I have BP20s with a tube pre-amp(Audible Illusions)helps tame what I consider a harsh top end. Also use copper ICs and speaker cables, silver will only make them brighter. They like and can handle lots of power. I bi-amp and bi-wire them with 200 watt amps. Have tried strapping the amps in mono(600 watts)and running one per side, helps mostly in the lower range where you already have built in amps.
Good luck
Good luck