Audio-Technica AT4021

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

Frequency response

Angle

Distance

Frequency response: from the spec sheet, p. 2. Printed under the graph: "12\" or more on axis" (30 cm or more). Room and smoothing not stated.

Dashed: outside the rated range, or simulated (other angles and distances). Hover or tap the graphs for values.

Polar pattern: from the spec sheet, p. 2. Full circle, 0° at the top, 5 dB per division. Measuring conditions not stated.

From the spec sheet
Capsule	low-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-noise	14 dB(A), typical, A-weighted (Audio Precision System One). "14 dB SPL", footnote "Typical, A-weighted, using Audio Precision System One".
Max SPL	146 dB SPL, 1 kHz, 1% THD; also 156 dB SPL, with 10 dB pad (nominal)
Signal-to-noise ratio	80 dB, 1 kHz at 1 Pa; typical, A-weighted
Dynamic range	132 dB, 1 kHz at max SPL, typical
Output impedance	250 ohm. Low impedance balanced.
Rated frequency range	20 Hz to 20 kHz. Tolerance not stated.
Powering	phantom 48 V DC. "48V DC, 3.0 mA typical".
Current draw	3 mA, typical
Low cut	off, 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)".
Connector	XLR-3 male (integral). "Integral 3-pin XLRM-type".
Weight	119 g. "119 g (4.2 oz)".
Dimensions	21 × 144 mm. Diameter × length: "144.0 mm (5.67") long, 21.0 mm (0.83") diameter".
Supplied accessories	AT8405a stand clamp for 5/8"-27 threaded stands; AT8159 windscreen; protective carrying case. The 2008 leaflet says just "windscreen".
Output	Low impedance balanced, pin 2 hot	p. 1
Angle of acceptance	120° (uniform)
Case style	S1	p. 2
Operating temperature	Avoid more than 43 °C (110 °F) for long periods, and very high humidity	p. 1

AT4021 Cardioid Condenser End-Address Microphone (spec sheet, 0001-0206-01)
Spec sheet · 2010 · 2 pages · 0.4 MB
Download PDF Original on docs.audio-technica.com
AT4021 Cardioid Condenser Microphone (user leaflet, P52064)
User guide · 2008 · 1 page · 0.3 MB
Download PDF Recording Hacks copy

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