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
reproduction over individually miked instruments. The
spaced microphone technique creates a stereo effect mainly
because 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
interchannel 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
systems. It specifies microphone types, angles and spacing.
Those with coincident spacing have their diaphragms
vertically in line. Closely spaced microphones have their
diaphragms 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
Techniques for Music Studio Recording” (AL1265) available
from Shure Incorporated.
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
Guarantee
This Shure product is guaranteed in normal use to be
free from 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 guarantee 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, have it insured, and return it
prepaid to: Shure Incorporated. Attention: Service
Department, 222 Hartrey Avenue, Evanston, Illinois
60202–3696. 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.
SHURE Incorporated Web Address: http://www.shure.com
222 Hartrey Avenue, Evanston, IL 60202–3696, U.S.A.
Phone: 847-866–2200 Fax: 847-866-2279
In Europe, Phone: 49-7131-72140 Fax: 49-7131-721414
In Asia, Phone: 852-2893-4290 Fax: 852-2893-4055
Elsewhere, Phone: 847-866–2200 Fax: 847-866-2585
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