Audio-Technica ES931ML Datasheet

ES931ML/MIC & ES931WML/MIC

MicroLine® Condenser Gooseneck Microphones

Installation and Operation

The ES931ML/MIC requires a compatible Audio-Technica power module (not included) for 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.

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).

Engineered Sound® Microphones

Features

• MicroLine® polar pattern provides narrow 90° acceptance angle

• Low-proﬁle design with low-reﬂectance ﬁnish for minimum visibility

• Superior o-axis rejection for maximum gain before feedback

• UniGuard® RFI-shielding technology oers outstanding rejection of radio frequency interference (RFI)

• 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 (ES931ML/MIC) and white (ES931WML/MIC)

Description

The ES931ML/MIC 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.

The microphone requires a compatible Audio-Technica power module (not included) for operation.

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

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 aect the unit’s RFI immunity.

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 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. The microphone shall operate from an Audio-Technica power module (not included). It shall be capable of handling sound input levels up to 133 dB with a dynamic range of 109 dB. Nominal open-circuit output voltage shall be 17.7 mV at 1V, 1 Pascal. 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.

A two-stage foam windscreen shall be included.

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 ES931ML/MIC [ES931WML/MIC] is speciﬁed.

The microphone’s free end connects to a compatible Audio-Technica power module (not included) via a special TA3F-type connector designed to optimize RFI immunity.

The microphone is enclosed in a rugged housing with a low-reﬂectance black ﬁnish and comes equipped with a two-stage foam windscreen. It is also available with white housing and windscreen as the ES931WML/MIC.

Figure 1

MIC B

MIC A

1. 5 TIMES

DISTANCE “X”

ES931ML/MIC & ES931WML/MIC

8 kHz

SCALE IS 5 DECIBELS PER DIVISION

270˚

LEGEND

Response in dB

0.31"

8.0 mm

0.24"

6.0 mm

5.17"

131.3 mm

271.4 mm

10.7"

Speciﬁcations

Element

Polar pattern

Frequency response

Open circuit sensitivity

Maximum input sound level

Dynamic range (typical)

Signal-to-noise ratio

Weight

Dimensions

Output connector

Optional interchangeable elements

Audio-Technica case style

Accessories furnished

ES931ML/MIC

ES931WML/MIC

Compatible power modules

Speciﬁcations derived by using AT8538 power module.

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 –35 dB (17.7 mV) re 1V at 1 Pa 133 dB SPL, 1 kHz at 1% T.H.D. 109 dB, 1 kHz at Max SPL 70 dB, 1 kHz at 1 Pa

43 g (1.5 oz)

271.4 mm (10.7") long, 8.0 mm (0.31") head diameter, 11.6 mm (0.46") base diameter TA3F-type ESE-O omnidirectional (360°) ESE-C cardioid (120°) ESE-H hypercardioid (100°) M42

AT8138 two-stage foam windscreen AT8138(WH) two-stage foam windscreen AT8534 wall/ceiling plate power module; AT8538 power module; ATND8734a network audio microphone power module

0.46"

11.6 mm

frequency response: 30– 20,000 Hz

polar pattern

330˚

300˚

240˚

210˚

100

500

200

Frequency in Hertz

12" or more on axis

0˚

30˚

150˚

180˚

60˚

90˚

120˚

LEGEND

200 Hz

1 kHz 5 kHz

10 dB

10k

20k

Audio-Technica Corporation