Just turn on the high pass filter (HPF) and set the cut-off frequency to something your speakers can handle. If you hooked the sub up to the sub pre-out, the HPF will only affect the internal amp and front/rear preouts.
Out of curiosity...how is the Ipod connection that you mentioned? I've heard that it is very slow when displaying info from the Ipod on the Alpine display and I wanted to find out for sure if that is the case.
I read about the HPF but I am still unsure how to turn it on.
Ipod - Runs fine. The display is typical speed, not too slow, but not blazing fast either.
I have XM on it also, and that is painfully slow to display artist, song, album information. It is really very annoying. My last Alpine with XM was extremly fast displaying XM info, not sure why this one is so slow.