So.. I recently purchased an Sa 12 D2 750 rms in a built to spec box tuned at 34hz. I’m using an audio controls LC1I LOC to tap into stock speaker signal going into a SKAR RP 1500.1 amp and I just don’t feel that the bass is there.. I’m not sure if it’s the amp or something else I’m missing, but the BANG just isn’t there....