You might want to look at past The Absolute Sound write ups on the SP 1/2 by RE Greene. He used them as his personal reference speakers right after his Quads and before his Harbeth Monitor 40s. (Dr. Greene always measures, and graphs, the response of the system he is reviewing.) I have read him comment on using the Bryston 4 BST and the Quad 606 amps during that time, I am pretty sure.
Good luck from another BBC fan.
Harbeth Charlie [:)]
Good luck from another BBC fan.
Harbeth Charlie [:)]