A:Answer You cannot have 4 transmitters to one receiver, but you can combine 2 systems very easily and inexpensively with the Saramonic AX1 mixer. https://www.saramonicusa.com/products/ax1-miniature-2-channel-3-5mm-microphone-audio-mixer-with-trs-trrs-output-cables-for-cameras-smartphones-computers-more?_pos=1&_sid=6dc76915e&_ss=r
It is extraordinarily lightweight, compact and an inexpensive solution.
