Slaughter wouldn't be an accurate description of the outcome once I got the Phoenix into the mix. Once balanced, and into the Phoenix, the Bryston closed the gap on the Reference 7, to the point that I would have had been quite happy with that combo. I opened up the Bryston and confirmed that there was no summing of the balanced signals, so the Bryston, as the Ref 7 ran optimally balanced. The Bryston suffered drastically when single ended, the Reference 7 did not.
It was when the studio/professional orientated Bryston was initially paired with the studio/professional Lehmann amplifier single ended, that the Reference 7 held a significant advantage over the Bryston, as the doubling up of studio type signatures were not very synergistic IMO.
To sum up my experiences with the two,
subjective and individual preference differences, IE, tonal differences:
The Bryston had a darker treble, a cooler midrange, less overall bass presence due to a subbass that isn't as pronounced as in the Ref 7.
The Ref 7 had a brighter treble, a warmer midrange and a subbass that was very noticeably more present than the Bryston.
I can also summarise this to say that female voices sounded "younger" with the Bryston. With the Phoenix amp, I am fine with either presentation...with the Lehman amp also having a cool midrange doubling up on the Brystons cool midrange...the Ref 7 was vastly preferred...these are in my preferences....which always favour warm audiophile grade type signatures over cool professional grade type signatures. In fact with the Phoenix in the chain, there were pros and cons to the Bryston and Ref 7...in pure tonality...I had no preference for either...both sounded very nice and free from digital glare, which for me is priority 1.
Now onto what I felt were technical aspects, differences that remain outright and IMO are a little more objective and is not a personal preference issue (however personal preference will still easily override these technical, more objective differences):
I can easily discern better dynamics, a blacker background and better bass control on the Reference 7. Moreover the Reference 7 has a more 3 dimensional, wider and more spacious soundstage with better layering and separation of left and right channels. Differences are not huge, only slight but for me was very noticeable.
The above reasons are the only reasons I sold the Bryston and kept the Audio GD. If the Bryston had equalled the 7 in the above technical benchmarks I would have kept it, as I have no preference for either dacs tonal presentation, which means the decision is based purely on the "Bryston" legacy...also the Bryston has a level of manufacture a league above the Audio GD products. However, IMO, the Audio GD is a better electronically engineered product and hence the Bryston went up for auction on ebay.
This is all coming from someone that likes NOS dacs and tube amps with HD650s and LCD2s.