Currently listening to A21se Sig and Devore O93's playing Satie Piano Music on Qobuz. Its wonderful. I also have a pair of Spatial Audio M4 Triode Master that are also wonderful with the A21. The M4 when available used can be purchased for a lot less. Even though I have not had Proac speakers paired with my A21, previous time spent with that line makes me think it would also be another good match.