Thanks for all of the great information guys, I'm really learning a lot. One thing I have not done is put my meter on the power supply to see if the voltage is drooping at high output. I would bet the toroid is just fine, but the DC power supply may be reaching it's limit. I'll try measuring on both sides of the dc power supply to see if the ac or dc (or both) dips on high output. I'm kind of hoping the dc output is drooping because that may be able to be fixed with the addition of another dc power supply (use one for each amp board).


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