I think I bought the wrong amp for my subs.I have 2 12" p3 Rockford 4 ohm DVC subs.I bought a 500-2 punch amp and it gets hot after very little run time.I have the subs wired as a 4 ohm load.I was going to buy another 500-2 but I am not sure if that will work? I would appreciate any advice on this.