5 Power amplifiers
5.13 Stereo and bridge
Most power amplifiers have two channels. The intended application for a 2-channel amp is a stereo setup, as it is desirable to have two absolutely identical amplifiers for left and right. However, amplifying a monaural bass guitar in stereo is hardly ever needed, but having two independent amplifier channels may have several advantages:
- Dual mono or parallel: The same signal is fed to both channels, each driving a cabinet
- Bridge: Most 2-channel amps provide a possibility to link up both channels into one channel with double power. However, the minimum load impedance
is also doubled - Bi-amp : An active crossover is put in the signal chain; one channel amplifies the low frequencies, the other channel gets the high frequencies
- Stereo: Obviously for use with two (identical) cabinets. Some effects processors create stereo effects from a monaural source, and in this case a stereo setup may be interesting
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