Usually too much bass. I have to turn the sub output down to almost nothing because of the level that I prefer to have it. Now some songs requires turning it back up to about halfway. Just depends on the mix of the song and my mood, but yeah, there is Plenty of bass even with the passthrough closed and two big amps (that might pass as a fire wall) there too.
500 mono watts to the sub. 150w to each front channel xover, and 75 to each rear channel xover.
And it, like my engine, is not tuned very well, but is VERY enjoyable!