Instruction/ maintenance manual of the product SA-250 Plinius
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Class A Power Amplifier.
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3 CONGRATULATIONS CONGRATULATIONS CONGRATULATIONS CONGRATULATIONS on your decision to become the proud owner of this 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.
4 Introduction .................................................................................................................. ......................Page 3 Precautions ................................................................................
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.
6 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.
7 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.
8 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.
9 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.
10 RCA BRIDGED MONO: RCA BRIDGED MONO: RCA BRIDGED MONO: RCA BRIDGED MONO: This option configures your amplifier to drive one loudspeaker from one unbalanced signal fed to the RIGHT RCA input.
11 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.
12 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.
13 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.
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. Also make sure the RCA connectors are a snug fit and are inserted all the way in.
15 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.
16 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.
17 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.
18 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.
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.
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.
21 250-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 B B B B RIDGED RIDGED RIDGED RIDGED O O O O UTPUT UTPUT UTPUT UTPUT : :: : 900 Watts RMS 20Hz to 20kHz into 8 ohms (Mono).
22 ACS (Amplifier Configuration Selector) ......................................................................................... .. Page 9 Balanced Signal .............................................................................................
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 PLINIUS PLINIUS PLINIUS products are designed and manufactured by: Audible Technologies Ltd.
An important point after buying a device Plinius SA-250 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Plinius SA-250 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Plinius SA-250 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Plinius SA-250 you will learn all the available features of the product, as well as information on its operation. The information that you get Plinius SA-250 will certainly help you make a decision on the purchase.
If you already are a holder of Plinius SA-250, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Plinius SA-250.
However, one of the most important roles played by the user manual is to help in solving problems with Plinius SA-250. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Plinius SA-250 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
