I need sound deadening!!! I played with the crossover points (now around 45hz) and played with the gain. I can now audibly and physically shake the roof 1/2" or so, it resonates HORRIBLY but the bass is DEEP and CLEAN. The JL 13tw5v2-2 on the Rockford 1000 amp is HOLY CRAP loud (for my old ears). Still have to install the processor, top end amps and speakers but the bass is loud, my thoughts of doing a blow through are gone, no need at all. I can probably do a custom box full width around 3" deep for these two drivers and then build a custom amp rack above or below to make everything clean.