Wait a minute; I think I know what you’re talking about. Before you sell anything try this, my single ’10 Infinity hits hard, I can’t image dual ’12 not rattling your teeth. If you have a LPF option on your H/U try this.
Set it to 80 (or what ever your lowest setting is)
Set your amp to 85
Set your gain at the 3rd dot
Play with the bass boost a little
When I left my Alpine’s LPF to “flat” which what was suggested to me my sub sounded weak. I turned up the gains, bass boost, and the LPF on the amp but it didn’t really help. Then I started screwing around with the LPF on the Alpine and BOOOM! Now I can feel that single ’10 and it sounds great. Good luck!