User Manual

SHURE Incorporated Web Address: http://www.shure.com
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
In U.S.A., Phone: [phone] Fax: [phone]
In Europe, Phone: [phone] Fax: [phone]
In Asia, Phone: [phone] Fax: [phone]
International Fax: [phone]
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 [phone] or
[phone] (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
135
o
; spacing: coincident
ORTF (French
Broadcasting Corporation)
2 Cardioid Axes of maximum response at
110
o
; spacing: 17 cm. (7 in.)
NOS (Dutch Broadcasting
Foundation)
2 Cardioid Axes of maximum response at
90
o
;spacing: 30 cm. (12 in.)
Blumlein Pair or
stereosonic
2 Bidirectional Axes of maximum response at
90
o
; spacing: coincident
MS (Mid-Side) 1 Cardioid
1 Bidirectional
Cardioid and bidirectional
forward pointed;
spacing: coincident