Hmmm, well there is a 504 and a 704 (which I already have) but I have never heard of an X604. Are you referring to the Elite604? If so, it is only putting out 80W (rms) x 4. That's going to be really under powering these 6.5's. Maybe I would be better off keeping my X704 which I already have being that it is a 4-channel and pumps out 105W (rms) x 4. What do you think?
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