I participated at an open jam last night. (Mo Jam at the Nectar Lounge in Seattle). I did well but at times had difficulty hearing myself.
A Violinist had an in- ear monitor system connected to a switch box (8 switches on a box on the ground. I did not get a chance to photograph it). His mic was connected to that and that then to the DI box to the mixing board. A wireless transmitter was connected to a monitor out on the switchbox.
I was wondering if anyone reading this used similar setups and could make some recommendations.