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Load Impedance
Maximum SPL capability, output clipping level, and dy-
namic range vary with the input load impedance of the
preamplifier to which you connect the microphone. Shure
recommends a minimum input load impedance of 1000
Ω. Most modern microphone preamplifiers meet this
requirement. Higher impedance results in better perfor-
mance for these specifications.
Power Requirements
This microphone requires phantom power and performs
best with a 48 Vdc supply (IEC-61938). However, it will
operate with slightly decreased headroom and sensitivity
with supplies as low as 11 Vdc.
Most modern mixers provide phantom power. You must
use a balanced microphone cable: XLR-to-XLR or
XLR-to-TRS.
Avoiding Pickup of Unwanted Sound Sources
Directional microphones are most sensitive to sounds arriving on axis and reject at angles depending upon the polar pattern. The following chart shows the rejection angles of each
microphone. In live performance or recording settings, align monitors, P.A. loudspeakers, and unwanted sound sources at these angles.
To minimize feedback and ensure optimum rejection of unwanted sound, always test microphone placement before a performance.
Cardioid
Off-axis null points at 180 degrees
20,32 mm
4
Accessories and Parts
Furnished Accessories
Mic Clip
Zippered Carrying Case
Windscreen
Optional Accessories
Cardioid Capsule
Supercardioid Capsule
Bidirectional Capsule
Omnidirectional Capsule
Beta 181 Preamp
Universal Microphone Mount
Shock Stopper™ Isolation Mount
7.6 m (25 ft.) Cable
(0.80 in.)
A181WS
RPM181/C
RPM181/S
RPM181/BI
RPM181/O
RPM181/PRE
Supercardioid
Off-axis null points at 120 degrees
124,46 mm
(4.90 in.)
CERTIFICATION
Eligible to bear CE Marking. Conforms to European EMC
Directive 2004/108/EC. Meets Harmonized Standards
EN55103-1:1996 and EN55103-2:1996, for residential
A57F
(E1) and light industrial (E2) environments.
A181C
The Declaration of Conformity can be obtained from:
Authorized European representative:
Shure Europe GmbH
Headquarters Europe, Middle East & Africa
Department: EMEA Approval
Wannenacker Str. 28
D-74078 Heilbronn, Germany
Phone: +49 7131 72 14 0
Fax: +49 7131 72 14 14
Email: EMEAsupport@shure.de
A75M
Note:
Information in this guide is subject to change
A53M
without notice. For the additional information about this
C25E
product, please visit www.shure.com.
Bidirectional
Off-axis null points at 90 degress
34,54 mm
(1.36 in.)
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