I've never seen a 5 channel amp, though...
Go to a store. Last time I was in a Tweeter the place was practially wall papered with them. I have an Eclipse 5 channel amp in my SVX and it works great. It cost me about $600. Kicker, JL, and Alpine also make them.
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-Rob Riccardelli
80GB 16MB MK2 090000736