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dcongdon
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If I am reading the OP diagram correctly, Aux 2 is split for the drummer between a floor wedge and IEM system. Aux 2, Feed #1 is amplified but disconnected from the floor wedge (this means feedback at the drummer’s wedge is unlikely). Aux2, Feed #2 is sent to his/her IEM system, which should be isolated if earbuds are properly worn. Again, feedback would be very unlikely with earbuds.

If the feedback is originating elsewhere on stage (e.g. vocal mic), there is little you can do to remove it from just the drummer’s IEM. Obviously, the engineer can mute the auxiliary send level of the offending channel, but that is a last resort in most cases. My first concern is knowing what is causing the feedback and eliminating it. If you are primarily concerned with protecting your IEM users when feedback inevitably occurs (cause it will), then you have a few options.

First, I would insert a limiter on any aux send that feeds IEM users. This should protect them from spl spikes.
Second, you can insert a GEQ into an aux send that tends to cause feedback (closest to the problematic input source).

As far as using ME1s, feedback can still be an issue if the drummer has the offending channel turned up in his/her mix. The one difference with the ME1 system is that your drummer can set a Mix Limiter (I think it’s 7.18 in the manual…double-check to be sure) for his/her ME1. A limiter will not eliminate feedback issues, but it should reduce hearing discomfort. Sometimes, simply giving a performer control of their mix (like with a ME1), they will feel more comfortable transitioning to IEMs.

I hope this is helpful. If you can let us know where the feedback is originating (channel/input source) and if the issue is isolated to IEMs or all monitors, we might be able to offer more useful suggestion. Best of luck!

As an aside: I can say that the GLD series offers a lot of great mixing tools to combat feedback and the ME1 is a great add-on. We highly recommend it. Let me know if we can be of further assistance.

Daniel
Focal Audio & Design