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Shure RPM181/PRE Replacement XLR Preamplifier for Beta 181 Microphone

SKU: SHRPM181PR MFR: RPM181/PRE
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Key Features

  • Enhance your Beta 181 mic with this Shure XLR preamplifier for top sound quality.
  • Achieve pristine audio: Replacement preamplifier ensures your microphone performs its best.
  • Multiple polar patterns supported: Cardioid, Supercardioid, Omni, and Bidirectional.
  • Get optimal signal clarity with a high signal-to-noise ratio for clear recordings.
  • Phantom power compatible: Operates efficiently with 11-52V DC phantom power.
  • Durable and reliable: Built to Shure's high standards for long-lasting performance.
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Special Order Item?Estimated to Ship: 08/14/2025
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Shure RPM181/PRE Specifications

  • Compatibility

    Shure Beta 181 Microphone

  • Frequency Response

    20 to 20,000 Hz

  • Polar Pattern

    181/C: Cardioid
    181/S: Supercardioid
    181/O: Omnidirectional
    181/BI: Bidirectional

  • Sensitivity

    Cardioid: -46.5 dBV/Pa[1] (2.4 mV)
    Supercardioid: -49.5 dBV/Pa[1] (2.5 mV)
    Omnidirectional: -52.0 dBV/Pa[1] (2.6 mV)
    Bidirectional: -51.0 dBV/Pa[1] (2.6 mV)

  • Output Impedance

    110 ohms (at 1 kHz)

  • Signal to Noise Ratio

    Cardioid: 73.5 dB
    Supercardioid: 71.5 dB
    Omnidirectional: 70.5 dB
    Bidirectional: 71.0 dB

  • Self Noise

    Cardioid: 20.5 dB SPL-A
    Supercardioid: 22.5 dB SPL-A
    Omnidirectional: 23.5 dB SPL-A
    Bidirectional: 23.0 dB SPL-A

  • Common Mode Rejection

    = 55 dB

  • Polarity

    Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3

  • Power Requirements

    11-52 V DC[4] phantom power (IEC-61938) 2.4 mA, maximum

  • Maximum SPL: 1000 Ohm Load

    Cardioid: 149.0 dB SPL
    Supercardioid: 152.0 dB SPL
    Omnidirectional: 154.0 dB SPL
    Bidirectional: 153.5 dB SPL

  • Maximum SPL: 2500 Ohm Load

    Cardioid: 151.5 dB SPL
    Supercardioid: 154.5 dB SPL
    Omnidirectional: 157.0 dB SPL
    Bidirectional: 156.0 dB SPL

  • Dynamic Range: 1000 Ohm Load

    Cardioid: 128.5 dB
    Supercardioid: 129.5 dB
    Omnidirectional: 130.5 dB
    Bidirectional: 130.5 dB

  • Dynamic Range: 2500 Ohm Load

    Cardioid: 131.0 dB
    Supercardioid: 132.0 dB
    Omnidirectional: 133.5 dB
    Bidirectional: 133.0 dB

  • Clipping Level

    1000 Ohm Load: 7.5 dBV
    2500 Ohm Load: 10.5 dBV

  • Weight

    5.1 oz (144.5 g)

  • UPC Code

    042406187923

3 Accessories for Shure RPM181/PRE Replacement XLR Preamplifier for Beta 181 Microphone

  • All Accessories (3)
  • Covers & Caps (3)Required Item

Designed For Use With:

  • Beta 181 Microphone

Need Help?

For any questions about compatibility with this product, call us at 800-223-2500 or you can email us any time.

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Accessory TypeMicrophone BodyMicrophone BodyMicrophone Body

About Shure RPM181/PRE

From the renowned brand Shure, the RPM181/PRE Replacement XLR Preamplifier is a high-quality, professional-grade component specifically engineered for the Shure Beta 181 side-address instrument microphone. This innovative and reliable preamplifier is designed to seamlessly integrate with one of four interchangeable capsules, offering cardioid, supercardioid, omnidirectional, and bidirectional polar patterns. This versatility makes it an ideal choice for a wide range of audio applications.

Despite its lightweight design, weighing in at only 5.1 oz, this durable preamplifier is capable of getting close to any sound source, even in the most confined conditions. It boasts a wide frequency response and high SPL handling, making it perfect for miking dual sound sources such as between toms or acoustic instruments.

The RPM181/PRE Replacement XLR Preamplifier is not only useful as a mono drum overhead but can also be paired with another to create the Blumlein stereo effect. When matched with any of the available capsules, it performs with minimal crossover distortion and provides exceptional low-frequency reproduction.

This combination delivers outstanding audio quality with consistent, textbook-like polar responses. The result is a microphone setup with remarkable sound and versatility, making it a must-have for live performances, recording studios, and other professional audio applications. Trust in the Shure RPM181/PRE Replacement XLR Preamplifier for your Beta 181 Microphone to deliver the superior audio performance you need.

Shure RPM181/PRE Features

  • Works with one of four interchangeable capsules for the Shure Beta 181 instrument microphone
  • The cardioid, supercardioid, omnidirectional and bidirectional capsules make this mic highly versatile
  • Weighs only 5.1 oz with attached capsule and captures any source even in the tightest conditions
  • Matched with any available capsule it performs with little to no crossover distortion and provides exceptional low-frequency reproduction

Warranty Information

This product has a limited warranty of 24 months.

Key Features

  • Enhance your Beta 181 mic with this Shure XLR preamplifier for top sound quality.
  • Achieve pristine audio: Replacement preamplifier ensures your microphone performs its best.
  • Multiple polar patterns supported: Cardioid, Supercardioid, Omni, and Bidirectional.
  • Get optimal signal clarity with a high signal-to-noise ratio for clear recordings.
  • Phantom power compatible: Operates efficiently with 11-52V DC phantom power.
  • Durable and reliable: Built to Shure's high standards for long-lasting performance.