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Topic: Hearing Assist -- FM vs IR
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Frank Angel
Film God
![](http://www.film-tech.com/ubbmembers/248b.jpg)
Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 03-19-2010 05:15 PM
We need to reinstall a Hearing Assist system in our large house. Problem with the original IR system was that it had tons of dead-spots, even though ugly IR transmitters were placed around the walls, the coverage lacked uniformity. To compound the problem, it is a slope floor, not a stadium in the orchestra so the receiver could easily be blocked by the person sitting in front, especially when cloats and such are hung on the seats.
This time we are looking into an FM type system as well. It would seem that these are much easier to install (simple antenna mounting in only one place and they claim 3000ft coverage) and no problem with line-of-sight issues. On the other hand, it is RF and with that can come some pretty serious transmission interference. However, my understanding is that since the FCC reallocated radio frequencies for specific commercial useage, the cross traffic stepping on each other is much less of a problem these days.
Does anyone have any experience with an FM being used theatrically? Anyone know of theatres that use the RF type instead of IR and what do you think of it. We would like to be able to talk to an end-user to hear their practical experience with such a system.
I am thinking there must be a reason why so many use IR as opposed to RF, but as far as simplicity goes, the FM transmission seems to win hands down, not to mention that it is much cheaper that IR in terms of installation. That 3000ft coverage figure seems a bit high to me and any time a manufacture claims transmission distance, I always figure halving that number would probably be more accurate. Still 1500ft would be more than enough for what we need.
Here is one of the systems are looking at: ListenTech FM Hearing Assist System
Thanks for any ideas about this.
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