Here's what I have hu - Kenwood Excelon KDC-X789amp - Kicker 04KX650.4 - Kicker 4 Ch. 650 Watt Amplifier I had all four speakers running off the amp but i just was given a Infinity sub . so i hooked it up to test it out and with just the front speakers and sub hooked up it sounds good. Is it possibl...