The ES947 is a wide-range
Fixed-charge back plate
condenser microphone with a
permanently polarized condenser
unidirectional polar pattern. It is
Unidirectional (Cardioid in
designed for unobtrusive table,
hemisphere above mounting surface)
ceiling or panel-mounted appli-
cations for high-quality sound
OPEN CIRCUIT SENSITIVITY
–42 dB (7.9 mV) re 1V at 1 Pa*
professional recording, television
and other demanding sound
MAXIMUM INPUT SOUND LEVEL
142 dB SPL, 1 kHz at 1% T.H.D.
DYNAMIC RANGE (typical)
113 dB, 1 kHz at Max SPL
The ES947 is equipped with
65 dB, 1 kHz at 1 Pa*
nology, which offers outstanding
PHANTOM POWER REQUIREMENTS 11-52V DC, 2 mA typical
rejection of radio frequency
64 g (2.3 oz)
30.0 mm (1.18") diameter,
The microphone should be
69.0 mm (2.72") length
placed on a flat, unobstructed
Integral 3-pin XLRM-type
mounting surface. The small-
diameter capsule near the
One pair isolators
boundar y eliminates phase
†In the interest of standards development, A.T.U.S. offers full details on its test
distortion and delivers clear, high-output performance.
methods to other industry professionals on request.
*1 Pascal = 10 dynes/cm
= 10 microbars = 94 dB SPL
The microphone requires 11V to 52V phantom power for operation.
Typical, A-weighted, using Audio Precision System One.
Specifications are subject to change without notice.
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 ES947W. 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
Frequency in Hertz
positive voltage at Pin 2 in accordance with industry convention.
12" or more on axis
SCALE IS 5 DECIBELS PER DIVISION
To mount the ES947 in a ceiling or table top without the isolators,
" (20.5 mm) diameter hole is required. To mount the ES947
with the isolators, a
" (23.5 mm) hole is required. Place the
isolators on either side of the hole to achieve mechanical isolation
from the mounting surface. The small indented circle on the ES947
FRONT OF MIC
bezel indicates the "front" of the microphone.
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
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 12,000 Hz and a
unidirectional (cardioid in a hemisphere above the mounting surface
boundary) polar pattern. It shall incorporate a self-contained power
module and require 11-52V DC phantom power to operate.
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 113 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
The microphone shall have a maximum diameter of 30.0 mm
(1.18") and an overall length of 69.0 mm (2.72"). Weight shall be
64 grams (2.3 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]. A small indented circle on the bezel shall
indicate the "front" of the microphone. Resilient isolators shall be
provided for reduction of mechanical noise transfer from the
mounting panel. The Audio-Technica ES947 [ES947W] is specified.
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
©2007 Audio-Technica U.S., Inc.
Printed in Japan