“As an engineer, I think I've ran monitor mixes using every ETL mic at some point. The main factors are the room, the EQ, & time. Milk Carton Kids will have nice quiet crowds, 100-band EQs and plenty of time at soundcheck. On the other end of the spectrum it might be a noisy bar where people are talking over you, and you had a flat and showed up 10 minutes after you were supposed to start. Some nights it will be easy, some nights it won't. That's the grind! If you have an engineer ask them if they can "ring" the mic. We love doing that! If you are running your own sound, first thing to think about is speaker/mic positions and reflections. Slight tweaks in the angle & position can make a big difference. Ideally you would have access to a parametric EQ, and you'd turn the mic up very slowly til it starts to ring and then make a narrow cut to the frequencies that feed back. You don't want to go crazy with it, just cut the first few that pop up. That should get you there. A trick if you don't have a fancy EQ, is to use a frequency analyzer app on your phone to find the frequency to cut. I use one called FrequenSee.”
–Eric Lucas