I've checked out most of the reviews on the other amps already. Was hoping the 7500 and 7700 had been reviewed by now, but as you say perhaps soon there will be some published. I had read your review with great interest about how the audio quality had increased detail and clarity compared to your Model 200 monoblocks. How about imaging and soundfield? Do you have any observations about this for 2 channel music listening as compared to your 200 & 770 amps?
I had a chat on Friday with Steve from Outlaw discussing the 7500/7700 amps. I knew the inputs were bal and unbal, but I hadn't realized that the outputs are also differential as well. Steve cautioned that downstream attenuators and switchers could not be connected to the outputs for obvious reasons of shorting the -ve terminal which is not a common ground. Were the 750, 755 amps a single ended output or balanced? I think they were single ended from the info I read.
In closing, balanced outputs are not too common a feature to find on amps the price of the outlaws so I am curious what the pro reviews have to say about these 2 amps?