Audio-Technica ATND931aML Datasheet

Network Microphones

ATND931aML & ATND931aWML MicroLine® Condenser

Gooseneck Microphone with Dante™ Network Output

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.

The microphone is enclosed in a rugged housing with a low-reﬂectance black ﬁnish and comes equipped with a wall/ceiling plate power module and a two-stage foam windscreen. The microphone is also available with white housing and windscreen as the ATND931aWML.

Installation and Operation

A uniform 90° 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. 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.

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

• MicroLine® polar pattern provides narrow 90º 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 oers outstanding rejection of radio frequency interference (RFI)

• UniSteep® ﬁlter provides a steep low-frequency attenuation to minimize pickup of undesired ambient noise

• Easy-to-adjust, rugged, small-diameter gooseneck with virtually no “memory” permits quick positioning into desired shape

• Available interchangeable elements permit angle of acceptance from 90° to 360°

• Ideal for boardrooms, school and government settings, teleconferencing, houses of worship and other installed applications

• Available in two colors: black (ATND931aML) and white (ATND931aWML)

Description

The ATND931aML is a wide-range miniature condenser microphone with a MicroLine® (line cardioid) polar pattern. It is designed for quality sound reinforcement. The small-diameter gooseneck design permits highly ﬂexible positioning while maintaining a smooth, well-contoured appearance. The combination of small size and excellent response makes the microphone ideal for boardrooms, school and government settings, teleconferencing, houses of worship and other installed applications.

Width of pickup is approximately 1.5 times the distance to the closest source. If additional mics are needed for wide sources, they should be positioned apart laterally at least 1.5 times the distance to the front source, to avoid phase cancellation (Fig. 1).

The provided two-stage foam windscreen simply snaps over the head of the microphone, eectively reducing noise from wind or ventilation air currents.

The power module allows for remote control of a low-cut 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 trac, 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 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.

The microphone is equipped with UniGuard® RFI-shielding technology, which oers outstanding rejection of radio frequency interference (RFI).

The microphone’s MicroLine® (line cardioid) polar pattern provides a 90° angle of acceptance. Additional interchangeable elements with omnidirectional (360°), cardioid (120°) and hypercardioid (100°) pickup patterns are available.

The microphone’s 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

Figure 1

MIC B

MIC A

1. 5 TIMES

DISTANCE “X”

ATND931aML & ATND931aWML

0.46"

0.24"

0.31"

.0 mm

LEGEND

270˚

12" or more on axis

LEGEND

Frequency in Hertz

Response in dB

10 dB

100

200

10k

500

20k

Roll-off

Architect’s and Engineer’s Speciﬁcations

The microphone shall be a ﬁxed-charge condenser designed for permanent installation. It shall have a MicroLine® (line cardioid) polar pattern with a uniform 90° 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 oer outstanding rejection of radio frequency interference (RFI).

The microphone shall incorporate 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.

A two-stage foam windscreen shall be included with the microphone.

The microphone shall be a small-diameter gooseneck design, with an overall length of 271.4 mm (10.7") and a head diameter of 8.0 mm (0.31"). Weight shall be 43 grams (1.5 oz). The microphone shall be black [white].

The Audio-Technica ATND931aML [ATND931aWML] is speciﬁed.

* For a list of compatible third-party software consult the “About Network Audio” page at Audio-Technica.com.

.6 mm

6.0 mm

10.7"

271.4 mm

5.17"

131.3 mm

8.0 mm

Speciﬁcations

Element

Polar pattern

Frequency response Low frequency roll-o Maximum input levels

Signal-to-noise ratio

Weight

Dimensions

Output connector

Dante network

Optional interchangeable elements

Audio-Technica case style

Accessories furnished

ATND931aML

ATND931aWML

In the interest of standards development, A.T.U.S. oers full details

1 Pascal = 10 dynes/cm

Typical, A-weighted, using Audio Precision System One.

on its test methods to other industry

professionals on request.

= 10 microbars = 94 dB SPL

Speciﬁcations are subject to change without notice.

Fixed-charge back plate, permanently polarized condenser MicroLine

(line 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

73 dB, 1 kHz at 1 Pa Microphone: 43 g (1.5 oz) Power module: 330 g (11.6 oz)

271.4 mm (10.7") long, 8.0 mm (0.31") head diameter, 11.6 mm (0.46") base diameter Power module: 148.0 mm (5.83") diameter x 47.0 mm (1.85") depth Power module: RJ-45 Physical level: standard Ethernet Connector: single RJ45 Cable quality: Shielded CAT5 or CAT6 recommended Transmission speed: 100 Mbps ESE-O omnidirectional (360°) ESE-C cardioid (120°) ESE-H hypercardioid (100°) M42

ATND8734a wall/ceiling plate power module with Dante

™

network output; AT8138 two-stage foam windscreen ATND8734a wall/ceiling plate power module with Dante

™

network output; AT8138(WH) two-stage foam windscreen

5.83"

148.0 mm

frequency response: 30– 20,000 Hz polar pattern

0˚

30˚

330˚

1.85"

1.45"

36.8 mm

3.16"

80.3 mm

200

100

12" or more on axis Roll-off

500

Frequency in Hertz

10 dB

10k

20k

300˚

Response in dB

240˚

210˚

SCALE IS 5 DECIBELS PER DIVISION

60˚

90˚

120˚

LEGEND

200 Hz

150˚

180˚

1 kHz

5 kHz

8 kHz

Audio-Technica Corporation