Humm, how do you have everything set on your amp?
Volume on the head unit is usually between 24 and 32. Louder when using the tuner or with certain CD's.
I have my sub level on my HU at -10 (goes from +6 to -24). Then I can go up or down from there, usually around -8. LPF @ 100hz. Was at 80hz. Just trying to see if it would mix with front speakers better like this...
The gain a little less than half. Like one notch down from half.
The xover past half way (I use the LPF on my head, so I figure the one on the amp is useless.)
And the bass boost just over half (a little past one notch up from half)
SSF is off
EQ is as follows (as best I can remember): +3, +6, +5, +4, +3, +2, +1, 0, +1, +2, +3, +4, +3, +4, +3, 0. Actually, I fooled with it a bit today and I can't remember where I left it. Mostly the highs because this one CD was killing me on the "Ts" and "Ss."
BMX1
BBE "ON" +2
HPF front spk 100hz (was 125hz), 12db
Loudness is off
SLA +2
Can't think of anything else. I don't guess the wiring could effect this. I haven't upgraded my 4ga from the battery yet. Will be doing it this weekend to 1/0. But it's a 4ga from the battery (100a fuse) to block. 4ga to zx750.1 I don't know if maybe this could be a problem or not.