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XENYX 1222FX
Fig. 4.1: 1/4" TS footswitch connector

4.2.1 Audio connections

Please use commercial RCA cables to wire the 2-track inputs
and outputs.
You can, of course, also connect unbalanced devices to the
balanced input/outputs. Use either mono plugs, or ensure that
ring and sleeve are bridged inside the stereo plug (or pins 1 & 3
in the case of XLR connectors).
+Caution! You must never use unbalanced XLR
connectors (pins 1 and 3 connected) on the MIC
inputs if you intend to use the phantom power
supply.