You math is fine and focal is good, I would not go with sony for a head unit or anything else ever sense there "xplod" line. I would also just not pair them with Jl stuff. I would for a serious install look at Hertz, audioson, zapco, and rainbow. Also focal has different models for how much you want to spend. If you want higher end focals your going to have to spend more. Also do not forget install and labor.
However getting back to the subject at hand you should always run new wires with new speakers. And run a new amp and processor with a bose system to get the best sound out of your new speakers.
Last edited by bigaudiofanat; 08-01-2011 at 08:36 AM.
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