Dennis,

In nearly three years of using the L1 I have never had a feedback problem. I believe the reason behind this is first and foremost the type of mic I'm using. I currently use a Crown CM-311A headset mic, which during most jobs is just four-feet to my right and slightly behind me. Previous to using the CM-311A I used a Samson Q7, which is an outstanding handheld mic. I have also used it with the Countryman headset mics, and because of their unidirectional pattern they did produce feedback. I also had a problem with the SM58, but it was not as noticeable. Most super-cardiod and hyper-cardiod mics seem to work just fine. Unidirectional mics, even when used with conventional systems, seem to encounter feedback problems.

Good Luck,

Gary