I'm currently using 901's (series 2 without the equalizer), Boston Acoustics 525V for center channel, Boston Acoustics VRS side surrounds, a Boston Acoustics 595V (unpowered) and an M&K V75M2 powered subwoofer. They all work very well together. Having been at this for a long time, I'm still driving the six unpowere speakers with three Dynaco Stereo 120's.