[happyopossum]

Uhh, no - you run 110 to the symfonisk, and run 2 pairs of speaker cables to the bi-amp speaker.

[perrylaj]

Oh, I understand. For some reason I was thinking self-powered (internally amplified) speakers that were being driven by a line-level source off the Sonos. Not sure why that's where my mind went, but appreciate the clarification!