Very excited about the BHA-1. I am a long-time Brystonophile -- I have the BPA-26 (w/MPS-2) & 4BSST for my living room setup. In my office I currently use a HeadRoom Max Balanced Headphone Amp which I use with balanced AKG-701s and also connected to a pair of Dynaudio BM6 MKII monitors for nearfield listening. I have a Transporter for each setup (purchased in Bryston's pre-digital era).
The HeadRoom amp is really a wonderful piece of kit -- it's been on pretty much every day for the past six years. Sadly, it's been discontinued and I'm delighted to see Bryston step up and fill this gap. I think every music lover should have a high-end balanced amp like this. Nothing beats it in terms of $ per audio quality/listening enjoyment.
I was really pleased to see that you added a pair of Balanced Outputs to the back of the BHA-1. However, I noticed that there isn't a switch to turn the rear output on and off. It's kind of nice to have this to switch to a headphone-only mode without having to reach around and turn off the monitors. Just an idea for your next rev.
Anyway, congratulations on what looks to be a beautifully conceived & executed product. I can't wait to get my ears on one.
Best,
muski