Just got my setup up running last week.
Squeezebox Server -> Squeezebox Touch -> Musical Fidelity M1DAC-A -> Bryston BHA-1 -> Bryston 4B-ST
I did not realize how underwhelming the BHA-1 was until I got my speaker tap cables from BTG. Electronic music just seemed too soft and distant compared to being hooked up to the speaker amp.
For those with WA-6SE amps, skip the HE-6. The HE-500s sound way better on the WA-6SE than the HE-6. The HE-6 deserves more.
FYI, I found my original test sheet for the amp. It clips at 300W and 301W at 8 ohms for each channel. I am just using 10 ohm Mills resistors in parallel for each channel.
The BHA-1 with the 4B-ST, I am only using no more than 1/12 of the dial. I am glad the BHA-1 does not have audio taper but a very gradual increase in volume in the first quarter turn.