Ive had an Alpine in my truck for about 10 years, and just recently updated. LOL - Looks like this \/\/\/\/\/
And on mine you could change the high pass and low pass crossover settings, the subs phase, and the subwoofer level. Again Im not sure if they are the same, but after turning on the sub outs - the subwoofer level was accessed by pressing the volume button in. (Same menu as treble/bass/fade/blah)
Not sure if this will help, but my experience with Alpine anyway //content.invisioncic.com/y282845/emoticons/up2something.gif.dd110ecf3ae4b76050d87598f2f8de7c.gif