • Page 19 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.
  • Page 20 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.

  • Page 21: Harmonic Distortion

    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. B B B B O O O O : : : : 900 Watts RMS 20Hz to 20kHz into 8 ohms (Mono). RIDGED RIDGED UTPUT...
  • Page 22 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...
  • Page 23 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 PLINIUS PLINIUS Audible Technologies Ltd.

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