Instead of going with all 6X8's, use component speakers. they will sound a 100% better with that kind of power going to them. I'd use 6" separates in the front and maybe if you are a little handy, modify the rear speaker opening to accept 8" subs. This configuratiopn should give you very good sound with the abilliy the play it pretty loud with minimal distortion.
Simon
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New Tank! Some LR, lots LS, some fish, big pump, fat skimmer, bright lights, and salty water!:0
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