If as an add on, just remember to wire the speakers in parallel to the head unit. Without a head unit is easiest. Its been done, I've seen it on a couple old cars, and a lot of golf carts. This is actually on my list this month. You won't be able to adjust fade/balance, but I only run 2 speakers. The volume can be adjusted directly from the phone.
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Shooting for 600 miles of range at 65-70 mph out of a vx.
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