Directed Electronics A1200/4 - Manual (Page 15)

suitable subwoofer or center channel. Deriving the mono channel is
accomplished by using the Left Channel Positive wire (L+) as the
positive speaker wire and the Right Channel Negative wire (R-) as
the negative speaker wire.
Note: It is important that a minimum 4 ohm impedance is observed.
If the impedance drops below 4 ohms while the amplifier is wired in
the bridged configuration, the amplifier’s protection circuitry may
engage.
MIXED MONO OUTPUT
The ability to run stereo speakers while simultaneously running a
mono output from the same amplifier is accomplished by running
the stereo speakers normally and tapping into the appropriate wires
for the “mixed mono” channel (left channel positive for the positive
speaker wire and right channel negative for the negative speaker
wire). Speaker impedance should be no lower than 2 ohms on the
stereo channels and 4 ohms on the mono channel.
Note: Passive crossovers must be used for “mixed mono” operation.
Choose a low pass crossover around 100Hz for your subwoofer,
then choose a high pass crossover for your stereo channels. The
high pass crossover must be at the same or slightly higher
frequency than the low pass crossover to maintain the correct
impedance. See your
PrecisionPower dealer or call 1-800-
62POWER for more information about passive crossovers.
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