![](/html/d0/d05e/d05e94bb270f416818b2e64618e00baf5b90b463941f1522b358511315a93d03/bg1.png)
ATND933aC & ATND933aWC Cardioid Condenser Hanging
Microphones with Dante™ Network Output
enclosed in a rugged housing with a low-reflectance black finish. It is also available
with white housing, cable, hanger and windscreen as the ATND933aWC.
Installation and Operation
A uniform 120° angle of acceptance provides well-balanced audio pickup. The
microphone should be located forward of the front-most source, above the rear-most
source, and “aimed” between them (Fig.1). Increasing the height of the mic above
the sources will tend to equalize sound levels between them, but may also increase
background/ reverberant sound pickup. When possible, the distance from the mic to
the rear-most source should be no more than twice the distance to the front source,
to maintain front-to-rear balance (Fig. 1).
Width of pickup is approximately three times the distance to the closest source. If
additional mics are needed for wide sources, they should be positioned apart laterally at
least three times the distance to the front source, to avoid phase cancellation (Fig. 2).
Network Microphones
Features
• Wall/ceiling plate power module with Dante™ network output permits
permanent installation in standard, 2-gang electrical box and direct
connection to the network via Ethernet cable
• Uniform cardioid polar pattern with 120° acceptance angle
• Low-profile design with low-reflectance finish for minimum visibility
• Superior o-axis rejection for maximum gain before feedback
• Logic input accepts external switch for connection to the Dante™ network
• UniGuard® RFI-shielding technology oers outstanding rejection of radio
frequency interference (RFI)
• UniSteep® filter provides a steep low-frequency attenuation to minimize
pickup of undesired ambient noise
• Available interchangeable elements permit angle of acceptance
from 90° to 360°
• Steel hanger positions microphone over choirs, instrumental groups
and theater stages
• Available in two colors: black (ATND933aC) and white (ATND933aWC)
Description
The ATND933aC is a wide-range miniature condenser microphone with a cardioid
polar pattern. It is designed for quality sound reinforcement, professional recording,
television and other demanding sound pickup applications. The combination of small
size and excellent response makes the microphone ideal for suspension over choirs,
instrumental groups or theater stages.
The microphone is equipped with UniGuard® RFI-shielding technology, which oers
outstanding rejection of radio frequency interference (RFI).
The microphone’s cardioid polar pattern provides a 120° angle of acceptance.
Additional interchangeable elements with omnidirectional (360°), hypercardioid
(100°) and MicroLine® (90°) pickup patterns are available.
The microphone includes a 15.2 m (50') permanently attached miniature cable. Its free
end connects to the provided ATND8734a Dante-enabled wall/ceiling plate power
module via a special TA3F-type connector designed to optimize RFI immunity. The
power module features a removable, circular cover plate that can be painted with
commercially available spray paint. The power module includes an RJ-45 output jack
for easy connection to the network via CAT5e (or better) cable. Additionally, logic input
screw terminals accept an external switch for connection to the Dante™ network.
The power module is equipped with an 80 Hz low-cut UniSteep® filter, three-position
input gain level selector (+30 dB, +40 dB and +50 dB), and red/green LED status
indicator, which can all be controlled remotely via third-party software.* Default settings
for the power module are as follows: low-cut filter o, +40 dB input gain, LEDs o.
To orient the microphone in the proper direction, twist the housing slightly in its wire
holder. (Clockwise rotation moves the microphone to the right; counterclockwise
rotation moves it to the left.)
The provided two-stage foam windscreen simply snaps over the head of the
microphone, eectively reducing noise from wind or ventilation air currents.
The power module allows for remote control of a high-pass filter to provide easy
switching from a flat frequency response to a low-end roll-o. The roll-o position
reduces the pickup of low-frequency ambient noise (such as trac, air-handling
systems, etc.), room reverberation and mechanically coupled vibrations. Mic gain and
LED ring color may also be controlled remotely through the power module.
The power module is equipped with logic input screw terminals which can be used
to trigger functions on compatible Dante-enabled devices, such as a video camera’s
pan/tilt or a rooms lighting preset.
The ATND8734a wall/ceiling plate power module is designed to be mounted in a
standard metal U.S. 2-gang electrical box. For safety and best performance, use the
electrical box only for the ATND8734a; do not include any AC power conductors.
The power module is powered by network PoE.
Connect the TA3F-type connector on the microphone cable to the TB3M-type
connector in the power module plate.
Avoid leaving the microphone in the open sun or in areas where temperatures exceed
110° F (43° C) for extended periods. Extremely high humidity should also be avoided.
Note: Audio-Technica has developed a special RFI-shielding mechanism, which is an
integral part of the connectors in the Engineered Sound® line. If you remove or replace
the connector, you may adversely aect the unit’s RFI immunity. Audio-Technica oers
a crimp tool (ATCT) and RFI shields that enable you to shorten the cable and correctly
reinstall the connector while maintaining the highest level of RFI immunity.
