UNIDIRECTIONAL DYNAMIC MICROPHONES
General: The Models 55S and 55SW are extremely
rugged microphones built to provide wide range re-
production of music and voice. The Cardioid unidirec-
tional characteristic of the microphones provides
highly satisfactory operation under adverse acoustic
conditions where omnidirectional microphones may
not operate properly. These microphones can be used
closer to loudspeakers than usual, without creating
feedback problems.
The Models 55S-Gold and 55SW-Gold are identical
to the Models 55S and 55SW respectively except
Models 55S-Gold and 55SW-Gold have gold finish.
The Models 55S and 55SW are ideal for high quality
public address, theatre-stage sound systems, remote
broadcasting recording applications and other sound
applications such as those used in hotels, stadiums,
and public auditoriums.
The microphones feature:
OPTIONAL ACCESSORIES
n An effective cardioid directional characteristic
especially adapted for optimum performance in
adverse acoustic environments.
Line Matching Transformer.......................................A95A
Vibration-Isolation Stand...........................................S39A
Desk Stand..............................................................S36A
Quick-Disconnect Isolation Unit ........................Model A47
Carrying Case............................................... Model AC55
n Response effective for announcing, narration,
vocal music, and combo groups.
n Cartridge shock mounted for quiet operation.
Guarantee: This Shure product is guaranteed in normal
use to be free from electrical and mechanical defects
for a period of one year from the date of purchase.
Please retain proof of purchase date. This guarantee
includes all parts and labor.
n A strong detachable cable especially selected
for good shielding from “hum” pickup.
n Very rugged mechanical design for reliable oper-
ation under severe conditions of use.
n A self-tensioning swivel permits tilting through
45° forward and 80° backward.
Shipping Instructions: Carefully repack the unit and
return it prepaid to the factory. If outside the United
States, return the unit to your dealer or Authorized
Shure Service Center for repair. The unit will be
returned to you prepaid.
The Models 55S and 55SW are multi-impedance for
connecting into microphone inputs rated at 25 to 50
ohms, 150 to 250 ohms, or into high impedance micro-
phone inputs.
MODELS 55S AND 55SW
The low impedances are recommended where long
cable lengths are required or under conditions of
severe hum disturbance. The permissible cable length
is practically unlimited, since neither response nor
level is appreciably affected. For use with high im-
pedance amplifiers. Shure Model A95A Line Matching
Transformer is available for coupling the low imped-
ance line to the amplifier input.
ARCHITECT’S SPECIFICATIONS
The microphone shall be Shure Model 55S, 55SW,
or equivalent. The microphone shall be a moving coil
type microphone with a frequency range of 50 to
15,000 Hz. This unit shall have a Cardioid horizontal
polar characteristic. The cancellation at the sides shall
be approximately 6 db and the cancellation at the rear
shall be in the order of 15 db. The microphone shall
be equipped with a three-position impedance change
switch for adjusting the microphone rating impedance
to 38 ohms, 150 ohms or 40.000 ohms. The Model
55SW shall have a built in “ON-OFF” switch. The
Model 55S shall have no “ON-OFF” switch. The mi-
crophone rating Gm (Sensitivity) at 1,000 Hz. shall be
within ± 3 db of the following levels:
Impedance Selection
Selection of the various impedances is accomplished
by changing the position of the switch at the rear of
the microphone. The switch positions are marked “L”
for low impedance (25-50 ohms), “M” for medium
impedance (150-250 ohms), and “H” for high imped-
ance (35,000 ohms).
When using the microphone in low impedance, the
black and white conductors are the “hot” conductors
for balanced line connections to a standard low or
medium impedance input amplifier; the shield lead is
connected to the chassis or amplifier ground.
When using the microphone in high impedance, the
white conductor is the “hot” conductor for connection
to a high impedance amplifier; the black conductor
and the shield are connected to the chassis or am-
plifier ground.
“L” Position of switch ............................ - 148.0 db
“M” Position of switch............................ - 148.5 db
“H” Position of switch............................ - 151.5 db
EIA Standard SE-105 August 1949
The microphone shall be provided with a swivel and
it shall have a detachable cable connector capable of
connection to a two-conductor shielded cable. The
microphone will mount on stand having 5/8”-27 thread.
3
The overall dimensions shall be 7 /8 (187.3 mm) ± ¼
1
inches in height, 2-3/16 (55.6 mm) ±
/
inches in
8
width, and 3-1/16 (77.8 mm) ± 1/8 inches in depth.
Copyright 1967, Shure Brothers Inc.
27A174 (KI)
Printed in U.S.A.
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