Beyerdynamic Classis RM 31 SP
Revoluto Vertical Array Microphone with 3-Pin XLRM in Black


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Part of the Classis RM 31 series, Beyerdynamic's Classis RM 31 SP is a desktop microphone that's made for applications like round table discussions, podiums, tele/video conferencing, announcements, and lecterns. It's designed with Revoluto technology offering 5 integrated microphone capsules and offers a "corridor"-type pickup characteristic that ensures a wide range of good voice quality. Within this range, up to two speakers can move about freely, i.e. they can stand up or sit down, move their head and move towards or away from the microphone. The microphone comes with innovative Scudio technology, making it absolutely insensitive to wireless communication devices such as mobile phones. The SP model's specific features include: 3-pin male XLR connector, phantom power adapter, programmable button (PTT, PTM, ON/OFF) with braille, switchable low-cut filter, switchable LED ring. 

Via its programmable button, the Classis RM 31 SP allows you to select between the operating modes: ON/OFF, Push-To-Talk, and Push-To-Mute. The button can also be disabled. Using a separate switch, the frequency response can be set in 2 stages: Linear or with low-cut filter to suppress low-frequency interference. Additionally, the illuminated ring that indicates the mic status can be deactivated. This LED ring displays the ready-to-talk status of the microphone.

Beyerdynamic Classis RM 31 SP Features:

  • Horizontal corridor characteristic for picking up two speakers
  • Large speaking distance
  • Large freedom of movement
  • Revoluto technology with vertical microphone array
  • RFI-proof due to Scudio technology
  • High gain before feedback
  • Modern metal housing
  • Quality crafted in Germany

Beyerdynamic Classis RM 31 SP Features:


  • Microphone: Revoluto microphone array, patented
  • Transducer type: Electret condenser
  • Operating principle: Pressure gradient
  • Polar pattern: Corridor
  • Horizontal: Cardioid
  • Vertical: Lobar
  • Optimal distance to the speaker: 40 - 80 cm [15.75" - 31.5"]
  • Frequency response: 90 - 20.000 Hz
  • Sensitivity: 28.5 mV/Pa = -30.9dBV ±2dB
  • Nominal impedance: < 200 Ohms
  • Load impedance: = 1 kOhms
  • Signal-to-noise ratio / noise voltage: 67.2 dB [A] / 12.5 µV [A]
  • Max. SPL: 107 dB [SPL @ 1% THD]
  • Equivalent SPL: 26.8 dB [A]
  • Connector: balanced, with 3-pin male XLR connector
  • Supply voltage / supply current:
    • Phantom power:
      • P48 (+48 VDC ±4 VDC, 6.8 kOhms ±20%, < 9.5 mA)
      • P24 (+24 VDC ±4 VDC, 1.2 kOhms ±20%, < 9.5 mA)
      • P12 (+12 VDC ±1 VDC, 680 Ohms ±20%, < 9.5 mA)


  • Operating Temperature range: 14° F to 104° F (-10° C to +40° C)


  • Housing color: Black
  • Length: 11.81"" (300mm)
  • Capsule: 0.98" (25mm)
  • Weight: 0.41 lbs (186 g)
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