AUSTRALIAN MONITOR AM1200 Specifications download pdf (Page 15)

Bridge Mode 15

5. Bridge Mode

The term BRIDGE is used when two independent

amplifier channels are used to drive the same load. The

load is in series (a bridge) between the two amplifier

channels.

Channel A is used as the "dominant" channel and its

output is in phase with the input signal, and channel

B has its phase reversed so it is exactly 180

out of

phase with the input signal.

As two amplifiers with a phase difference of 180

are

now driving the load you will now have double the

voltage into the load. This means you will now have four

times the power into that load. The output can now be

considered as an active balanced output.

A common use of an amplifier in BRIDGE mode is for

driving 70 volt & 100 volt distribution lines. In BRIDGE

mode, The AM1200 can produce over 70 volts with line

impedances greater than 8 ohms and over 80 volts with

line impedances greater than 16 ohms.

Equally the units can be used in bridge mode to provide

the correct voltage/power requirements for an applica-

ble load.

As shown in Figure 6, there are three steps in setting

Figure 6 Bridge Mode Speaker Connection

up your amplifier for running it in BRIDGE mode.

Whilst the amplifier is off,

1. Connect the signal source to the Channel-A (or D)

female input XLR. The Channel-A (or D) attenuator

becomes the level control for both channels.

2. Engage the “push to bridge” switch.

3. Connect your load between the red binding post

output terminals, where the positive side of the

load is connected to the channel A (or D) output

(marked BRIDGE+) and the negative side of the

load goes to the channel B (or C) output (marked

BRIDGE-). There are no further connections re-

quired.

You can also source the output from the Channel-A (or

D) SPEAKON output connector where Channel-A (or

D) will be on the pin marked 1+ and Channel-B (or C)

will be on the pin marked 2+.

NOTE: You should check after market manufactured

Speakon interconnecting speaker leads before con-

necting them to your amplifier. Some leads are manu-

factured for specific purposes, or specific use, and

may have pins shorted inside the connector. Any

speakon lead with shorted pins will obviously short the

output of your amplifier (either to ground, or output to

output - be careful).

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AUSTRALIAN MONITOR AM1200 Specifications Page 15

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