Crown ma-1200 Guida Di Riferimento

3.3.2 Bridge-Mono Operation
Bridge-Mono mode is intended for driving loads with a
total impedance of 4 ohms or more (If the load is less
than 4 ohms, see Section 3.3.3). 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 am-
plifier off and slide the stereo/mono switch to the right
(as you face the back of the amplifier). Both outputs
receive the signal from Channel 1 with the output of
Channel 2 inverted so it can be bridged with the Chan-
nel 1 output. DO NOT USE THE CHANNEL 2 INPUT or
the signal level and quality may be greatly degraded.
Keep the Channel 2 level control turned down com-
pletely (counterclockwise).

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

Fig. 3.5  Bridge-Mono Wiring

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).