There is so much fail going on here OP. I don't think you ate understanding all of your set up. You have two dvc 4 subs (it's dual BTW, not deul or duel), right? You can't run them each at 4 ohms. You could run the pair at 4ohm (series) or 1ohm (parallel). You can run one sub at 8ohm or 2ohm.
So your Amp is going into protect because you are running it at 1ohm most likely and most alpine stuff isn't stable that low.
You do not have 2 500w channels. You have a mono block amp, that means 1 channel. 1000.1 that one at the end means 1 channel. Two sets of speaker terminals doesn't equate to two channels, it's only 1 channel those terminals are internally connected. So you should have probably got dvc2 subs so that you could wire at 2 ohms, but for now if you don't want to fry your Amp, you should wire in series @4 ohm or just run 1 sub at 2ohms.