Help with Clamp testing amp

[ShadowElky]

I was attempting to clamp test my amp earlier, its a Pioneer GM-D8601. The SA-15 its powering is wired to 1 ohm and being that the amp is rated 800w@1ohm and everyone says it will do rated, I am confused. I put on a 40hz test tone turned the volume up til I could hear the sub tone change, then backed it down 1 notch. At that point the voltage coming out the amp was 32.7 and the amperage (assuming I had the clamp set properly) read 8.4. Doing the math makes that only 275 watts. Yet if I use the other calculation for wattage (voltage x voltage ÷ impedance) it comes out to 1070. Which math is right?

BTW, the clamp I was using is a Klein CL2300.

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[adulbrich 5,000+ posts]

Rise and voltage drop will make your amp clamp less than "rated", unless you wire lower than the amp's rated impedance. The higher the frequency, the higher impedance rise is too. There's a reason people can wire crazy low for SPL burps. Rise is more at higher frequencies.