CAR AUDIO: Head unit is a Sony Mobile ES CDX-M770. The power amp is Sony Mobile ES XM-7557 which is a 5 ch. amp, 85x4 and 220 x1 @ 4ohm load, it is one ohm stable. I have Pioneer speaks in the front doors, Planet Audio Plates, VTX5702, in the back. The sub is a 12" Audiobahn Dual Voice Coil long throw woofer. 4 gauge wire for power, 100 amp circuit breaker, 12 gauge speaker wire throughout. Tsunami silver patch cord four way for the front and rear. Monster Cable for the sub.