DESCRIPTION
The ES947 is a wide-range
condenser microphone with a
unidirectional polar pattern. It is
designed for unobtrusive table,
ceiling or panel-mounted appli-
cations for high-quality sound
reinforcement, teleconferencing,
professional recording, television
and other demanding sound
pickup applications.
The ES947 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
boundar y 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 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
positive voltage at Pin 2 in accordance with industry convention.
To mount the ES947 in a ceiling or table top
without
the isolators,
a
13
⁄
16
" (20.5 mm) diameter hole is required
. To mount the ES947
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. The small indented circle on the ES947
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
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 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
connector.
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.
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
P51944 ©2007 Audio-Technica U.S., Inc. Printed in Japan
ES947
ES947 SPECIFICATIONS
†
ELEMENT
Fixed-charge back plate
permanently polarized condenser
POLAR PATTERN
Unidirectional (Cardioid in
hemisphere above mounting surface)
FREQUENCY RESPONSE
40-12,000 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)
113 dB, 1 kHz at Max SPL
SIGNAL-TO-NOISE RATIO
1
65 dB, 1 kHz at 1 Pa*
PHANTOM POWER REQUIREMENTS
11-52V DC, 2 mA typical
WEIGHT
64 g (2.3 oz)
DIMENSIONS
30.0 mm (1.18") 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.
CARDIOID CONDENSER
BOUNDARY MICROPHONE
1.18"
30.0 mm
DESIGNATES
FRONT OF MIC
1.02"
26.0 mm
0.33"
8.5 mm
2.72"
69.0 mm
NUT
0.79"
20.0 mm
ISOLATORS
TABLE
