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AT4040 Microphone Sets

CardioidAudio-Technica AT4040

Cardioid Condenser Microphone

The AT4040 is a FET condenser microphone with a fixed cardioid pickup pattern and a low-noise, transformerless output circuit.

AT4040 CutawayThe capsule is an edge-terminated design, with a 2-micron diaphragm. It is mounted within an “acoustically open” headbasket to minimize sound-muddying reflections. Although it is described in some literature as a “large diaphragm” capsule, its active diaphragm area measures only 20.4mm in diameter, falling short of the traditional 25mm cutoff for the “large” classification.

The mic’s amplifier circuit is constructed with surface-mount components; according to Electronic Musician, it was the first Audio-Technica microphone to use surface-mount rather than through-hole construction.


  • Technically-advanced [capsule] tensioned specifically to provide smooth, natural sonic characteristics
  • Externally polarized (DC bias) true condenser design
  • Exceptionally low noise, wide dynamic range and high-SPL capability for greatest versatility
  • Transformerless circuitry virtually eliminates low-frequency distortion and provides superior correlation of high-speed transients
  • 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
  • State-of-the-art surface-mount electronics ensure compliance with A-T’s stringent consistency and reliability standards
  • Custom shock mount provides superior isolation
  • Switchable 80 Hz hi-pass filter and 10 dB pad

Electronic Musician, 2003

In tests, the 4040 gave me bright but smooth highs, flat or slightly scooped low mids, and solid lows beneath the scoop. These results are borne out by the mic’s frequency plot… Also notable were the mic’s exceptionally good transient response and relatively open cardioid pickup pattern.

The Audio-Technica AT4040 is also known as: 4040.


Frequency Response - CardioidClick Graph to Compare!
AT4040 Cardioid Frequency Response Chart
Pickup Patterns Pads & Filters
Cardioid (25.1 mV/Pa; 20-20,000 Hz)
  • Pad: -10dB (Via Switch)
  • Filter: HPF @ 80Hz (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 20.4mm
Diaphragm gauge: 2 microns
100 Ohms (Low) Max SPL: 145 dB
Self-noise: 12.0 dB(A)
Weight Length Max Diameter Interface(s)
n/a 170mm (6.69'') 53mm (2.09'')
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48v

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