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Ok, so I’m attempting to actually do this somewhat correctly and use my DMM to set my gains. if I use this method For my cab-22, which is 2200 rms at 1 ohm, I get 46.9 volts

my bigger question is this though, my cab-22 is .5 ohm stable, but I can’t find how many watts rms it puts out under those conditions. but even if I make an assumption of 2500 watts it doesn’t seem right the square root of 2500 x .5 equals 35.3 volts

why do the gains need to be set at a lower voltage? Is it because of the change in ohms from 1 to .5? I’m guessing? Sorry, I don’t know much about electricity.
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I think you’ll be fine setting gains with the 1-ohm numbers, then just wire to 0.5 (and understanding any risks of doing so) when it comes time to hook up the subs.

I don’t ever wire below rated stability myself, so I’m happy to be corrected by someone more knowledgeable.
 
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