The B2 will only output in the following ways.
1. Speakers hardwired to the B2
2. Analog line out
3. Optical Out (SPDIF/Toslink)
4. Bluetooth out (note that this is no longer officially marketed as a feature but does work for a number of Bluetooth enabled speakers)
5. Sonos
So your non-Sonos options are limited to 1 thru 4
You could connect the B2 to an external amplifier/receiver via 2 or 3 that can then output using another wifi based technology to suitable speakers e.g. Yamaha Musiccast, Denon Heos , PlayFi etc.
John