Don't go 4 channel. What is the rating on the subs? Personally, I've got an alpine type S DVC (basically the same as two subs) sub wired in paralell hooked up to a 300 watt JBL type D power series amp. It works really well. My advice would be to wire your subs in paralell and use a mono sub amp. JBL makes a nice one as I said b4. You can find them pretty cheap on ebay too.
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