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DESCRIPTION
The ES945 is a wide-range
condenser microphone with an
omnidirectional polar pattern.
It is designed for unobtrusive
table, ceiling or panel-mounted
applications for high-quality
sound reinforcement, teleconfer-
encing, professional recording,
television and other demanding
sound pickup applications.
The ES945 is equipped with
UniGuard
™
RFI-shielding tech-
nology, which offers outstanding
rejection of radio frequency
interference (RFI).
The microphone should be
placed on a flat, unobstructed
mounting surface. The small-
diameter capsule near the
boundary eliminates phase
distortion and delivers clear, high-output performance.
The microphone requires 11V to 52V phantom power for operation.
The microphone is enclosed in a heavy-duty die-cast case and
protected by a two-layer steel mesh grille. The low-profile housing
has a low-reflectance black finish. The microphone is also available
in white as the ES945W (shown above). Isolators are included with
the microphone for optional mechanical isolation from the mounting
surface.
INSTALLATION AND OPERATION
Output is low impedance balanced. The balanced signal appears
across Pins 2 and 3, while the ground (shield) connection is Pin 1.
Output is phased so that positive acoustic pressure produces
positive voltage at Pin 2 in accordance with industry convention.
To mount the ES945 in a ceiling or table top
without the isolators,
a
13
⁄
16
" (20.5 mm) diameter hole is required. To mount the ES945
with the isolators, a
15
⁄
16
" (23.5 mm) hole is required. Place the
isolators on either side of the hole to achieve mechanical isolation
from the mounting surface.
While a modern fixed-charge condenser microphone is not unduly
sensitive to the environment, temperature extremes can be harmful.
Exposure to high temperature can result in gradual and permanent
reduction of the output level. Avoid leaving the microphone in the
open sun or in areas where temperatures exceed 110° F (43° C)
for long periods of time. Extremely high humidity should also be
avoided.
ARCHITECTS AND ENGINEERS SPECIFICATIONS
The microphone shall be a fixed-charge condenser designed
for use in table, ceiling or panel-mount boundary applications. It
shall have a frequency response of 40 Hz to 18,000 Hz and an
omnidirectional polar pattern. It shall have a self-contained power
module and shall operate from an external 11V to 52V DC phantom
power source. It shall offer outstanding rejection of radio frequency
interference (RFI). It shall be capable of handling sound input
levels up to 142 dB with a dynamic range of 112 dB. Nominal open
circuit output voltage shall be 7.9 mV at 1 kHz, 1 Pascal. Output
shall be low impedance balanced (200 ohms) from an integral 3-pin
XLRM-type connector.
The microphone shall have a maximum diameter of 28.0 mm
(1.10") and an overall length of 69.0 mm (2.72"). Weight shall be
63 grams (2.2 oz). The microphone shall be housed in an all-metal
case with a two-layer steel mesh grille. Finish shall be low
reflectance black [white]. Resilient isolators shall be provided for
reduction of mechanical noise transfer from the mounting panel.
The Audio-Technica ES945 [ES945W] is specified.
8 kHz
Polar Pattern
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
200 Hz
1 kHz
5 kHz
Frequency in Hertz
LEGEND
12" or more on axis
Frequency Response
Response in dB
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
www.audio-technica.com
P51943 ©2007 Audio-Technica U.S., Inc. Printed in Japan
ES945
ES945 SPECIFICATIONS
†
ELEMENT Fixed-charge back plate
permanently polarized condenser
POLAR PATTERN Omnidirectional
FREQUENCY RESPONSE 40-18,000 Hz
OPEN CIRCUIT SENSITIVITY –42 dB (7.9 mV) re 1V at 1 Pa*
IMPEDANCE 200 ohms
MAXIMUM INPUT SOUND LEVEL 142 dB SPL, 1 kHz at 1% T.H.D.
DYNAMIC RANGE (typical) 112 dB, 1 kHz at Max SPL
SIGNAL-TO-NOISE RATIO
1
64 dB, 1 kHz at 1 Pa*
PHANTOM POWER REQUIREMENTS 11-52V DC, 2 mA typical
WEIGHT 63 g (2.2 oz)
DIMENSIONS 28.0 mm (1.10") diameter,
69.0 mm (2.72") length
OUTPUT CONNECTOR Integral 3-pin XLRM-type
ACCESSORY FURNISHED One pair isolators
†In the interest of standards development, A.T.U.S. offers full details on its test
methods to other industry professionals on request.
*1 Pascal = 10 dynes/cm
2
= 10 microbars = 94 dB SPL
1
Typical, A-weighted, using Audio Precision System One.
Specifications are subject to change without notice.
OMNIDIRECTIONAL CONDENSER
BOUNDARY MICROPHONE
0.79"
20.0 mm
ISOLATORS
CEILING
1.10"
28.0 mm
0.33"
8.5 mm
2.72"
69.0 mm
NUT