What frequency range would one use to setup the amp for their sub? I used 30-39hz and set it to a solid 28.7/28.8 (800w) volts (AC). I then used the 90-99hz range to set the LPF on the amp. The sub is a 12" FI SSD (800w RMS) and the amp is an Orion 1200D (1200w RMS). The system absolutely pounds, but I just want to make sure that I did it right.