No. All of the negatives are isolated for amps rated to produce more than ~5 watts into 4 ohms. In a standard head unit. There are actually 4 bridged amplifiers. The negative speaker wires have signal on them.
In most bridgeable amplifiers, the negative of one channel has signal and the positive is actually ground.
In most bridgeable amplifiers, the negative of one channel has signal and the positive is actually ground.
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