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the W7's do not have a 15" ........ the 13W7 is the comparable model. I assume you are strictly interested in SPL since you made no mention of any mids or tweets at all.
You will need LOTS of room for a custom box, 3 big class D amps - one for each W7, and a bigger alternator. Most SPL competitors also have a bank of specially wired batteries.
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