There is no such thing as a cheap but good amp, unless you don't want much power. Figure you what the RMS is on the bass tube, and go buy yourself a good amp. You'll thank yourself for doing it in the long run. I've been told that it's a bad idea to mount an amp under the drivers seat as it gets little to no air to keep it cool, and if it gets hot enough, it could begin to burn the carpet. Just what I've heard, no evidence though.
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