Gryphon vs. D'Agostino

First of all no tube amp that I know of can drive a speaker that presents a 2 ohm load in the bass and midrange area. They are not designed for this as you need current. I know I’ve tried many big tube amps including vacs and I still lose information in those areas with my Rockport speakers. So yes you need a high current solid state amp. I too have been to 23 CES shows. I’m not a solutions fan. I would recommend trying Dan deagostino, Nagra, Krell, possibly Gamut, Gryphon, Ypsilon, C H Precision, and Audionet.

I’d vote for Dan. My S250 has been flawless in all respects. FWIW

You are confused. No point in pushing this in any further. The M400 more than delivers its rated specs. It's not a debatable point; it's a fact.

They don't double down to 2ohms as you first wanted readers to believe, with these figures you posted

D'Ag does exactly the same thing. My M400s:
400 watts @ 8Ω
800 watts @ 4Ω
1,600 watts @ 2Ω

As I said they come close with these being the tested figures 
405W into 8 ohms
640W into 4 ohms
1115w into 2 ohms
And are still a good indication they can deliver good current, it not a debatable point it's fact as independent measurements confirm.

Cheers George

You're not getting it.  You need to do your research to properly understand what you are commenting on.  This is my final comment on this point since you don't seem to want to let it go.  The Stereophile review is of the old model M300 and not the M400 which is the current model.  Can you guess what the output of the M300 is vs the output of the M400? Hint - it's in the name. 

bar81, let me tell you 100%, no amp in can double it's impedance as you showed from 8 to 4 to 2ohms below. It's impossible as there are many losses. It would be like having perpetual motion which is a dream. 

D'Ag does exactly the same thing. My M400s:
400 watts @ 8Ω
800 watts @ 4Ω
1,600 watts @ 2Ω

Cheers George