does you amp have the setup to add speaker level input ...like to tap in to you speakers to get the signal... if so try it .... I've seen subs hit harder that way I forget the reason I remeber someone telling me that it was the rca outputs being bad or two other things that I can't remember I need to stop drinking

We had two bags of grass, seventy-five pellets of mescaline, five sheets of high powered blotter acid, a salt shaker half full of cocaine, a whole galaxy of multi- colored uppers, downers, screamers,laughers... Also a quart of tequila, a quart of rum, a case of beer, a pint of raw ether and two dozen amyls.