The Schoeps MK 21 is a wide cardioid condenser microphone capsule offering a frequency response from 30 Hz to 29 kHz (or up to 44 kHz with the CMC 6xt), 14 mV/Pa sensitivity, and an equivalent noise level of 13 dB(A), making it a high-fidelity, low-noise solution for precision audio capture.

Polar Pattern and Sound Characteristics

The MK 21 features a wide cardioid polar pattern that sits between omnidirectional and cardioid, providing both directivity and warmth. This hybrid pattern delivers a smooth low-frequency response superior to that of standard cardioids and significantly reduces proximity effect. The capsule’s consistent polar behaviour across the frequency spectrum ensures accurate capture of lateral direct sound and room reflections without introducing tonal coloration.

Applications and Usage

Engineers frequently use the MK 21 as a main microphone or soloist mic due to its natural tonality and subtle directional control. In stereo configurations, it performs effectively in near-coincident setups, particularly with a spacing of 30 cm and an angle of ±45°, where it provides spatial realism with minimal phasing. However, its low directivity index makes it unsuitable for traditional X/Y stereo, while MS recording and spot miking at closer distances remain viable options.

Build and Finish

With a compact profile measuring 22 mm in length and 20 mm in diameter, the capsule weighs only 17 grams. It comes in a matte grey finish with optional colours such as Chromagreen and Smoked Silver, the latter emulating the classic Schoeps nickel aesthetic. The MK 21 supports a maximum SPL of 131 dB at <0.5% THD, making it suitable for a wide range of acoustic environments.