Audio-Technica AT4021 Datasheet

AT4021

Cardioid Condenser End-Address Microphone

Features

• Specially engineered to meet the most critical acoustic requirements of professional recording, broadcast and sound reinforcement

• Low self-noise perfectly suited for the most sophisticated recording equipment

• Low-mass diaphragm improves transient response, increases response bandwidth and reduces handling and mechanical noise transfer

• Cardioid polar pattern reduces pickup of sounds from the sides and rear, improving isolation of desired sound source

• Rugged design and construction for reliable performance

• Integral 80 Hz high-pass lter switch and 10 dB pad switch

• State-of-the-art design and manufacturing techniques ensure compliance with A-T’s stringent consistency and reliability standards

Description

The AT4021 is a xed-charge condenser microphone with a cardioid polar pattern. It is designed to meet the demands of critical studio and live applications.

40 series studio microphones

An integral 80 Hz high-pass lter provides easy switching from a at frequency response to a low-end roll-off. The roll-off position reduces the pickup of low-frequency ambient noise (such as trafc, air-handling systems, etc.), room reverberation and mechanically coupled vibrations. To engage the high-pass lter, slide the switch toward the “bent” line.

The microphone is also equipped with a switchable 10 dB pad that lowers the microphone’s sensitivity, thus providing higher SPL capability for exible use with a wide range of users and system congurations. To engage the 10 dB pad, slide the switch toward the -10 position.

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.

Architect’s and Engineer’s Specications

The microphone shall be a xed-charge condenser. It shall have a cardioid polar pattern with a uniform 120° angle of acceptance and a frequency response of 20 Hz to 20,000 Hz. The microphone shall operate from an external 48V DC phantom power source. It shall be capable of handling sound input levels up to 146 dB (156 dB with 10 dB pad) with a dynamic range of 132 dB. Nominal open-circuit output voltage shall be 19.9 mV at 1V, 1 Pascal. Output shall be low impedance balanced (250 ohms).

The output of the microphone shall be a 3-pin XLRM-type connector.

The microphone shall be equipped with a switchable 10 dB pad and a switch that permits choice of at response or 80 Hz low-frequency roll-off.

The microphone shall be 144.0 mm (5.67") long and have a diameter of

21.0 mm (0.83"). Weight shall be 119 grams (4.2 oz). The microphone shall include a stand clamp, a windscreen and a protective carrying case.

The Audio-Technica AT4021 is specied.

The microphone requires 48V phantom power for operation.

The cardioid polar pattern of the microphone is more sensitive to sound originating directly in front of the element, making it useful for controlling feedback and reducing pickup of unwanted sounds.

The output of the microphone is a 3-pin XLRM-type connector.

The microphone is equipped with a switchable 10 dB pad and a switch that permits choice of at response or low-frequency roll-off (via integral 80 Hz high-pass lter).

The microphone is enclosed in a rugged housing. The included AT8405a stand clamp permits mounting on any microphone stand with 5/8"-27 threads. A windscreen and a protective carrying case are also included.

Operation and Maintenance

The AT4021 requires 48V phantom power for operation.

Output is low impedance (Lo-Z) balanced. The signal appears across Pins 2 and 3; Pin 1 is ground (shield). Output phase is “Pin 2 hot”— positive acoustic pressure produces positive voltage at Pin 2.

To avoid phase cancellation and poor sound, all mic cables must be wired consistently: Pin 1-to-Pin 1, etc.

Specications

Element

Polar pattern

Frequency response

Low frequency roll-off

Open circuit sensitivity

Impedance

Maximum input sound level

Noise

Dynamic range (typical)

Signal-to-noise ratio1

Phantom power requirements

Switch(es)

Weight

Dimensions

Output connector

Audio-Technica case style

Accessories furnished

In the inter est of standards devel opment, A.T.U.S.

offers full details on its test me thods to other industr y

1 Pascal = 1 0 dynes/cm

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

Specication s are subject to chang e without notice.

professional s on request.

= 10 microb ars = 94 dB SPL

AT4021

Fixed-charge back plate, permanently polarized condenser Cardioid 20-20,000 Hz 80 Hz, 12 dB/octave –34 dB (19.9 mV) re 1V at 1 Pa 250 ohms 146 dB SPL, 1 kHz at 1% T.H.D.; 156 dB SPL, with 10 dB pad (nominal)

14 dB SPL 132 dB, 1 kHz at Max SPL 80 dB, 1 kHz at 1 Pa 48V DC, 3.0 mA typical Flat, roll-off; 10 dB pad (nominal) 119 g (4.2 oz)

144.0 mm (5.67") long,

21.0 mm (0.83") diameter Integral 3-pin XLRM-type S1 AT8405a stand clamp for 5/8"-27 threaded stands; AT8159 windscreen; protective carrying case

229

frequency response: 20– 20,000 Hz

10 dB

100

12" or more on axis Roll-off

330˚

200

Frequency in Hertz

0˚

180˚

500

30˚

150˚

60˚

120˚

10k

90˚

LEGEND

200 Hz

1 kHz 5 kHz 8 kHz

LEGEND

polar pattern

300˚

270˚

240˚

210˚

SCALE IS 5 DECIBELS PER DIVISION

Response in dB

20k