Shure 545 UNIDYNE III User manual

UNIDIRECTIONAL DYNAMIC MICROPHONES
222 HARTREY AVE.. EVANSTON. IL. 60204 U.S.A.
@
AREA CODE 31~/866-zzoo .CABLE: SHUREMICRO
TWX: 910-231-0048 TELEX: 72-4381
GENERAL
DATA MODELS 545 AND 545s
SHEET
UNIDYNEB Ill
The Model 545 Series UNIDYNEO Ill Microphones are
slender dynamic microphones built to provide wide range
reproduction of music and voice, and have an exceptionally
uniform and effective unidirectional pickup pattern.
i
The microphones are particularly suitbLie for high quality
theater-stage sound systems, recording, cathedrals and
churches, and other critical public address systems such as
those used in political conventions and legislatures, hotels,
stadiums, and public: auditoriums.
Microphone Features:
Unusually effective cardioid pickup pattern that elim-
inates feedback (annoying loudspeaker "squeals") and
prevents echoing (boominess) that sometimes occurs
in partially-filled halls. Can also be used closer to loud-
speakers than usual, without creating feedback problems
Response especially effective for announcing, narration,
vocal and instrumental music
Cartridge shock mounted for quiet operation
A strong detachable cable especially selected for good
shielding from "hum" pickup
Dependability and ruggedness under all operating con-
ditions
The Model 545 Series Microphones are dual impedance
for connection to microphone inputs rated at 19 to 300 ohms
or to high-impedance microphone inputs.
ARCHITECTS' SPECIFICATIONS
The microphone shall be the Shure Model 545 (5453) or
equivalent. The microphone shall be a dynamic (moving coil)
type microphone with a frequency response of 50 to 15,000
Hz. The unit shall have a cardioid polar characteristic. The
cancellation at the sides shall be approximately 6 dB, and
the cancellation at the rear shall be 15 to 20 dB. The micro-
phone shall be a dual-impedance microphone with a rated
impedance of 150 ohms for connection to microphone inputs
rated at 19 to 300 ohms and "High" for connection to high-
impedance microphone inputs. The microphone output
shall be:
Low Impedance
........................................ - 57 dB
(0 dB = 1 milliwatt per 10 microbars)
High Impedance
......................... .......- 55 dB
(0 dB = 1 volt per microbar)
The microphone (Model 545) shall be provided with a
swivel adapter, adjustable through 90" from vertical to
horizontal, and suitable for mounting on a stand having a
%"-27 thread. It shall be provided with a detachable 4.6m
(15 ft) three-conductor shielded cable with a four-pin male
audio connector (equivalent to the Amphenol MC4M con-
nector) at the microphone end. The overall dimensions of
the microphone shall be 148 mm (5-13116 in.) in length and
31.8 mm (1%
in.) in diameter.
The microphone (Model 5453) shall be provided with a
swivel, and a built-in On-Off switch. It shall also be provided
with a detachable 4.6m (15 ft) three-conductor shielded cable
with a four-pin male audio connector (equivalent to the
Amphenol MC4M connector) at the microphone end. The
overall dimensions of the microphone shall be 122.2 mm
(4-13116 in.) in height, 31.8 mm (1% in.) in width and 148 mm
(5-13116 in.) in depth.
IMPEDANCE SELECTION
Either high- or low-impedance operation of these micro-
phones is selected by the leads chosen for connection at
the equipment end of the microphone cable. For high
impedance, the RED lead is the "hot" conductor; the shield
is connected to the amplifier or chassis ground. For
balanced-line low im~edance,the BLACK and WHITE leads
are the "hot" conductors; the shield is connected to the
amplifier or chassis ground. For unbalanced low impedance,
the WHITE lead is the "hot" conductor with the BLACK lead
and shield connected together to the amplifier or chassis
ground. Any leads not being used for a particular connection
should be insulated at the equipment end of the cable.
The low-impedance connection is 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-impedance amplifiers,
the Shure Model A95 Series Line Matching Transformers are
available for coupling a low-impedance line to the amplifier
input. The Model A95 Series transformers permit coupling a
19-300 ohm microphone line to a high-impedance input.
Copyright 1978. Shure Brothers Inc.
