I just put 2 10" Infinity Kappa perfect subs W/ a 400 watt kicker amp in and I need help getting the best sound out of them. Can anyone tell me where to set my levels on my head unit? Kenwood MP425. I don't know where to set the low pass and high pass filters. The bass kicks prety hard but I want to get it just right, any suggestions? The head unit can put power directly to the subs and has a sub pre-out function.