I have a late model BP-20P, with the improved MPS-1 power supply and longer input and output jacks. I use it with a 3B-ST amp. Speakers are the Spendor SP 2/2. The roon is 17' X 14' X 8'. The sound quality is great. Solid, natual, and clear. I feel that using pre-amps and power amps from the same company make a lot of sense. They should mate pretty well!!
Pete
Pete