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Shure Shure

Shure RPM181/C Cardioid Capsule for BETA 181 Microphone

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Overview

A cardioid capsule for the versatile Shure 181 mic.

The Shure BETA 181/C is a cardioid capsule for the versatile Shure BETA 181 microphone. The RPM181/C is ideal for drum overhead, piano, acoustic instruments, and M/S stereo recording (paired with the Shure BETA 181/BI)

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 is the Cardioid (RPM181/C) version. There are also Supercardioid (RPM181/S), Bidirectional (RPM181/BI) and Omnidirectional (RPM181/O) versions (additional capsules sold separately). This makes the BETA 181 an extremely versatile and cost-effective mic that allows the user to interchange capsules according to the application.

Features

  • A cardioid capsule for the Shure BETA 181 mic
  • Ideal for drum overhead, piano, acoustic instruments and M/S stereo recording

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Specs

RPM181/C Cardioid Capsule for BETA 181 Microphone Specifications:

Cartridge Type
  • Electret Condenser
Polar Pattern
  • Cardioid
Frequency Response
  • 20 to 20,000Hz
Output Impedance
  • 110 ohm
Sensitivity (open circuit voltage, @ 1kHz, typical
  • 46.5dBV/Pa (2.4 mV)
Maximum SPL (1kHz at 1% THD)
  • 2,500 ohm load: 151.5dB SPL
1,000 ohm load: 149dB SPL
Signal-to-Noise Ratio
  • 73.5dB
Dynamic Range
  • 2,500 ohm load: 131dB
1,000 ohm load: 128.5dB
Clipping Level @ 1 kHz, 1% THD
  • 2,500 ohm load: 10.5 dBV
1,000 ohm load: 7.5 dBV
Self Noise (equivalent SPL, A-weighted, typical)
  • 20.5dB SPL-A
Common Mode Rejection (20 to 20,000Hz)
  • ±55dB
Polarity
  • Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Power Requirements
  • 11.52 VDC phantom power (IEC-61938): 2.4 mA, maximum
Capsule Width
  • 1.36" (34.54 mm)
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