After almost a year of running my sub off of my stock deck using the high level inputs on my rockford 300s i finally got a new CD player, a Panasonic CQ-C5410. I got it installed, speakers work fine (and sound wonderful compared to the stock deck), but my sub / amp isnt working. Its acting like its not getting any signal. The amp has power and turn-on signal (LED is ON). I have tested the sub and amp using a CD player and a mini jack to RCA adapter, works fine that way, so i know there is nothing wrong on that end. I have looked through the manual several times and havent found anything about having to "enable" the pre-amps or anything like that. The subwoofer level is set to +0 (not mute or anything like that).