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Shure

collapse expand iconDescription

The Shure RPM181/O is an omnidirectional condenser capsule for the versatile Shure BETA 181 microphone. The RPM181/O l capsule is ideal for use for ambient recordings or for instrument ensemble applications.

The Shure BETA 181 (sold separately) is a multipurpose instrument microphone and can be used on a wide variety of applications including guitars, bass and drums (overheads and snares). It has a small-diaphragm design that provides superior audio with textbook polar responses in a form factor compact enough to get close to the source in the tightest conditions.

There are four different capsules available for the BETA 181 microphone: this Omnidirectional (RPM181/O) one, as well as a Cardioid (RPM181/C), Supercardioid (RPM181/S) and Bidirectional (RPM181/BI). This makes the BETA 181 an extremely versatile and cost-effective mic that allows the user to interchange capsules according to the application. (Additional capsules sold separately).

Shure RPM181/O Omnidirectional Capsule for BETA 181

collapse expand iconFeatures

  • An omnidirectional capsule for the Shure BETA 181 mic
  • Ideal for use for ambient recordings or for instrument ensemble applications

collapse expand iconSpecs

Cartridge Type
  • Electret Condenser
Polar Pattern
  • Omnidirectional
Frequency Response
  • 20Hz to 20kHz
Output Impedance
  • 110 ohm
Sensitivity (open circuit voltage, @ 1 kHz, typical)
  • -52.0 dBV/Pa (2.6 mV)
Maximum SPL (1kHz at 1% THD)
  • 2,500 ohm load: 157dB SPL
1,000 ohm load: 154dB SPL
Signal-to-Noise Ratio
  • 70.5dB
Dynamic Range
  • 2,500 ohm load: 133.5dB
1,000 ohm load: 130.5dB
Clipping Level @ 1kHz, 1% THD
  • 2,500 ohm load: 10.5dBV
1,000 ohm load: 7.5dBV
Self Noise (equivalent SPL, A-weighted, typical)
  • 23.5dB SPL-A
Common Mode Rejection (20Hz to 20kHz)
  • ±55dB
Polarity
  • Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Power Requirement
  • 11-52 V DC phantom power (IEC-61938): 2.4 mA, maximum
Capsule Width
  • 1.36" (34.54 mm)

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