Ya the problem with it shutting off is be caused by the amp getting too hot and going into protect mode. Ive never owned one of these amps (due to this reason) but i have done multiple installs using them and every single one will shut off a 50 mins to an hour and a half if your running it full tilt. Personally i would go with another amp. if you like audiobahn amps i would go with a one of the high current or the high current rack mount models. i own the the A2x600HQ rack mount and i can run that thing for 2-3 hours straight at .5 ohms full tilt with no heat problems what so ever. If your running 1 sub right now off that amp wired to 2 ohms to get 800 watts then you would have to have the dual 1 ohm model. if get antoher and have 2 dual 1 ohm subs then you wouldnt be able to wire them together to get a 2 ohm load. You could either wire them to 1 ohm or 4 ohms and since that amp isnt stable at 1 ohm you would have to wire to 4 ohms. Then your only getting a total of 400rms.
