I was wondering if any of you have ever had the rear 6X9's replaced through a Nissan Dealer. I had mine replaced (cost me a pretty penny) and they sounded good for the last 6 months and now it's like they don't hit at all. They sound really crappy to be honest. I don't know what to do. I don't think there's a problem with the head unit and I don't thinks the amps would cause this problem. I think I'm just gonna get new ones from davescoolstuff.com and see if that helps, but if any of you can offer advice or a solution I would greatly appreciate it.