-------------- Revision to my post above ---------------

The bold portion should read:

So if you were to ask me how this amp would perform with an M80, I'd have to use the EIA spec to give you an answer. At 1KHz the M80 impedance is about 12 Ohms. So I'd say that it could source about 400W at 1 KHz with no more than 1% THD. Although this sounds very respectable, I'd like to understand the FTC rating before passing any judgment.