Do CEA Compliant amps test all ohm ranges? or just 4 ohms? I ask because I wanna buy an amp that says its cea compliant and the ratings are for it 800 at 4 ohms, 1600 at 2 ohms, 2400 at 1 ohm. It seems kinda sketchy that the wattage would double going down 1 ohm. That's not how ohms law...