Posted April 29, 201213 yr I have a cheap 2 channel Lightning Audio amp that was given to me. I first hooked it up on my bench to see if it worked. It did, however, it sounded like it was only playing sound that was panned hard left/right and nothing below about 500hz. I took it apart, and the ground that was soldered to the board from the RCA's was broken. If you pushed the RCA's so that the connection was made, it played fine, but one channel was about half as loud as the other. So I took a set of RCA inputs from another amp that didn't work and replaced the ones on the LA amp. The exact same situation.. One channel is twice as loud as the other. I've tried 3 different sets of RCA cables and 3 different sources of input to the amp, all with the same results. Anyone know what or why this could be? Nothing else on the board looks to be blown or burnt. If you bridge the amp, it plays the same volume as the channel that is twice as loud as the other. However, it will play bridged if the + is wired the + on one channel, and the - is wired to the + on the other channel as well instead of - . How could this be?
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