Ashly SRA-120 Manual de instruções - Página 8

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Operating Manual - SRA-120 Power Amplifier

In situations where the power amp and its signal

source are separated by great distances, a ground voltage

difference may exist between the amp's chassis ground

and the input cable's ground. Connection of these two

grounds through the jumper strap may cause large ground

currents to flow (which is known as a ground loop), caus-

ing a hum noise in the amp's output. Unless you have

such a situation with a hum problem that cannot be solved

by using balanced input connections, the ground jumper

strap should remain in place.

7.2

Input Sensitivity Switch

This switch selects between a 0 dBu input sensi-

tivity in the "out" position for use with professional au-

dio sources, and -10 dBu input sensitivity in the "in" po-

sition for use with low line-level sources such as tape

decks, CD players, DAT machines, etc.

7.3

Normal/Bridging Switch

This switch selects between NORMAL mode in

the "out" position where both outputs are in-phase with

their respective inputs, and BRIDGED mode in the "in"

position where channel 1 output is switched out of phase

with it's input. In BRIDGED mode, the channel 2 red bind-

ing post becomes the (+) in-phase speaker output terminal

TYPICAL APPLICATIONS

8.1

Stereo Sound Reinforcement System

In this situation, the audio source feeding the SRA-120 is a professional level (0dBu) stereo mixer. All three

mode switches should be in the "out" position.

and the channel 1 red binding post becomes the (-) out-of-

phase speaker terminal. To properly operate in bridged

mono mode, the Mono switch must also be selected.

7.4

Stereo/Mono Switch

This switch selects between stereo mode in the

"out" position and mono mode in the "in" position. In

mono mode, channel 1 input is sent to both amplifier chan-

nels, and is controlled through the channel 1 level con-

trol.

7.5

Speaker Outputs - Binding Posts

A pair of dual banana binding posts provide the

stereo speaker outputs. The minimum load impedance is

4 ohms per channel in normal mode, and 8 ohms in bridged

mode. In BRIDGING mode, the channel 2 red binding

post is the (+) in-phase speaker output terminal and the

channel 1 red binding post becomes the (-) out-of-phase

speaker terminal.

CAUTION! NEVER CONNECT THE TWO RED

BINDING POSTS TOGETHER OR CONNECT

EITHER RED BINDING POST TO A BLACK

BINDING POST!