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Audio-Technica AT4021

Cardioid Pencil Condenser Microphone

The AT4021 is a cardioid electret FET condenser with a small-diaphragm capsule designed for flat, extended frequency response.

The mic’s published frequency-response graph shows an essentially flat response from 20Hz - 20kHz, with a gentle -2dB dip at 80Hz, a sharp rise to +2dB at 6500Hz, and a gentle presence peak to +2dB above 10kHz.

The AT4021 capsule uses a single 16.3mm diaphragm made of 2-micron PPS. (Polyphenylene Sulfide, or PPS, is a plastic resin known for its thermal and dimensional stability, as well as its resistance to corrosion.) A modified version of this capsule can be found in the XY-stereo mic AT8022.

The mic was released in 2008, along with a companion omni mic, the AT4022.

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The mic was released in 2008.

Specifications

Frequency Response - CardioidClick Graph to Compare!

Pickup Patterns	Pads & Filters
Cardioid (19.9 mV/Pa; 20 - 20,000 Hz)	Pad: -10dB (Via Switch) Filter: HPF: -12dB/octave @ 80Hz (Via Switch)

Capsule Dimensions	Impedance	SPL/Noise
Diaphragm diameter: 16.3mm Capsule diameter: 21mm Diaphragm gauge: 2 microns	250 Ohms (Low)	Max SPL: 156 dB Self-noise: 14.0 dB(A)

Weight	Length	Max Diameter	Interface(s)
119g (4.20oz)	144mm (5.67'')	21mm (0.83'')	3-pin XLR male (1)

Power Specifications
Requires phantom power Phantom voltage: 48v

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