"If I only had one microphone of a given pattern that I could use, it would be the Collette MK21, which is Schoeps’ sub-cardioid or wide cardioid. You can almost use it as an omnidirectional mic, but you can also use it as a spot mic — it will work and it just sounds great for anything — depending upon the location."
Resolution Magazine June/July 2021
Description 
Practice When used as a spot microphone, the distance from the sound source should be slightly smaller than when using a cardioid due to lower directivity index.
The low directivity of this capsule type prevents it from generating large enough level differences for X/Y use, though MS and near-coincident spacings are often successful.
Technical Specifications Pickup pattern | Wide Cardioid |
| Frequency range | 30 Hz - 29 kHz with CMC 6 / CMR 30 Hz - 44 kHz with CMC 6xt |
| Sensitivity | -37 dB (V/Pa), 14 mV/Pa with CMC 6 |
| Equivalent noise level (A-weighted) | 13 dB with CMC 6 |
| Equivalent noise level (CCIR) | 23 dB with CMC 6 |
| Signal-to-noise ratio (A-weighted) | 81 dB with CMC 6 |
| Maximum sound pressure level (THD < 0.5 %) | 131 dB-SPL with CMC 6 |
| Length | 22 mm |
| Diameter | 20 mm |
| Weight | 17 g |
| Surface finish | matte gray |
Graphics 
Frequency response and polar diagram MK 21 + CMC 6 and CCM 21
Variants & Options No. 191701 matching: Although our normal production tolerances are very close, we can deliver specially matched capsule pairs for a small extra charge.
No. 191102 custom color: nickel, chromagreen, other custom colors on request
No. 191201 custom engraving