Mic Archive
Audio-Technica AT4021
Photo: Audio-Technica, from its spec sheet, p. 1.

Audio-Technica

Audio-Technica AT4021

Small-diaphragm cardioid condenser (fixed-charge back plate) with 80 Hz high-pass and 10 dB pad

Power Phantom 48 V DC.

Type
Condenser (electret)
Pattern
Cardioid
Sensitivity
−34 dBV/Pa
vs 75 end-address condensers

More output than 66% of 75 end-address condensers.

Each stripe is one end-address condenser with a published sensitivity, and each bar counts them; further right means more output. This mic is in blue.

  • Among 204 condensers: more output than 69%
  • Among 311 mics: more output than 79%
Self-noise
14 dB(A)
vs 104 end-address condensers

Quieter than 71% of 104 end-address condensers.

Each stripe is one end-address condenser with a published self-noise, and each bar counts them; further right means quieter. This mic is in blue.

  • Among 258 condensers: quieter than 59%
  • Among 272 mics: quieter than 60%
Max SPL
146 dB SPL
vs 110 end-address condensers

Takes louder sound than 91% of 110 end-address condensers.

Each stripe is one end-address condenser with a published max SPL, and each bar counts them; further right means it takes louder sound. This mic is in blue.

  • Among 277 condensers: takes louder sound than 84%
  • Among 343 mics: takes louder sound than 82%
Rated range
20 – 20k Hz
Released
2008

Frequency response

Instruments sources recommend it for most

1 of 2; all under Recommended for.

Angle

Distance

From the spec sheet, p. 2.

Polar pattern

Transparency

From the spec sheet, p. 2.

Compare with other mics

All specs

From the spec sheet
Capsulelow-mass small diaphragm, fixed-charge back plate"Low-mass diaphragm improves transient response, increases response bandwidth and reduces handling and mechanical noise transfer".p. 1
Sensitivity−34 dBV/Pa (19.9 mV/Pa)open circuit. "–34 dB (19.9 mV) re 1V at 1 Pa".p. 2
Self-noise14 dB(A)typical, A-weighted (Audio Precision System One). "14 dB SPL", footnote "Typical, A-weighted, using Audio Precision System One".
Max SPL146 dB SPL1 kHz, 1% THD; also 156 dB SPL, with 10 dB pad (nominal)
Signal-to-noise ratio80 dB1 kHz at 1 Pa; typical, A-weighted
Dynamic range132 dB1 kHz at max SPL, typical
Output impedance250 ohmLow impedance balanced.
Rated frequency range20 Hz to 20 kHzTolerance not stated.
Poweringphantom 48 V DC"48V DC, 3.0 mA typical".
Current draw3 mAtypical
Low cutoff, 80 Hz, 12 dB/octave; 80 Hz; 12 dB/octave; high-pass"80 Hz, 12 dB/octave"; switches "Flat, roll-off".
Pad−10 dB"10 dB pad (nominal)".
ConnectorXLR-3 male (integral)"Integral 3-pin XLRM-type".
Weight119 g"119 g (4.2 oz)".
Dimensions21 × 144 mmDiameter × length: "144.0 mm (5.67") long, 21.0 mm (0.83") diameter".
Supplied accessoriesAT8405a stand clamp for 5/8"-27 threaded stands; AT8159 windscreen; protective carrying caseThe 2008 leaflet says just "windscreen".
OutputLow impedance balanced, pin 2 hotp. 1
Angle of acceptance120° (uniform)
Case styleS1p. 2
Operating temperatureAvoid more than 43 °C (110 °F) for long periods, and very high humidityp. 1
From the Recording Hacks page
Released2008

Documents

Copies kept by Mic Archive (manufacturers move and drop their documents). Each is © Audio-Technica, unchanged, with its original address.

Product page on audio-technica.comRecording Hacks

Other mics

More from Audio-Technica

All 32 Audio-Technica mics

Other cardioid condenser mics

All 419 mics