27A443 (RC)
(OVER)
Important:
Shure Microphone Cables are selected after ex-
haustive tests to insure superior performance in microphones
because of low capacities, superior shielding properties and
unusually long life under severe use.
Cables with plastic insulation should not be subjected to
excessive soldering-iron heat. Carefully clean and tin the
conductors and the connections to which the conductors
are to be soldered. The soldering operation can then be
done with a minimum of heat, thereby avoiding any pos-
sibility of damage to the cable.
U.S. Patents 3,132,713, 3,240,883 and D190,864
Printed in U.S.A.

SPECIFICATIONS Output Level (at 1000
Hz)
Low lmpedance
....................
Open Circuit Voltage
- 78 dB* (.I25 mV)
....................................
Power Level -57 dB**
Type
Dynamic
Frequency Response
50 to 15,000 Hz (see Figure 1)
FREQUENCY
RESPONSE
FIGURE 1
Polar Pattern
Cardioid (unidirectional) pattern-Effective rejection of
sound at the rear of the microphone is uniform at all
frequencies, while front pickup characteristics are uniform
about the axis (see Figure
2)
I TYPICAL DIRECTIONAL PATTERN I
FIGURE 2
Impedance
DUAL. Low: Microphone rating impedance is 150 ohms
(270 ohms actual) for connection to microphone inputs
rated at 19 to 300 ohms.
High: Microphone impedance is "High" for connection to
high-impedance microphone inputs. Selection of impedance
made by choice of cable leads connected at equipment
end of cable (see section on lmpedance Selection).
POSITIVE PRESSIRE PRDWCES POSITIVE VOLTAGE ON PIN I OR PIN 3
AWMNOL MCOF
TYPE PLUG7
- - CABLE-PLUG
CARTR~E GROW CASEOROUND ASSEMBLY
MODEL 545
TRANSFWYER?., RED AUMNOL MCOF
! 111:
TYPE cwmcTm
CABLE- PLUG
CARTRIDGE
GROUND CASE
GROUND
MODEL 545s
INTERNAL CONNECTIONS
FIGURE
3
WELL
High lmpedance
....................
Open Circuit Voltage -55 dB* (1.76 mV)
'0 dB = 1 volt per microbar
**0 dB = 1 milliwatt per 10 microbars
Switch
Model 545
- None
Model 5458
- Built in On-Off switch to control micro-
phone circuit. The switch is an integral part of the con-
nector assembly and is a slide-to-talk locking type switch
Cable
4.6 meter (15 ft) three-conductor shielded with Amphenol
MC4M connector on the microphone end
Case
Chrome-plated die casting with black ARMO-DUR8qgrille
and stainless steel screen
Dimensions
See Figure 4
Net Weight
Model 545
- 255 grams (9 02.)
Model 5458 - 425 grams (15 02.)
L
31.8 mm
11-114 IN)
MODEL 545
Z3.8 mm llS/lB IN.!
MODEL 5455
OVERALL DIMENSIONS
FIGURE 4
FURNISHED ACCESSORY 545 545s
Swivel Adapter ................................ A25B
OPTIONAL ACCESSORIES
Line Matching Transformer
.......... A95 Series A95 Series
Vibration-Isolation Stand
.............. S39A S39A
Desk Stand ...................................... S33S40A S37A, S40A
Quick Disconnect Adapter ............ A45 A47
.....................................
Windscreen A2WS A2WS
Carrying Case ............................... AC54 AC54S
REPLACEMENT PARTS
Dvnamic Cartridae
.......................... R45 R45
cable and Plug assembly .............. C56 C56
..............................................
Sw~tch RK32S
................................
Case Assembly RK42C RK41C
...................... Connector Assembly RK33CA
............................
Cable Connector RK117P RK117P
...... .................... Plug Element ... RK31P RK31 P
GUARANTEE
This Shure product is guaranteed in normal use to be free
from electrical and mechanical defects for a period of one
year from date of purchase. Please retain proof of purchase
date. This guarantee includes all parts and labor. This guar-
antee is in lieu of any and all other guarantees or warranties,
express or implied, and there shall be no recovery for any
consequential or incidental damages.
SHIPPING INSTRUCTIONS
Carefully repack the unit and return it prepaid to:
Shure Brothers Incorporated
Attention: Service Department
1501 West Shure Drive
Arlington Heights, Illinois 60004
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.