LES
S T
H
AN 2
TIMES
“
X
D
IS
120°
ANGLE OF
ACCEPTANCE
T
A
N
CE
“
X
”
”
120°120°
MIC
DISTANCE “X”
3 TIMES
IC B
Figure 1 Figure 2
The microphone comes equipped with a vinyl-coated steel hanger for positioning
over a choir/orchestra/stage, and a two-stage foam windscreen. The microphone is
![](/html/d0/d05e/d05e94bb270f416818b2e64618e00baf5b90b463941f1522b358511315a93d03/bg2.png)
ATND933aC & ATND933aWC
12" or more on axis
LEGEND
Frequency in Hertz
Response in dB
10 dB
100
50
200
10k
5k
1k
500
2k
20k
Roll-off
0.46"
11.6 mm
50'
15.2 m
0.13"
3.2 mm
1.08"
27.5 mm
0.48"
12.3 mm
0.33"
8.4 mm
3.16"
80.3 mm
1.85"
47.0 mm
1.45"
36.8 mm
0.46"
11.6 mm
50'
15.2 m
0.13"
3.2 mm
Architect’s and Engineer’s Specifications
The microphone shall be a fixed-charge condenser designed for permanent installation
or portable applications. It shall have a cardioid polar pattern with a uniform 120° angle
of acceptance and a frequency response of 30 Hz to 20,000 Hz. It shall be capable of
accepting optional interchangeable elements for additional polar patterns. It shall oer
outstanding rejection of radio frequency interference (RFI).
The microphone shall have a permanently attached 15.2 m (50') miniature cable
terminating in a special TA3F-type output connector designed to optimize RFI immunity.
The output connector shall connect to a TB3M-type jack on the included power module.
The output connection on the power module shall be an RJ-45 terminal using standard
network protocol. Logic input screw terminals shall be provided to accept commercially
available external switches. The power module shall be capable of driving a Dante
audio flow. The plate power module shall be designed to mount in a standard 2-gang
metal electrical box for ceiling or wall mounting. The power module shall contain an
80 Hz “low cut” switch to tailor the low-frequency response and minimize pickup of
unwanted sounds; it shall be selectable remotely via third-party software.* There
shall also be three gain levels (+30 dB, +40 dB, and +50 dB), selectable remotely via
third-party software. The power module shall include a red/green LED ring, controllable
via third-party software, and a removable, circular face plate that can be painted with
commercially available spray paint.
An adjustable steel wire hanger shall be provided for suspended installations. The
steel wire hanger shall attach to the microphone body and allow for the positioning
of the microphone without the need for tools. A two-stage foam windscreen shall
also be included.
The microphone shall be a hanging design, with an overall length of 27.5 mm (1.08")
and a head diameter of 8.4 mm (0.33"). Weight shall be 5.5 grams (0.2 oz) without
cable. The microphone, cable and steel hanger shall be black [white].
The Audio-Technica ATND933aC [ATND933aWC] is specified.
* For a list of compatible third-party software consult the “About Network Audio” page
at Audio-Technica.com.
50'
15.2 m
0.13"
3.2 mm
3.16"
80.3 mm
12.3 mm
0.48"
0.33"
8.4 mm
1.08"
27.5 mm
1.45"
36.8 mm
0.46"
11.6 mm
1.85"
47.0 mm
Specifications
Element
Fixed-charge back plate, permanently
polarized condenser
Polar pattern
Frequency response
Low frequency roll-o
Maximum input levels
Cardioid
30-20,000 Hz
80 Hz, 18 dB/octave
-15 dBu @ +30 dB gain
-25 dBu @ +40 dB gain
-35 dBu @ +50 dB gain
1
Signal-to-noise ratio
Weight
68 dB, 1 kHz at 1 Pa
Microphone: 5.5 g (0.2 oz)
Power module: 330 g (11.6 oz)
Dimensions
Microphone: 27.5 mm (1.08") long,
8.4 mm (0.33") head diameter
Power module: 148.0 mm (5.83")
diameter x 47.0 mm (1.85") depth
Output connector
Dante network
Power module: RJ-45
Physical level: standard Ethernet
Connector: single RJ45
Cable quality: Shielded CAT5 or CAT6
recommended
Transmission speed: 100 Mbps
Optional interchangeable elements
ESE-O omnidirectional (360°)
ESE-H hypercardioid (100°)
ESE-ML MicroLine
Audio-Technica case style
M25
Accessories furnished
ATND933aC
ATND8734a wall/ceiling plate power
module with Dante
AT8109 two-stage foam windscreen;
AT8452 steel hanger
ATND933aWC
ATND8734a wall/ceiling plate
power module with Dante
output; AT8109(WH) two-stage foam
windscreen; AT8452(WH) steel hanger
In the interest of standards development, A.T.U.S. oers full details
1 Pascal = 10 dynes/cm
1
Typical, A-weighted, using Audio Precision System One.
on its test methods to other industry
professionals on request.
2
= 10 microbars = 94 dB SPL
Specifications are subject to change without notice.
frequency response: 30– 20,000 Hz polar pattern
330˚
300˚
270˚
Response in dB
240˚
SCALE IS 5 DECIBELS PER DIVISION
210˚
LEGEND
50
200
100
12" or more on axis
Roll-off
500
1k
Frequency in Hertz
10 dB
5k
2k
10k
20k
®
(90°)
™
0˚
30˚
150˚
180˚
network output;
™
network
60˚
90˚
120˚
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
5.83"
148.0 mm
Audio-Technica Corporation
www.audio-technica.com
©2018 Audio-Technica 0001-0353-00