Audio-Technica 40 series studio microphones manual Features, Description

AT4040

Cardioid Condenser Side-Address Microphone

Features

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

•Technically advanced large diaphragm tensioned specifically to provide smooth, natural sonic characteristics

•Transformer less circuity virtually eliminates low-frequency distortion and provides superior correlation of the high-speed transients

•Exceptionally low self-noise, wide dynamic range and high SPL capability

•Precision-machined, nickel-plated brass, acoustic element baffle provides enhanced element stability and optimal sensitivity

•Open acoustical environment of the symmetrical housing assembly minimizes unwanted internal reflections

•Custom shock mount provides superior isolation

•Integral 80 Hz high-pass filter 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 AT4040 is a large-diaphragm side-address externally polarized (DC bias) condenser microphone with a cardioid polar pattern. It is designed to meet the most critical acoustic requirements of professional recording, broadcast and sound reinforcement.

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 in controlling feedback, reducing pickup of unwanted sounds and providing isolation between performers.

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 flat response or low-frequency roll-off (via integral 80 Hz high-pass filter).

The microphone is enclosed in a rugged housing. The included AT8449 shock mount provides superior isolation and permits mounting on any microphone stand with 5/8"-27 threads. A dust cover and a protective carrying case are also included.

40 series studio microphones

Operation and Maintenance

The AT4040 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.

A raised Audio-Technica emblem is on the front of the microphone. Position this side of the microphone toward the sound source.

An integral 80 Hz high-pass filter provides easy switching from a flat frequency response to a low-end roll-off. The roll-off position reduces the microphone’s sensitivity to popping in close vocal use. It also reduces the pickup of low-frequency ambient noise (such as traffic, air-handling systems, etc.), room reverberation and mechanically coupled vibrations. To engage the high-pass filter, 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 flexible use with a wide range of users and system configurations. To engage the 10 dB pad, slide the switch toward the -10 position.

In use, secure the cable to the mic stand or boom, leaving a slack loop at the mic. This will ensure the most effective shock isolation and reduce the possibility of accidentally pulling the microphone out of its mount.

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 Specifications

The microphone shall be a large-diaphragm side-address externally polarized (DC bias) 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 145 dB (155 dB with 10 dB pad) with a dynamic range of 133 dB. Nominal open-circuit output voltage shall be 25.1 mV at 1V, 1 Pascal. Output shall be low impedance balanced (100 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 flat response or 80 Hz low-frequency roll-off.

The microphone shall be 170.0 mm (6.69") long and have a maximum body diameter of 53.4 mm (2.10"). Weight shall be 360 grams (12.7 oz). The microphone shall include a shock mount, a dust cover and a protective carrying case.

The Audio-Technica AT4040 is specified.