Good Day
Thought I would share this idea. It may be agricultural but practical.
Requirements Marshall MS-2C clip amp TSR 1/8" to 1/4" adapter, Cell phone or I-pad earphones.
The Marshall is belt clippable and powered by a 9V battery. The only down is that the out is in mono
Hook up to mixer with a TSR mono going into the input jack of the marshall, set sound volumes for mix and monitor through ear phones with personal preference adjustable on Marshall volume control and voila!