1556 Chapter 42
with the patron’s T-coil. Most users report a strong pref-
erence for the dual earpiece instruments and also report
a strong dislike for an over-the-head-type headphone
because they are uncomfortable for long periods of use
and destructive to hair styles. Two types of induction
loops are available. One is a small coil that hooks over
the ear close by the hearing aid; this type is often hard
for elderly people to use properly. The more popular
loop is a lanyard type that hangs around the neck and
may be used to support the receiver.
Many theaters and churches that have installed a
system for the hearing impaired have found
normal-hearing patrons using the system to enhance
their listening comfort, which is especially true in larger
houses with seats in areas of poor natural acoustics.
These normal-hearing patrons universally prefer the
dual earpiece both because it sounds more natural and
because a single earpiece leaves one ear open to receive
the live sound from the stage with a signal-delay annoy-
ance. Depending upon the distance from the stage, thisFigure 42-18. Typical infrared system theater installation.StageWall or ceiling
mount emitter
SeatsSeatsSeats SeatsSeatsMaster
emitterMaster
emitter12,000 ft^2 Two channel2500 ft^2 Single channelStage20,000 ft^2 Single channelRemote
emitter
slaveLarge
emitterLarge
emitterMedium master
emitter
Medium slave
emitterMedium slave
emitter1620 ft^2 Stereo systemDaisy chain slavesDaisy chain slavesRemote
emitter
slaveRemote
emitter
slaveRemote
emitter
slaveDaisy chainSeatsScreenProjection1500 ft^2 Single channelLarge slave Large slaveWall or ceiling mountMedium area
emitterStageBalconySeats Seats SeatsSeatsSeats
SeatsOrchestraSingle channel
large area emitterLarge area
emitterLarge area
emitterLarge area
emitterLarge area
emitter
Medium area
emitterMedium area
emitterDaisy chain emitters40,000ft^2 Single channel