The MS6R from Coleman Audio is a passive stereo 6-way speaker switcher  1 x balanced stereo source  6 x balanced stereo speaker set selection  chunky selection buttons  an interlocking switch assembly only allows one set of speakers to be selected at a time, when not selected the input to the powered monitor or amplifier goes to ground assuring no extraneous noise makes it into the speaker system 1U.  XLR I/O.