I'm using the Ref 7.1 as my source.
Currently using the WA22 as my main amp to drive the HD800 and LCD-3. Sounds spectacular with upgraded tubes. Wonder how much the GSX will improve on my current set-up.
That said, I have heard the BHSE and 009 and the resolution, detail and transparency was amazing. This is the sound I'm striving for in my setup, although I know that stats are on another level altogether and may not be achievable with dynamic cans.