The MK21Hg is an omnidirectional capsule that fits any of the Schoeps modular Colette series amplifier body.
This capsule type has a flat frequency response for frontal sound incidence. This yields a very natural sound when recordings are made within the reverberation radius, where the direct sound (frontal incidence) predominates over the reverberant sound (random angles of incidence).
Please note that there is some directivity at high frequencies due to the physics of sound wavelengths. Thus even with an omnidirectional microphone, it still matters which way the capsule is "aimed."
The MK 2 is often used for acoustical measurement, an application for which it has gained a considerable reputation.
A mechanical adapter (type AMBK 1, from 20 mm to 1" diameter) is available for calibration with B&K devices. Please note that because of dimensional tolerances, only the nickel-finish version of the MK 2 can be used with this adapter.
flat frequency response
corrected for the free (near) sound field
for use close to the sound source (frontal sound incidence)
Frequency range : 20 Hz - 20 kHz
Sensitivity : 16 mV/Pa
Equivalent noise level (A-weighted) : 11 dB-A
Equivalent noise level (CCIR) : 23 dB
Signal-to-noise ratio (A-weighted) : 83 dB-A
Maximum sound pressure level at 0.5% THD : 130 dB-SPL