Hi Phil!
 Regarding loop systems, most used hereabouts any longer are IR systems
using an LED array at the front of the room and recievers used to tune
to them. Can be much better than a mag loop system and not cause
interference.
Trying to remember the name of the manufacturer of these systems, it's
been a few years since I've designed systems for large rooms with ADA
access requirements.
Bonnie *:>
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