Is it possible to use a stereo amplifier to power my centre speaker using the pre outs from my main receiver?. In particular I'm not sure how this setup works bearing in mind the stereo amp has 2 channels, but I'm trying to use it to power just one speaker. Do I just plug my speaker cable into only the left or right channel outputs?. I heard that running a stereo amp using only one channel output might cause damage to the amp...??. Cheers.