i have my subs bridged and my amp is 500 watts bridged at 4 ohms.my subs are bridged at 4ohms.i set my gain using 60hz tone,and my bass boost on hu is all the way up and bass is +8 and volume is 28 out of 35,but still not enough bass???,,,what can i do to fix this??? i figured my voltage by 500 watts(amp) and 4ohms subs,,500x4=2,000+sq. rt.=44.7volts,but not enough bass for me????/