High cut is another name for low-pass filter. Crossover is just a term applied to a variable pass filter of any type (low, high, or band).
So that one dial is your crossover.
Another note: Dbl_D178's advice is good, but his approach is going for safe maximum.
In that case you should set the bass on the HU to max first as well, raise the volume until you hear distortion in your stock speakers, back the volume off, then turn up the gain to mild distortion and back off the gain.
No, the name has nothing to do with bragging about 20 inch wheels...
Last edited by CDubbs; 03-18-2013 at 12:33 PM..