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Audio-Technica ATM31

Pricing & Availability

  • MSRP: n/a
  • Discontinued


ATM31 Documentation

CardioidAudio-Technica ATM31

Cardioid Condenser Microphone

The ATM31 is a vocal condenser microphone with a fixed-charge electret capsule. It requires the use of a 1.5V “AA” battery, which fits into the 21mm shaft of the microphone body (where it would reportedly last for several thousand hours of usage).

The electret capsule is a small-diaphragm design with a 4-micron, low-mass diaphragm.

The mic body houses the amplifier circuit, the aforementioned AA/UM3 battery compartment, a power switch, and, according to the circuit diagram, a very small transformer that steps the mic’s output impedance down from 2000 to 600Ω.

According to the owner’s manual, this head amplifier can be used with other electret-capsule heads, although no specific models are named.

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Pickup Patterns Pads & Filters
Cardioid (1.7 mV/Pa; 60 - 20,000 Hz)
Capsule Dimensions Impedance SPL/Noise
Diameter n/a
Diaphragm gauge: 4 microns
600 Ohms (Low) Max SPL: 125 dB
Weight Length Max Diameter Interface(s)
185g (6.53oz) 204mm (8.03'') n/a
  • 3-pin XLR male (1)
Power Specifications
  • Has battery compartment (1.5V AA/UM3)

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