If you plan to run a 1501 at 1ohm and dont have the electrical to back it up you will be constantly getting it repaired. I have mine running at 1ohm with 1/0, big 3 in 1/0, and a stinger spv70 and have no dimming at all. You just have to be very careful with them at 1ohm though. I also heard and seen supposed results that get around 1800-2200rms out of a 1501 which is also at 14.4. But with you're electrical listed in the sig you should be good on 2 1501's at 2ohms at least I would think.
But like I said, just be careful with a 1501 at 1ohm because they will burn up in a heart beat. I've been running mine for 3 years at 1ohm and only had to get it repaired once due to a different issue with RCA's. Great little amps though I just bought a Thunder 4202, have a Thunder 4122 in the car now, a Thunder 4200x, and a ton of 1501's lol.