i have installed the whole system, and its working for me, not as good as car woofer and amp, but far better then normal car speakers, at least it has amp like effect lolll. i placed the 2 front speaker beneath the front seats and the rear speakers and volume control unit on the top of rear speaker board and the base unit is in diggi, the 12VDC-220VAC along with 220VAC-120VAC Adapter is also placed under front passenger seat. works for me.