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Macro-Tech 600/1200/2400 Power Amplifiers

Page 12

3.3.2 Bridge-Mono Operation

Bridge-Mono mode is intended for driving loads with a

total impedance of 4 ohms or more (see Section 3.3.3

if the load is less than 4 ohms). Installing the amplifier

in Bridge-Mono mode is very different from the other

modes and requires special attention.

To put the amplifier in Bridge-Mono mode, turn the

amplifier off and slide the stereo/mono switch to the

right (as you face the back of the amplifier). Both out-

puts receive the signal from Channel 1 with the output

of Channel 2 inverted so it can be bridged with the

Channel 1 output. DO NOT USE THE CHANNEL 2 IN-

PUT or the signal level and quality may be greatly de-

graded. Keep the Channel 2 level control turned down

completely (counterclockwise).

Note: The input jack and level control of Channel 2 are

Fig. 3.5 Bridge-Mono Wiring

BRIDGE-MONO MODE

CH-2 CH-1

STEREO

BRIDGE

MONO

PARALLEL

MONO

INPUTS

OUTPUTS

INPUT INPUT

CH-2 CH-1

CAUTION:

TURN OFF AMPLIFIER

BEFORE CHANGING THIS SWITCH!

STEREO

BRIDGE

MONO

PARALLEL

MONO

MIXER

–

Macro-Tech Amplifier

LOUDSPEAKER

DO NOT USE

THE CHANNEL 2

INPUTS.

DO NOT

USE BLACK

BINDING

POSTS.

ONLY USE THE CHANNEL 1 INPUTS

PUSHPUSH

not defeated in Bridge-Mono mode. Any signal fed into

Channel 2 will work against and add to or distort the

signal in Channel 1.

Connect the load across the Channel 1 and 2 red bind-

ing posts with the positive lead from the load attaching

to the red post of Channel 1 and the negative lead of

the load attaching to the red post of Channel 2 as

shown in Figure 3.5. THE TWO BLACK BINDING

POSTS ARE NOT USED AND SHOULD NOT BE

SHORTED. The load must be balanced (neither side

shorted to ground).

CAUTION: Be certain all equipment (meters,

switches, etc.) connected to the mono output is

balanced. To prevent oscillations, both sides of the

line must be isolated from the input grounds.

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