If you haven't opened/installed that gear yet, take it back. Don't give those assholes at Visions your money. Never have I hated a store more than them.
Only reason I suggest this (not just because of the Vision dicks) is maybe you can shoot orgasm_donor a dollar/budget for an amp/sub/box. You might be surprized at what he could do for you. Not to mention you might end up with nicer/better sounding gear

SoundsGood won't let you down.
But if it's already half way into your car, then not to worry. It'll do the job!