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Home > Pro Audio > Microphones & Wireless Systems > Microphones > Microphone Accessories > Microphone Capsules > Shure RPM181/BI Bidirectional Capsule for Beta 181

Microphone Accessories

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Item #: H70023

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Price: $249.00
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Product Overview

A bidirectional capsule for the versatile Shure 181 mic.

  • A bidirectional capsule for the Shure Beta 181 mic
    Ideal for mono drum overheads, and dual instrument sound source applications
Product Details

Shure RPM181/BI Bidirectional Capsule for Beta 181

The Shure RPM181/BI is a bi-directional condenser capsule for the versatile Shure Beta 181 microphone. The Beta 181/BI capsule is ideal for mono drum overheads, and dual instrument sound source 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: Cardioid (RPM181/C), Supercardioid (RPM181/S), Bi-directional (RPM181/BI), Omni-directional (RPM181/O). 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).

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  • Cartridge Type: Electret Condenser
    Polar Pattern: Bidirectional
    Frequency Response: 20 to 20,000 Hz
    Output Impedance: 110 O
    Sensitivity (open circuit voltage, @ 1 kHz, typical: –51.0 dBV/Pa (2.6 mV)
    Maximum SPL (1 kHz at 1% THD)
    2500 O load: 156.0 dB SPL
    1000 O load: 153.5 dB SPL dB SPL

    Signal-to-Noise Ratio: 71.0 dB
    Dynamic Range:
    2500 O load: 133.0 dB dB
    1000 O load: 130.5 dB

    Clipping Level @ 1 kHz, 1% THD:
    2500 O load: 10.5 dBV
    1000 O load: 7.5 dBV

    Self Noise (equivalent SPL,A-weighted, typical): 22.5 dB SPL-A
    Common Mode Rejection (20 to 20,000 kHz): ±55 dB
    Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
    Power Requirements 11–52 V DC phantom power (IEC-61938): 2.4 mA, maximum
    Capsule width: 1.36" (34.54mm)
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