Mine (kinda in flux):
Tablet: $250
Amp: $300
Subs: $120
Wires and whatnot: $100ish
So yeah, about $800. My mids and highs I've had in a box since about 2007, so they are LONG paid for.
<edit> It's in flux because I can't decide if I want to put my audio gear in the Corvette "for now" or build a separate system. It's only money, right?
