Is the Alpine PDX-1.1000 stable at 3 ohms? It does 1000 rms x 1 at 2 ohms and 4 ohms. I'm guessing it would at 3 as well. If so, would you say it is as good as compared to a JL 1000/1? I ask because the Alpine is significantly cheaper than the JL and if they are comparable then the Alpine would be the better deal. What do you guys think?