Combined with the comprehensive controller functions of the Phonitor 2 (L/R phase reverse, L/R Solo, Mono, Mute) makes it the perfect analog 120V monitor controller.
Used reversely as 4 in 1 switch the Expansion Rack can also act as an inout switcher for four analog stereo inputs (Note that the XLR genders need to be reversed too).
The SMC 7.1 then offers connections and full control for up to four stereo speaker sets (Full Range, Mid- and Nearfield plus e.g. a single mono speaker) and a 7.1 speaker array.
Switching is done passive meaning that no power supply required or active electronics are in the signal path.