Shure A27M Handleiding

Shure Niet gecategoriseerd A27M

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Model A27M User Guide

27B1424 (Rev. 3)

Printed in U.S.A.

STEREO MICROPHONE ADAPTER

The Shure model A27M is a stereo microphone adapter

designed to hold two microphones in selectable positions for

stereo broadcasting, recording or sound reinforcement. It

allows two microphones to share one stand without losing

independent positioning flexibility. The A27M permits coin-

cident or closely spaced mounting with a wide range of di-

rectional angles, and vertical microphone separations of 1

1/4 inches (31.8 mm), 2 5/8 inches (66.7 mm) or 4 inches

(102 mm).

The A27M consists of two vertically stacked sections that

rotate on their centers. Each contains a 5/8"-27 threaded

stud and locking ring to accept a variety of microphones.

The bottom section contains a 5/8"-27 adapter for mounting

on a microphone stand. A cable clamp for holding micro-

phone cables is included.

Installation

To install the A27M, follow these steps:

1. Determine the vertical separation between microphones

you desire. Minimum separation (coincident spacing) is

generally desirable, but it may be necessary to provide

greater spacing to accommodate the size or style of the

microphones. By repositioning the sections of the

A27M, the threaded studs may be 1 1/4 inches (31.8

mm), 2 5/8 inches (66.7 mm) or 4 inches (102 mm)

apart.

2. To reposition the sections, unscrew the knurled knob at

the top of the A27M and slide the two black sections off

the vertical rod. Reposition the sections with the studs

positioned for the vertical spacing desired. Replace the

knurled knob.

3. Attach the microphones or swivel adapters (such as the

Shure A57D or A57E) to the 5/8"-27 studs.

4. Attach the A27M to a microphone stand with a 5/8"-27

mounting thread.

5. Insert the microphones in the swivel adapters, loosen

the knurled knob on the top of the A27M, and position

the microphones for the desired response angles. The

top of the knurled knob contains reference marks every

45o; these may be used to position the microphones at

the desired angle (see Figure 1).

FIGURE 1

6. Tighten the knurled knob, attach the microphone cables,

and use the supplied cable clamp to fasten the micro-

phone cables to the A27M.

7. Raise the microphone stand to the desired height. Fig-

ure 2 shows a pair of Shure SM81 microphones

mounted in an “ORTF” configuration on the A27M.

FIGURE 2

SHURE Incorporated Web Address: http://www.shure.com

5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.

In U.S.A., Phone: 1-847-600-2000 Fax: 1-847-600-1212

In Europe, Phone: 49-7131-72140 Fax: 49-7131-721414

In Asia, Phone: 1-852-2893-4290 Fax: 1-852-2893-4055

International Fax: 1-847-600-6446

Stereo Recording Options

The A27M supports various popular pickup systems.

Those described below result in (1) improved imaging over

widely spaced microphones, and (2) superior depth repro-

duction over individually miked instruments. The spaced

microphone technique creates a stereo effect mainly be-

cause of differences in the arrival time of the sound at each

microphone. Coincident systems produce minimal arrival

time differences. The stereo effect they create is due to in-

terchannel amplitude differences. Closely spaced or

near-coincident placement lends both time and amplitude

differences to the stereo effect.

The table below describes five popular stereo pickup sys-

tems. It specifies microphone types, angles and spacing.

Those with coincident spacing have their diaphragms verti-

cally in line. Closely spaced microphones have their dia-

phragms separated by the specified distance. These and

other microphone systems are detailed in the book “Stereo

Microphone Techniques” by Bruce Bartlett (1991, Focal

Press. ISBN 0-240-80076-1) and in “Microphone Tech-

niques for Music Studio Recording” (AL1265) available from

Shure Incorporated.

Full Two Year Warranty

Shure warrants this product to be free in normal use of

any defects in workmanship and materials for two (2) years

from the date of purchase. If your Shure product fails within

this period, call 1-800-516-2525 in the United States for de-

tails on repair, replacement, or refund. In Europe, contact

Shure Incorporated Europe GMBH at +49 (7131) 7214-0 or

+49 (7131) 7214-30 (service hotline) or contact your autho-

rized Shure distributor. This warranty does not cover abuse

or misuse of the product, use contrary to Shure’s instruction,

ordinary wear and tear, an act of God or unauthorized repair.

Stereo Pickup systems Microphone Types Microphone Configurations

X-Y 2 Cardioid Axes of maximum response at

135o; spacing: coincident

ORTF (French

Broadcasting Corporation)

2 Cardioid Axes of maximum response at

110o; spacing: 17 cm. (7 in.)

NOS (Dutch Broadcasting

Foundation)

2 Cardioid Axes of maximum response at

90o;spacing: 30 cm. (12 in.)

Blumlein Pair or

stereosonic

2 Bidirectional Axes of maximum response at

90o; spacing: coincident

MS (Mid-Side) 1 Cardioid

1 Bidirectional

Cardioid and bidirectional

forward pointed;

spacing: coincident

Product specificaties

Merk:	Shure
Categorie:	Niet gecategoriseerd
Model:	A27M
Kleur van het product:	Black, Gold
Aantal:	1
Type product:	Microfoonadapter

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