Lab.gruppen fP 2400Q - Manual (Page 9)

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Bridge mono mode is used to deliver two channels' power to a single
load. The nominal impedance of the load must be more than 3 ohms. Set
the Link switch to the pressed –“IN”-position and use one of the input
connectors. You can use the remaining input connectors to carry signal
to other amps. Both level attenuators must be at the same position. We
recommend that you put them in the 0dB (full) position. Connect the
speaker as shown.
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Bridged mono mode combines the power of two channels into one
speaker. This results in twice the voltage swing, four times the peak
power and just less than three times the full power of a single channel.
One way to understand the load and power from the amplifier’s
perspective in bridged mode is that it is zero voltage at the centre of the voice-coil winding. This is
because the coil is driven with positive voltage at one pole and an equivalent negative voltage at the
other pole. So, if an 8 ohms load is connected in bridged mode, one channel shares one 4 ohms part of
the load, and the other channel shares the other 4 ohms part. The power into 4 ohms from an fP 2400
(MLS at 0dB) is 380W. So, the total bridged power into the 8 ohms load will be 2 x 380 = 760W
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