Still working on that, I've been thinking:
4x Pioneer TS-G1644R
1x Headunit with GPS (still trying to find one)
1x or 2x (if needed) Pioneer TS-WX120A (powered subwoofer)
4 sets of the coax? Ew. Just put the money towards a set of splits.
You would only need one underseat sub. I don't think two would be all that much louder than one underseat
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