Owner`s manual

p.45
Master section
3
Rear panel features
Solo Link
When using multiple X-Rack mixers together, the solo systems can be linked.
A 5-pin DINcable is used to link the Solo Audio and control signals.
AC Input
The XR-20 and XR-24 use an internal switching power supply which is capable of
accepting a wide range of line voltages. This industry-standard IECconnector will
mate up with any of the common IECline cords. The in-coming voltage can be
anywhere between 100 and 240 volts, +/- 10%. The AC frequency can be 50 Hz
or 60 Hz.