Tweeter in NH made the custom sub box, Circut City installed the capacitor, and I installed the speakers and the deck. I tried to get the JL Audio 500/5 amp, and the Polk MOMO MM6 component 6.5" speakers on eBay (like the Alpine 7995 deck $350, and the JL 10W3V2-D2 sub $115), but I couldn't find any. I ended up buying the Polk's at Circut City on sale for $220 something.