Using two EX20s in mono: A single mono signal (bus or aux send) is routed from a mixer to one EX20’s XLR input, and
a connection is made between that EX20’s XLR output to a second EX10’s XLR input.
Using two EX20s in stereo: A stereo signal (bus or aux send) is routed from a mixer, with the left side connected to one
EX20’s XLR input, and the right side connected to the other EX20’s XLR input.