Sonos will soon release a firmware update for its ZonePlayer S5 speaker system that will allow two of them to operate in a stereo system, each designated as a left and right channel.
The feature is a slick way for users who have multiple S5 units to combine two speakers when they want better sound and then return the individual units to stand alone mode when they want music in multiple rooms. The speakers are synchronized to prevent any latency issues when used in stereo pair mode. The new mode will be offered in the 3.2 software release set for this month.
Take a look at Sonos ZonePlayer S5 Review video,