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OmnidirectionalCardioidBidirectionalAdvanced Audio Microphones CM-87

Multi-Pattern Condenser Microphone

The CM-87 is a large diaphragm, multipattern condenser microphone based on the Neumann U87. It is manufactured in China, initially by Feilo (through late 2008).

The CM-87 utilizes a dual-diaphragm 6-micron capsule and class A amplifier design. The FET is a 2SK170, known for low noise and high gain.

Advanced Audio CM-87 CircuitThe circuit uses discrete components on a single, two-sided PCB. (A photo of the rear side of the board is up on our Flickr site.)

Switches on the mic body provide a high pass filter (100 Hz), and the choice of three pickup patterns: omni, cardioid, and figure-of-8.

Also available is the CM87SE, which is intended to handle the fast and loud transients of close-mic drums. This is accomplished by employing a “more complex output transformer with dual windings and bi-metal laminations.”

The mic ships in a flight case with a spider shockmount and foam windscreen.

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The mic was released in 2006.


Frequency Response - OmnidirectionalClick Graph to Compare!
CM-87 Omnidirectional Frequency Response Chart
Frequency Response - CardioidClick Graph to Compare!
CM-87 Cardioid Frequency Response Chart
Frequency Response - BidirectionalClick Graph to Compare!
CM-87 Bidirectional Frequency Response Chart
Pickup Patterns Pads & Filters
Omnidirectional (25 - 20,000 Hz)
Cardioid (25 - 20,000 Hz)
Bidirectional (25 - 20,000 Hz)
  • Filter: HPF @ 100Hz (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 27mm
Weight Length Max Diameter Interface(s)
745g (26.28oz) 205mm (8.07'') 60mm (2.36'')
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48v

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