A: The WM60 mono wireless transmitter can be used in conjunction with any mixer without a problem (as long as the signal isn't active, of course). The WM-SYS2 wireless kit is a good option for a set up with two performer speakers, as this will allow you to send a stereo signal to the left and right speakers. The kit comes with the WM70 transmitter and two WM-40 receivers (one for left, one for right). If you've already got the WM-60 transmitter (which sends out a mono signal), you can actually just buy a second WM-40 receiver and you get a dual mono system. Any number of receivers can be used, provided they're within the transmission area.