I have the factory stereo hooked up to a line out converter through the rear speakers...the system was working fine two days ago til I tried to adjust the xover on the amp. Now whenever I attempt to turn the volume up the amp goes into protect mode. I checked all the wiring and grounds and everything is fine. I even went out and got a new line out converter but it still does the same thing. I thought it may be the amp but I then tried to hook up my old amp and I still was getting no sound from my sub. Even when I adjust the signal on the line out converter I have to turn it all the way down to have the amp from not going into protect mode. Someone have any clues help me please!!!!! Here is the system in my Nissan Xterra 2001 6 disc in dash factory reciever 6.5 x2 Audiobahn component speakers 6x9 x2 Blaupunkt rear speakers 6 tweeters 600w Jensen mono channel Amp 10" Xplode bandpass sub 1.2 farad cap 1 inovatek line out converter