Audio Technica AT4040

Cardioid Condenser Side-Address Microphone

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The Audio Technica AT4040 Cardioid Condenser Side-Address Microphone

The AT4040 features an advanced large-diaphragm that is precisely tensioned to offer silky smooth and natural sonic characteristics. A beautiful unity of technical brilliance and artistic inspiration, the AT4040 offers exceptionally low noise, a broad dynamic range and is capable of handling high SPL for greatest versatility. This spectacular microphone can be used with firm confidence in a broad variety of studio and live recording situations, even under the strict demands of digital recording systems. The AT4040’s low-noise circuitry is symmetrical and transformerless, making for exceptional transient response and clean output signals for smooth reproduction of even the most difficult instruments and/or sound effects.

Click here to hear some sample audio clips recorded with the AT4040!

AT4040 Features:

  1. Precision-machined, nickel-plated brass, acoustic element baffle provides enhanced element stability and optimal sensitivity.
  2. Technically advanced large diaphragm tensioned specifically to provide smooth, natural sonic characteristics.
  3. Externally polarized (DC bias) true condenser design.
  4. Open acoustical environment of the symmetrical housing assembly minimizes unwanted internal reflections.
  5. Transformerless circuitry virtually eliminates low-frequency distortion and provides superior correlation of highspeed transients.
  6. State-of-the-art surface-mount electronics ensure compliance with AT’s stringent consistency and reliability standards.
Other Features:
  • Switchable 80 Hz hi-pass filter and 10 dB pad
  • Exceptionally low noise, wide dynamic range and high-SPL capability for greatest versatility
  • Custom shock mount provides superior isolation
  • Also found as: AT-4040
  • Weight: 12.7 oz. (0.36 kg)
  • Dimensions: 2-1/8" (53.4 mm) W x 6-11/16" (170 mm) H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

What's In The Box?

  1. (1) AT4040 Microphone
  2. (1) Owner's Manual (see Product Summary below for PDF)
  3. (1) AT8449 Shock Mount (For 5/8"-27 Threaded Stands)
  4. (1) Microphone Dust Cover
  5. (1) Protective Carrying Case


  • Element:
    • Externally polarized (DC bias) condenser
  • Polar Pattern:
    • Cardioid
  • Frequency Response:
    • 20-20,000 Hz
  • Low Frequency Roll-Off:
    • 80 Hz, 12 dB/octave
  • Open Circuit Sensitivity:
    • -32 dB (25.1 mV) re 1V at 1 Pa
  • Impedance:
    • 100 ohms
  • Maximum Input Sound Level:
    • 145 dB SPL, 1 kHz @ 1% T.H.D.; 155 dB SPL, with 10 dB pad (nominal)
  • Noise:
    • 12 dB SPL
  • Dynamic Range (typical):
    • 133 dB, 1 kHz @ Max SPL
  • Signal-to-Noise Ratio*:
    • 82 dB, 1 kHz @ 1 Pa
  • Phantom Power Requirements:
    • 48V DC, 4.2 mA typical
  • Switches:
    • Flat, roll-off; 10 dB pad (nominal)
  • Output Connector:
    • Integral 3-pin XLRM-type

AT4040 Polar Pattern & Frequency Response Charts:

Microphone Specifications

Microphone Type
This is the type of microphone included with the purchase of the item.

Wireless:All of these microphones can be used without the necessity of wires or cables to connect them. They usually come with a receiver that connects to the input device where the audio signal is being sent.

Shotgun: These microphones are suspended on a boom and are used primarily in video production and broadcasting.

Lavaliere: These microphones are clipped on to the lapel or tie of the talent for broadcast and video production audio.

Table Top: These microphones are designed with a built in stand or to be placed on a table top stand to be used for broadcasting and podcasting applications.

Headset: These microphones are to be worn on the head typically for live performance and theater production.

Handheld: These microphones are held in the hand and are used in a wide range of applications primarily vocals and public address.

Clamp On: These microphones attach directly on to an instrument.

Drum Package: These microphones are an all in one package for drums typically made of dynamic Kick, Snare, Tom, and a stereo condenser pair of overhead mics for Cymbals.

Designed Applications
The intended application the microphone is designed for.
Acoustic Guitar
Bass Amps
Guitar Amps
Spoken Word
Public Address
Number of Microphones
This is the number of microphones that are included in the package.
Polar Patterns
The polar pattern of a microphone determines how sensitive it is to receiving sounds as they arrive at different angles.
Transducer Type
The transducer type is the manner in which the audio signal is converted into an electrical signal.
The configuration of the capsule determining on which side the microphone is sung or spoken into.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
20 - 20000 Hz
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
-32 dB
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
82 dB
Maximum Sound Pressure Level
This is the maximum sound pressure level that the microphone is capable of accepting and transferring into an electrical signal.
145 dB
Output Impedance
This is the amount of impedance that the microphone allows.
100 ohms
A pad is a term used for built in attenuation in a microphone or pro audio channel strip.
Roll Off Filter
A low frequency filter found on microphones commonly expressed with a threshold in Hz and a slope in -dB/Octave.
80 Hz (12 dB/octave)
Power Requirement
Condenser microphones require an external power source to operate. Typically a +48v DC charge commonly refereed to as Phantom Power.
+48v (Phantom)
Connection Type
This is the manner in which the microphone connects to the source unit. For wired microphones, this is the connector that directly connects the microphone to the mixer (or other input source unit). For wireless microphones, this is the connection that connects the microphones receiver to the mixer (or other input source unit).
The overall length of the microphone.
Diameter (inches)
A straight line running from one side of a circle or other rounded geometric figure through the center to the other side, or the length of this line

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

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Product Summary


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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Audio Technica AT4040

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Audio Technica AT4040

Cardioid Condenser Side-Address Microphone


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