The new band I joined uses IEMs, and I got a pair of Westone UM2s. Our sound guy sent me a youtube video on making your own custom earpieces from the Radian "mold your own" shooter earplugs (cost is about $10). This is designed for shooters, and full earplugs are rated at -26 decibels. You follow the instructions for the plugs, but while the stuff is drying, you put in the earpieces. I made them this afternoon. It's interesting, and the pieces are still curing. After our next rehearsal Thursday, I will let you know how it goes.