At my high school, a sound system was installed at the bare minimum, and being a lighting person with very little sound knowledge, I had never taken a good look at the system. There are two modules in the "rack," if can call it that, which are "Auditory assistance modules," one of which has an antenna that is wired on top of the rack. The other module has audio inputs (which I'm not sure where they go to), which has set-able frequencies (I think). We have no auditory "receivers" for the hearing impaired to use, and the two modules have no power. There is no power cable run to them. Also, isn't an Audio rack usually in the booth? Ours is backstage... even though the sound board is up in the booth... Can somebody explain this to me?