I found pairing my BP6 with a 2B SST was a bit too clinical sounding and my McCormack DNA 0.5 RevA was a much better fit as it added some oomph and tonality I was missing yet retained the detail and transparency of the BP6. I’d highly recommend buying this excellent McCormack amp that your BP6 will likely love…
https://www.usaudiomart.com/details/649982529-mccormack-dna-225-power-amplifier-works-perfectly/
Hope this helps, and best of luck.