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NOW AVAILABLE
One of our most popular sellers THE WENZEL SHOCK-ABSORBING
INTERMEDIATE GEAR
for all Standard Projectors
(PATENT PENDING)
To keep your present equipment operating smoothly until the time when our new projectors are available, use Wenzel quality, precision projector replacement parts. Send for our catalog. Mention name of dealer who serves you.
of an overload or under-voltagc supply in the a.c. feed line.
It is very important that the system be grounded properly by running a No. 10 braided rubber-covered wire in ^-inch conduit
number can be planned for installation to fill requirements, but they should be so placed that they are well beyond the face of the public address speakers. This precaution is to eliminate any possible feed-back from the
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FIGURE I. — Installation layout of typical theatre public address system.
to the nearest cold water pipe, where a secure attachment should be made.
In locating the floor outlets on the stage or screen platform for the microphones, any
FIGURE 2. — Speaker location.
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speakers to the microphones. These floor boxes should be installed a little below the level of the floor, and in them should be attached flush floor receptacles of polarized non-interchangeable type with matched impedance. However, the exact type of "mike" receptacles will depend on the kind of equipment used.
MICROPHONE INSTALLATION
The microphones can be either of the cardioid or crystal type; their selection will depend on the kind of performances they are to handle, the size and shape of the auditorium.
For interconnecting the. microphones with the amplifier, a special microphone cable should be run to each floor receptacle with the shield of the cable microphone cable soldered securely to the terminal on the receptacle, and to the prong on the male plug.
Where a lapel microphone is to be used so that the speaker can move about without holding a stand microphone in his hands, an outlet should be installed on the stage ceiling, or on top of the prosecenium opening. From the amplifier to this outlet a microphone cable should be run in a j4-inch conduit, then attached to a spring roller — similar to a reelite in the projection room — having about 30 feet of flexible mike cable. The connection from this cable to the lapel mike should be made very carefully.
In larger theatres having stage perfor
BETTER THEATRES, APRIL 28, 1945