Definitely a dynamic amp.
That thread linked by Grahame is interesting. The design process of this thing seems odd. They are prepared to release, pull it to change design, then apparently pull again to tweak circuit. All good if they get it right, but still. Then Bryston acknowledges that they are aware most balanced HPs are male XLR, which is the main reason for the retermination service. WTF? Why not just go with female?