Kenwood KSC-SW10 not enough...at all

threeseventy

It sounds like 2 things are wrong:

Maybe the 180 degree phase-inversion button is pressed, which really only helps songs with mid-bass hit but ruins anything with low freq boom or bump. Make sure that is off if the speaker is behind your seat.

Also- You said you "turned the sub output off to test the door speakers." I think it should be wired like a normal speaker, it's hard to do it successfully without filters if you are using a preout, and they don't recommend any preout with fader. You may be throwing too much amp'd sub sound at it when it expects relatively normal sound that it can convert to bass. IMO you shouldn't double dip with these powered subs!

What is your per-channel output on that Pioneer? I kept stock head and amped the DB6501's with 50w to each side. Big set my amp gain to "stun but not kill" with stereo full blast, and it is plennty, even with windows down going around Willow Springs at 80-140mph with Beastie Boys (RIP MCA!)