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OmnidirectionalMicrotech Gefell M 221

Detachable-Capsule Condenser Microphone

The M 221 is a high-fidelity omnidirectional condenser microphone based on the company’s MK221, half-inch nickel-diaphragm capsule design.

The same capsule is used on the Josephson c617 Set, also a high-fidelity omni condenser.

The MK221 capsule is from MTG’s measurement-microphone business. The nickel diaphragm is 2 microns thick. It is polarized at 200V by the M221 circuit.

Other half-inch capsules can be used with the M 221 head amplifier, as well.

The mic’s published frequency response is nominally flat from 20Hz–20kHz, with less than 1dB variation in the high frequencies. According to MTG, the mic’s response is flat (±2dB) down to 3.5Hz.

The M 221 ships with two spherical acoustic equalizers. Either can be slid onto the neck of the microphone after removing the capsule.

The KA 3 is 30mm rubber sphere; it provides a 3dB boost from 4kHz–12kHz. The KA 4, a 40mm sphere, provides a 3dB boost from 1kHz–12kHz.

The Microtech Gefell M 221 is also known as: M221.

The mic was released in 2011.


Compatible Capsules
Microtech Gefell MK221Omnidirectional Microtech Gefell MK221
13mm Omnidirectional capsule
Sensitivity: mV/Pa
Freq. Resp.: 10 - 20,000 Hz
MSRP: $695 | Still In Production
Pads & Filters Impedance SPL/Noise
Diameter n/a
Diaphragm gauge: 2 microns
100 Ohms (Low) Max SPL: 136 dB
Self-noise: 15.0 dB(A)
Weight Length Max Diameter Interface(s)
123g (4.34oz) 170mm (6.69'') n/a
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48±4v

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