Shure 525 User Guide

222

HARTREY AVE . EVANSTON,

MICROPHONES AND ELECTRONIC COMPONENTS

EVANSTDN PHONE DA 89000 . CHICAGO PHONE SH 3.1600

ILL

.

CABLE

OMNI-DIRECTIONAL DYNAMIC

Specifications

Response Frequency Characteristic:

c.p.s. uniformity insured to plus or minus 2%

15,000

It

is

especially designed to meet the exacting require-

N,

ments of

tions.

radio broadcasting and all studio applica-

From 40 to

SHUREMICRO

DATA

Multi-Impedance

db.

MODEL

"525"

STUDIO MICROPHONE

Polar Pattern:

1000

C.P.S. Response

Model 525

Open Circuit Voltage Level.

Power Level into 50 ohm..
RETMA Microphone Rating

GM

(Sensitivity)

Model 525

Open Circuit Voltage Level.

Power Level into 150 ohms.
RETMA Microphone Rating

GM

(Sensitivity)

Model 525

Open Circuit Voltage Level.

Power Level into 250 ohms.
RETMA Microphone Rating

GM

(Sensitivity)

0

(*)

(**)

(***)

db

0

db

RETMA Standard SE-105, August 1949.

Rated Impedances:

multi-impedance switch furnishing a choice of three im­pedances-"L" (50 ohms);
ohms).

Omni-directional.

"L"

Position

.........

................

"M"

Position

.........

................

"H"

Position

.........

.................

=

I

Volt Per Microbar.

=

I

Milliwatt with 10 Microbar.

Model 525 is equipped with a

"Mu

........

.-

.-

.-I

........

.-

.-

.-

.........

.- 61

-1

(150 ohms);

-

88

61

53

83

6

I54

8

52

"H"

1

1

db*

db**

db***

db*

db**

db***

db*

db**

db***

(250

Cable:

cable with Cannon

Swivel Adapter:

Model A25 swivel adapter which is furnished with the
microphone.
lifetime swivel which permits the microphone to be tilted
thru

Dimensions:

Finish:

Copyright

27A82

20 foot (6.1 m) Broadcast 2-conductor shielded

XL-3-1 I connector attached.

Model 525 may be used with the

It

has a self-adjusting "positive action"

90° from vertical to horizontal.

See Fig.

Non-reflecting "Baked Bronze" and Beige case.

1954.

Shure Brothers.

(6-62)

C.

Inc.

Shure Patents

Printed

Pmdinr.

in

U.S.h

Stand Thread:

5/8"-27 thread. Adapters for

thread are available UPon

Weight:

3%

Ib.

(14749)

The Model A25 swivel adapter has a

N-t

weight

1/2

Ib. (226.8g), Packaged weight

y2"

pipe thread or 58"-24

request

at

extra

I

arge.

stand. Stand coupler

for

1/211

pipe

Brothers, Inc.) To avoid
lines are used, care should be taken that the cable does
not parallel

A.C.

adapters are available at no charge

thread

or 5/8"-24 thread. (Write Shure

A.C.

hum induction when long

power lines for long distances.

Code Word:

General:

slender moving-coil dynamic microphone, custom-built to

provide high fidelity re
and features an omni­phone has complete
and outdoor use and may
manner.

Mounted in swivel adapter on a conventional floor

I.

or desk stand.

Quick disengage feature permits the microphone

2.
to be removed from the swivel adapter for use
as a hand, audience participation, interviewer
microphone, etc.

Equipped with adjustable lavalier cord and belt

3.

clip, the microphone may be used as a wearable
unit

Readily accessible impedance switch permits quick

4.

change.

The extended, smooth, frequency res onse and the at­tending faithful reproduction are large y due to a newly
designed diaphragm attached to a sensitive coil suspend­ed in a magnetic structure. The use of high efficiency
magnetic materials and specially designed magnetic
circuits has made
phone and

The microphone is ruggedly built to withstand hard
usage and
variations. The 20-foot (6.1 m) broadcast quality, shielded:
two-conductor cable
phone plug

The "525" meets the most exacting requirements for
maximum quality and minimum size. The Model A25 ad­justable swivel
and permits the microphone to be tilted through
from vertical to horizontal, making
microphone at the source of sound.

An adjustable lavalier cord and a belt clip
are supplied which facilitate the use of the microphone

by

public speakers and lecturers; teachers and instructors;
demonstrators; and all similar applications where freedom
of both hands
on the microphone, can be readily fastened around the
wearer's neck, and quickly removed.

RUDED.

