I had three 13w7's with 4K watts, and I had three 15" sx's with about the same power. NO COMPARISON whatsoever! The SX's are waaaaaaaay louder (at least in my truck both with factory-spec ported boxes). fwiw, The w7's seemed to have a bit better playing range...they banged out the higher and lower notes with similar authority (could've been box tuning, but the w7's were actually tuned LOWER - 28hz - than the sx's - 34hz). The lows on the sx's are no joke though. IMO, I'd do the sx's without a doubt. Plus...I paid more than twice as much for the w7's. Hope this helps.