Shure SH55 Series II [6/48] Historical origin
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Shure SH55 Series II [6/48] Historical origin

Shure SH55 Series II [6/48] Historical origin
4
© 2014, Shure Incorporated.
HISTORICAL ORIGIN
I
n 1939, the original Unidyne became the rst in the 55 Series. Using the proprietary Shure
“Uniphase” acoustical system, the Unidyne was marketed for broadcast, public address, re-
cording, and two-way radio. It was sold in three congurations, each with a different impedance
option. The Model 55A was low impedance for broadcast applications; the Model 55B was medi-
um impedance for public address and recording applications; and the Model 55C was high im-
pedance for two-way radio applications. List price in 1939 for the 55A was $42.50 (U.S.), while
models 55B and 55C cost $45. Catalog copy proclaimed that “you get the sound you want, as
you want it.” It was, “the rst high-quality, low-cost moving-coil dynamic microphone with true
cardioid unidirectional characteristics.” The Unidyne reduced the problems of feedback, back-
ground noise, and reverberation.
Shure literature touted
the advantages of cardioid
unidirectional microphones,
which “give wide angle
coverage with excellent
high-quality response at the
front, yet are dead at the
rear.” Even today, a Uni-
dyne Microphone is often
the rst choice in difcult
acoustical situations.
Shure engineer Benjamin
Bauer was the driving force
behind the development
of the rst Unidyne. Bau-
er began developing the
microphone in early 1937.
In undertaking the project,
his primary objective was
to create a unidirectional
microphone using a single
dynamic element. Before
the Unidyne, the most
common way of creating a
microphone with a cardi-
oid response was to use an
omnidirectional (non-di-
rectional) element, com-
bined with a bidirectional
(“gure-eight” pickup
pattern) element in a single
housing. When the outputs
from both cartridges were
electronically combined,
the result was a cardioid
pickup pattern. Other
directional patterns could be obtained by altering the relative balance of the two cartridges with a
multi-position switch.
Technical explanation of the Unidyne Microphone
authored by Ben Bauer in 1938

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