The Model "525" Studio Microphone is

roduction of voice and music

d'

irectional pattern. The micro-

versat~l~ and reliability for indoor

e used in the following

"*s

by

lecturers, broadcast announcers, etc.

f

it

possible to develop this small micro-

still

achieve maximum operating efficiency.

is

unaffected

adapter is supplied with the microphone

is

necessary. The lavalier cord clips easily

by

temperature and humidit

is

supplied with a Cannon micro-

it

simple to aim the

a~sembly

a

90'

TWO

CONDUCTOR

SHIELDED

CABLE

SINGLE CONDUCTOR SHIELDED
CA8LE.CABLE LENGTH NOT IN
EXCESS OF

MATCHES EITHER 50 OHMS
250 OHMS TO HlGH IMPEDANCE

7.'

OR

FIG.

A

AMPLIFIER

WITH

HIGH

Applications:

meets all requirements of broadcast, television, record­ing and all types of studio work because the frequency
response is controlled within close tolerances.
ideal for highest-quality public address, both indoors and
outdoors. The microphone may be used for either a
single performer, a dialogue, a group, an orchestra
practically all individual and group applications.

Installation:

swivel adapter, has a standard
mounted on any conventional desk, banquet or floor

The Model "525" Studio Microphone

It

is,

also,

-

The Model "525", when used with the

5/8"-27 thread and may be

FIG.

B

Connections:

impedance microphone.
to a 50 ohm line, a
lection of these impedances is accomplished by removing
the impedance-switch cover-plate on the micro hone and
changing the position of the switch. The switc positions
are marked
for medium impedance (150 ohms) and
ohms.

The microphone plug
cable shield is connected to the No.
ductor is connected to the No. 2 pin; and the white con­ductor

ed to the microphone case. Pins No. 2 and No. 3 are
connected to the internal elements and the microphone
may be used with a balanced line. The Model "525" may

be connected directly to a standard low or medium im­pedance input amplifier

achieve maximum freedom from hum disturbances and
internal cable noises) use broadcast quality two conduc-

tor shielded cable (such as supplied with the microphone).

In this case, the shield of the cable must be connected

to Pin No.

conductors should be connected to Pins No. 2 and No.

3. The permissible cable length is

since neither response nor level is appreciably affected.

A86A Cable-Type Transformer is available for coupling
the low impedance line to the amplifier input as shown

in Fig. A-2. The double winding primary of the Shure
Model
a 50 ohm line or a 250 ohm line to the high impedance
input.

ly connected to a water pipe or similar ground to prevent
shock hazard during operation of amplifying system.

is

connected to the No. 3 pin (See Fig.

The No. I pin of the microphone receptacle is connect-

If

additional lengths of cable are required (and to

For use with high impedance amplifiers, Shure Model

A86A Cable-Type Transformer permits coupling

The shield, chassis or amplifier ground should be secure-

When used with amplifiers using the grid leak type of
bias at the input tube,
mfd. condenser between the microphone and the input
grid circuit.

Operation:

is

care
Microphone.
under all ordinary conditions in hot and cold climates. To
retain the full strength of the highly efficient permanent
magnet and to maintain alignment of the structure,
dropping or other severe mechanical shocks should be
avoided.

stands, and the Shure S33 Desk Stand. The microphone
may be easily and instantly removed from this adapter
for use as a hand microphone
phone out of the adapter. Additional versatility in the

use of the microphone is obtained

cord in applications where freedom of both hands

necessary. Fig. B illustrates use of these accessories.

necessary in the operation of the Model "525"

The swivel adapter fits conventional floor stands, desk

The Model "525" Microphone

It

may be connected directly

150 ohm line, or a 250 ohm line. Se-

is

a multi-

e

"L"

for low impedance (50 ohms) and

"H"

for 250

is

the Cannon XL-3-1

I

pin; the E lack con-

[Fig.

A-I).

I

of the microphone plug. The two "hot"

practically unlimited,

it

may be desirable to use .01

No special precaution beyond ordinary

It

will operate efficiently and dependably

simply by pulling the micro-

by

using the lavalier

lug. The

I

D).

"Mu

Guarantee:

from electrical and mechanical defects for a period of
one year from date of shipment from factory, provided

all instructions are complied with fully. In case of dam­age, return the microphone to the factory for repairs.
Our guarantee

to accident or abuse or

Each microphone

is

voided

if

is

guaranteed to be free

if

the microphone is subjected

the case

is

opened.

IH

'i

(28.6

mm)

is

f-,

INTERNAL

(23.8

MICROPHONE CABLE­RECEPTACLE ASSEMBLY

-

mm)

FIG.

C

CONNECTIONS

CASE

1

FIG.

D

I

PLUG