I just had my Alpine IVA-D310 the other day and I have a question. The sound of it sounds like crap. My speakers aren't sounding like they used to with the stock deck. I don't know much about the stock system, is there a stock amp that should have been plugged in? There is no bass what so ever! The highs sound like :q:q:q:qt to. I am clueless . Can anybody give me some information. Thanks.