Crown ma-1200 Guide De Référence
Macro-Tech 600/1200/2400 Power Amplifiers
Page 12
Reference Manual
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.
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).
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.
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).
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 bal-
anced. To prevent oscillations, both sides of the line
must be isolated from the input grounds.
switches, etc.) connected to the mono output is bal-
anced. To prevent oscillations, both sides of the line
must be isolated from the input grounds.