Re: A few short, and one long question =) (n00b)
the hz knob is either the center frequncy for the bass boost, or the cross over frequency. But you should have bass boost off so that shouldn't make a difference. x-over is the frequency where it cuts out all sound above it, you wantit around 80. You can also use your HU for it, hit audio a few timse until the sub pops up, the hit up and it should turn to on. (You used rcas and the sub out preouts right?) you then hit audio again, and you can adjust how loud it is and whatnot, good luck.
Alpine CDA-7995, A/D/S 3 Series Comps, ED 8A, SoundStream Reference 604, 98 Civic Sedan