JBL MPC - Manual (Page 13)

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Low Impedance Bridged Mono
Applications—The bridged mono mode produces higher output voltages with the trade-off
of requiring a higher impedance load and providing a slightly lower damping factor. Never-
theless, it is an effective way of providing very high power levels to loudspeakers such as 4 Ω
or 8 Ω subwoofers.
Minimum Impedance—The bridged mono configuration places the two channels of the
amplifier in series with each other. As such, each channel is seeing half the total load imped-
ance. For example, connecting a 4 Ω speaker in bridged mono results in each amp channel
“seeing” a 2 Ω load. Since each channel individually is capable of driving a 2 Ω minimum
impedance, a bridged mono MPC amplifier requires a 4 Ω Ω Ω Ω Ω minimum impedance.
Power Drive Capabilities—The table below shows the low impedance power drive capabilities
into 4 Ω and 8 Ω loads of the MPC amplifiers in bridged mono mode:
Model Minimum Load Power Into 8 Ω Power Into 4 Ω Power Into 2 Ω
MPC200 & 200T 4 Ω 450 Watts 700 Watts DO
MPC300 & 300T 4 Ω 600 Watts 900 Watts NOT
MPC600 & 600T 4 Ω 1200 Watts 1800 Watts USE
High Impedance Bridged Mono
Distributed System Bridged Mono Applications—Placing the “T” models in bridged
mono mode permits higher drive voltages (140V and 200V) for reducing the effect of cable
resistance when driving extremely long loudspeaker lines. The loudspeakers and speaker
transformers connected to these lines must be capable of handling these higher voltages, and
the speaker cabling itself may be subject to special local or national safety code requirements.
Parallel Mono Configuration
The “Parallel” mode ties the two channel inputs together so that both are driven by the same
signal, without the need for external jumpers or wiring. After the inputs, both channels operate
independently. Though they carry the same signal, their gain controls affect only their
respective channels, and they must use separate speakers. Never parallel the speaker
outputs!
Only the models MPC300, 300T, 600, and 600T feature a mode switch; to place any of these
in parallel mode, set the switch to the “Parallel” position. To feed the same input signal to the
two channel inputs on models MPC200 and 200T, simply use jumper wires on the Euroblock
barrier strip input connector to parallel the two channel inputs: “+” to “+” and “-” to “-.”