Shure 1939 catalogue

Page 2

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Select

the Microphone First!

Sound begins at the Microphone! The ability of the
microphone to pick up and reproduce the sound you
want as you want it-to discriminate against unwanted
sounds-may mean the difference between a good or
bad sound system. Often, 90% of the difficulty in any
sound installation may be prevented or cured by the
use of the proper microphone. It is good sound prac-
tice, therefore, to select the microphone first.

9 Out of 10 P. A. Systems Need
a True Uni-Directional MicrOphone

With a true uni-directional microphone, you pick up
the voice or music of the performers-free from feed-
back, audience and background
noise, room reflection and reverber-
ation. And you can reproduce the
sound at considerably higher levels
than is possible with conventional
pressure microphones. Thats why
the trend today in Public Address,
Broadcasting and Recording, is true
uni-directional. Its the solution to
sound pickup problems that have
long troubled P.A. men in theatres,
night clubs, auditoriums, schools,
churches, outdoor spaces, and sim-
ilarly difficult acoustic locations.

What Is a
True Uni-Directional Microphone?

The cardioid-type true uni-directional microphone
is the most recent development for sound pickup work.
It contains a specially designed
mechanism which in effect is able
to distinguish whether the sound
wave is approaching the micro-
phone toward its front, or toward

the rear. Conventional pressure
microphones are unable to dis-

tinguish this direction of approach,
except to a limited extent at high
frequencies, since sound from the
rear flows around the case and
produces an effect similar to that of sound approach-
ing from the front. Cardioid type uni-directional mi-
crophones have a wide-angle front response which
diminishes sharply to a pronounced dead zone at the
rear. These directional properties are maintained over
a wide frequency range.

Cardioid
Pickup Pattern

7eedl'4k ' ' '

GO UNI-DIRECTIONAL

Shure Cardioid-Type
True Uni-Directional Microphones

Here you get all the advantages of high-quality true
uni-directional sound pickup at a cost low enough for
general public address
use. This is possible
only because of the ex-
clusive Uniphase prin-
ciple developed by
Shure Engineers. (For
complete technical in-
formation send for
Bulletin 163.)

Shure True Uni-Di-
rectional Microphones
have a cardioid pickup
pattern. They give wide
angle coverage with
excellent high quality
response at the front, yet are dead
at the rear. (Rear response down of
the order of 15 db average over a
wide frequency range.)

This simplifies the entire micro-
phone placement and sound instal-
lation problem-you can get the
sound you want without feedback,
background noise, or reverberation.
Close placement of microphone and
loud speakers is possible -- with
greater flexibility in the use of loud
speakers to cover the audience cor-
rectly-and at increased volume.
Room reflection pickup is cut down,
permitting placement of microphone
close to the studio wall. Shure True
Uni-Directional microphones make
possible satisfactory sound installations where poor
acoustic conditions did not permit it before-improve
coverage, volume and quality in practically every
installation using conventional pressure microphones.
All this has been proved conclusively by written re-

ports from Sound Men covering thousands of RA.
installations made with Shure Uniplex and Unidyne
True Uni-Directional Microphones.

Crystal and Dynamic Models

Shure Cardioid-Type True Uni-Directional Micro-
phones are available in Uniplex Crystal, Tri-Polar
Crystal, and Unidyne Dynamic models as listed on
next page.

GUARANTEE: Every Shure Product is guaranteed
to be free from electrical and mechanical defects for
one year from date of shipment from the factory,
provided all instructions are complied with fully.

Sound Systems Sound Better with Shure Microphones

The complete Shure line includes Crystal, Dynamic and Carbon Microphones, cardioid-type true uni-direc-
tional, general-purpose and Communications types-Microphone Stands and Accessories-Crystal Phono Pickups

-and other acoustic devices for special applications.