Gryphon vs. D'Agostino

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

I guess Dan D'Agostino is lying to a lot of people. I am so disappointed now that my Progression monoblocks are not rated correctly (sarcasm)! I will call the factory tomorrow to confirm what you are stating is true. As you already know George these amps replaced the ARC Reference 250 SE tube amps which indeed sounded great on everything even old bright discs but could not drive the Maxx 3's to the levels I have obtained with the Progression series amps.

  

@georgehifi This is really getting to the point of wasting everyone’s time. Instead of admit that your comments about the M400 mono blocs were inaccurate (which I have tried twice now to politely point out) you now change the goal posts with a comment that: (1) is completely and utterly incorrect (and bizarre) and (2) undercuts your earlier praise of Gryphon that it amazingly could do just that - double in impedance all the way down to 1ohm. The M400 has been tested independently and meets the specifications of the manufacturer and then some; why you are so adamant to try to prove otherwise is beyond me. I really (hope) I am done now.

I’m not debating that the D’Agostino’s sound great, they do, and are fantastic amps.
But I’m stating your post of these doubling figures cannot be correct. If they were 5-10% of doubling there’d be no issue, as there are losses and these figures you posted are like saying Dan has solved Perpetual Motion, he’s good but not god.

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

Many manufacturers will understate the 8ohm figure to make it look like the amp can double all the way. This has been proved and commented on by Stereophile when doing their measurements.

Cheers George