I just finish the install of the headunit in my tib and I was wondering where did you guys installer the main controller which is quite big. Anyway I just put it by the passenger seat for now until I found out from you guys the best spot.
I have the same headunit as you aswell and my subs worked fine.
did you make sure that the sub level is up on the headunit?
also are you sure that the amp is on? or working?
you also mentioned about a ON/OFF switch, now is that for the amp? and did you wire that correctly?
Just to let all know, the problem has been fixed, it was something wrong, but not with the unit. The on/off switch you mentioned that he speaked of, is on the bottom of the brain to the IVA-D300. It switches if from RCA outputs, to high outputs (the speaker wires), newer Alpines do it internally, helps let the machine run cooler if your not using the high outputs, no amp is on! L8R