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CardioidCascade Microphones M20u

Cardioid Condenser Microphone

The M20u is a large-diaphragm, fixed-cardioid condenser microphone with a transformer-coupled output.

The capsule is a single-membrane, externally biased (true condenser). Although previously reported here as a 5-micron edge-terminated model, we believe it is a 6-micron 32mm center-terminated K67 design, as is common in low-cost Chinese-manufactured condensers.

Onboard switches provide access to a high-pass filter (-6dB/octave @ 100Hz) and a preattenuation pad (-10dB).

M20u PCBThe M20u circuit is virtually identical to the MXL 2001/V67G, albeit with the addition of the pad and filter; the pad capacitor is most likely mounted on the back of the PCB, while the HPF capacitor is C7.

This two-stage transistor circuit feeds a low-ratio (~2:1) output transformer.

It ships with a soft pouch, suspension shockmount, and an aluminum flight case.

Cascade’s earlier M20 microphone was initially provided as a giveaway item by Bayview Pro Audio (parent company to Cascade Microphones); it was received as a garden-variety Chinese LDC — useful, but not special. It closely resembled the ADK A51 of that time. (Both ADK and Cascade have changed suppliers since then.)

M20u PCB photos: Chris Wood

The Cascade Microphones M20u is also known as: M20.

The mic was released in 2006.


Frequency Response - CardioidClick Graph to Compare!
M20u Cardioid Frequency Response Chart
Pickup Patterns Pads & Filters
Cardioid (11.8 mV/Pa; 20 - 20,000 Hz)
  • Pad: -10dB (Via Switch)
  • Filter: HPF: -6dB @ 100Hz (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 28mm
Diaphragm gauge: 5 microns
n/a Max SPL: 140 dB
Self-noise: 15.0 dB(A)
Weight Length Max Diameter Interface(s)
525g (18.52oz) 215mm (8.46'') 47mm (1.85'')
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48v

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