So I was at Best Buy and I had them price me out a speaker install. What they recommended was this: Kicker - CompR 12" dual-voice-coil 2-Ohm loaded subwoofer enclosure Kicker Z- series 2-channel amp install kit Alpine - 500W class d digital mono amp Kicker - CS series 6x8 2-way speakers (x2) Metro - speaker wire harness adapter Signal processor Is this a decent setup? It comes it to 858 w tax. What happens to the door subs? They just get disconnected?