No, you won't be able to use four 791 speakers with a single Connect:Amp. The
Bose technical details (last page) say that the 791 model speakers are 6 ohm speakers. In order to
connect four speakers to the Connect:Amp, they need to be 8 ohm speakers.
The 591 model speakers are 8 ohms, but not the 791's.
What are the specs for the Bose 791s? A Sonos CONNECT:AMP can drive a pair of 8 ohm rated speakers.
