OK, I guess this is probably an "unconventional" approach, but I'm new to quads, so let me throw this out for your consideration. Just for listening purposes, I'm considering using 4 small Fender guitar-amps for each channel. I already have two 15W Fender amps, and they're pretty cheap, so I'm considering getting two more. They actually sound pretty good--nice flat frequency response, plenty loud, etc. So, is this approach unsound for any particular reason? Thanks.