measuring amp output without clamping it?

[detroitdiesel 10+ year member]

I was wondering if i would find the max output of my amp without clamping it? I would do this by measuring the AC voltage on the speaker terminals of the amp along with this formula..... voltage = sqrt( watts X ohms). By Using a 60hz tone -6db, couldn't i find my voltage at max gain, with bass boost turned all the way down, then fill in the ohms, with the resistance of the subs, and then solve for watts?

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[pheonix991 10+ year member]

That is basically what I did. Some amps won't output if there is no load though.