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40 series studio microphones
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 specically 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 bafe
provides enhanced element stability and optimal sensitivity
• Open acoustical environment of the symmetrical housing
assembly minimizes unwanted internal reections
• Custom shock mount provides superior isolation
• 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 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 at response or low-frequency roll-off (via integral
80 Hz high-pass lter).
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.
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 lter provides easy switching from a at
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 trafc, 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 congurations. 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 Specications
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 at 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 specied.