I just installed an Alpine CDE-102. When using the AUX input w/ Iphone or USB thumb drive with music on it, the sound quality is horrible. My 10" subwoofer is hardly even moving, if at all.
When playing the radio, sound quality is dramatically improved and my sub works perfectly. I usually though this happens the other way around....
Anyway, I just ordered a full speed ipod cable so I'm not sure how that will be.