Parallel-Mono Operation; Parallel-Mono Wiring - Crown Macro-Tech 3600VZ Reference Manual

3.3.3 Parallel-Mono Operation

Parallel-Mono mode is used to drive loads with a total
impedance of less than 4 ohms. (See Bridge-Mono if
the load is 4 ohms or greater.) Installing the amplifier in
Parallel-Mono mode is very different from the other
modes and requires special attention.
CAUTION: Do not attempt to operate in Stereo or
Bridge-Mono mode until the Parallel-Mono jumper
is first removed. Failure to do so will definitely cause
inefficient operation, high distortion and excessive
heating.
To put the amplifier in Parallel-Mono mode, first turn it
off, then slide the Stereo/Mono switch to the left (as you
face the back). Connect the input signal to Channel 1
only. DO NOT USE THE CHANNEL 2 INPUT or the sig-
nal level and quality may degrade greatly. Turn off the
Channel 2 Level control (full counterclockwise).
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Note: It is normal for the IOC indicator of Channel 2 to
stay on in Parallel-Mono mode.
The input jack and Level control of Channel 2 are not
defeated in Parallel-Mono mode. Any signal fed into
Channel 2 may work against and add to or distort the
signal in Channel 1.
Install a jumper wire between the red binding posts of
both Channel 1 and 2 that is at least 14 gauge in size.
Then, connect the load to the output of Channel 1 as
shown in Figure 3.6. The positive lead from the load
connects to the red binding post of Channel 1 and the
negative lead from the load connects to the black bind-
ing post of Channel 1.
CAUTION: Remove the jumper wire before chang-
ing to any mode except Parallel-Mono.
Fig. 3.6 Parallel-Mono Wiring
Macro-Tech 3600VZ Power Amplifier
Reference Manual