The way the bridging works is that one channel is inverted in polarity at the input of one channel of the amp, and the other channel remains as before, then these are sent to their respective power sections. That way one channel of the amp is "going positive" as the other channel is "going negative". By connecting the speaker to the two "hot" terminals, the effective voltage delivered is doubled, which equals an increase in power in watts by a factor of 4.

By constructing a simple polarity inverting stage, almost any two identical amplifiers can be bridged in this manner, such as two of the 200s (although Outlaw would shoot me for suggesting such a thing )



[This message has been edited by soundhound (edited February 07, 2003).]