I've got a kicker kx800.4 that i think has some type of shipping damage (ie. worked fine when shipped to customer, didn't work on arrival, fedex payed up, now I'm back with non-working amp). The amp turns on but doesn't have any output. The amp doesn't go into protect mode either. I've tried several audio sources (ipod, two recievers, HT reciever) and no go. I pulled it open to see if anything got loose during shipping but could push or pull anything back into place. I've had this repaired at kbaudio for a similar problem before...The amp had been having problems staying on. Would turn on and off at odd times. Most likely I'll sell it as is to somebody who wants to repair it (probably sell it for 40 plus shipping).