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Neumann AK 31 Microphone Capsule (Omnidirectional)

  • Product Highlights
  • Omnidirectional Polar Pattern
  • Modular Design
  • Use with KM100 & KM100F
No Longer Available
This item has either been discontinued by the manufacturer or is no longer available to purchase on our website.

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(800) 771-8330
  • Product Highlights
  • Omnidirectional Polar Pattern
  • Modular Design
  • Use with KM100 & KM100F

Omnidirectional, Direct Field Miniature Microphone Capsule Head


The Neumann AK 31 microphone capsule is part of the KM 100 miniature series microphone systems. The AK 31 features a pressure gradient, single diaphragm transducer with an omni-directional polar pattern.

The AK 31 produces a flat frequency response up to 20kHz. In the diffuse field the microphone has a high frequency roll-off above 5kHz. The microphone is best applied as a spot microphone for piano, wind instruments, strings, percussion and drums, room ambiance capturing or stereo recording.


  • Omnidirectional Pattern
    The pressure gradient element provides an omnidirectional pattern providing even frequency response and output levels.
  • Modular Design
    The capsule is developed for use with the KM100 and KM100F modular power supplies.


  • Transducer: Pressure Condenser
  • Polar Pattern: Omnidirectional
  • Frequency Response: 20 Hz - 20 kHz
  • Dynamic Range (Typical): 124 dB
  • Signal-to-Noise Ratio:
    69 dB, Related at 1 Pa at 1 kHz (CCIR dB)
    78 dB, Related at 1 Pa at 1 kHz (A-Weighted dB)
  • Maximum Input Sound Level:
    140 dB, Less than 0.5% THD (without Preattenuation)
    150 dB, Less than 0.5% THD (with Preattenuation)
  • Power Requirements: Phantom +48v (KM 100 Power Supply)
  • Output Impedance: 50 Ohms
  • Output Connectors: XLR-3 Type (KM 100 Power Supply)
  • Pad: Yes, -10 dB Preattenuation
  • Low Frequency Roll-Off: Use KM 100F Power Supply
  • Dimensions (LxDiameter): 3.68 x 0.88" (92 x 22mm)
  • Weight: 2.82 oz. (80 g)

Q & A

AK 31
MFR Part Number
Product Category
Microphone Accessories
Unit of Measure
Shipping Weight
0.50 lbs.
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