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Shure

collapse expand iconDescription

The Shure BETA 181/O instrument mic is a Shure BETA RPM181/Pre preamp fitted with a Shure RPM181/O omnidirectional capsule. The RPM181/O capsule is ideal for use for ambient recordings or for instrument ensemble applications.

The Shure BETA 181 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. The BETA 181 has a precision-engineered, side-address design that features an innovative locking ring to provide secure connection between capsule and preamplifier with integrated XLR connections.

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). It comes with mic clip, zippered carrying case and windscreen.

This microphone requires phantom power and performs best with a 48 VDC supply (IEC-61938). However, it will operate with slightly decreased headroom and sensitivity with supplies as low as 11 VDC.
Shure BETA 181/O Instrument Mic
Shure BETA 181/O Instrument Mic
Shure BETA 181/O Instrument Mic

collapse expand iconFeatures

  • Premier live performance microphone with Shure quality, ruggedness and reliability
  • Small-diaphragm design provides superior audio with textbook polar responses
  • The RPM181/O capsule is ideal for use for ambient recordings or for instrument ensemble applications
  • Side-address form allows for discreet positioning in tight performance and recording settings
  • Frequency response tailored for wide dynamic range for use in high SPL environments
  • Compact preamp attaches to four interchangeable capsules for custom flexibility (capsules sold separately)
  • Innovative locking ring provides a secure connection between capsule and preamp
  • Hardened steel mesh grille resists denting, wear, and abuse
  • Compact design, under 12 cm (5"), reduces stage clutter
  • Furnished with stand adapter and carrying case

collapse expand iconSpecs

  • Cartridge Type: Electret Condenser
  • Polar Pattern: Omnidirectional
  • Frequency Response: 20 to 20,000 Hz
  • Output Impedance: 110 Î
  • Sensitivity (open circuit voltage, @ 1 kHz, typical: -52.0 dBV/Pa (2.6 mV)
  • Maximum SPL (1 kHz at 1% THD)
    2500 Î load: 157.0 dB SPL
    1000 Î load: 154.0 dB SPL
  • Signal-to-Noise Ratio: 70.5 dB
  • Dynamic Range:
    2500 Î load: 133.5 dB
    1000 Î load: 130.5 dB
  • Clipping Level @ 1 kHz, 1% THD:
    2500 Î load: 10.5 dBV
    1000 Î load: 7.5 dBV
  • Self Noise (equivalent SPL,A-weighted, typical): 23.5 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
  • Net Weight 145 g (5.1 oz.)
  • Mic dimensions (Length x Diameter):
  • 4.40 in. x .80 in., (124.46 x 20.32mm)
  • Capsule width: 1.36" (34.54mm)

collapse expand iconWarranty

One year warranty on wireless mics, mixers, and circuitry products.
2 year warranty on wired mics.
Warranty terms vary. Check with manufacturer for specific product warranty.

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  • submitted5 years ago

    asked byJimmy

    fromFort Worth, Texas

    Is this microphone good for vocals?

    Is this microphone good for vocals?

    Open Reply - Beau
    This instrument mic would work but would not be a good choice to use for vocals.

  • submitted6 years ago

    asked byScott

    fromChicago, Il

    Hello, I'm looking to purchase Beta 181 and Beta 91. It looks like there are different types. I see Beta181 O and Beta 181 C, etc. I'm going to be putting these two mic's in a grand piano for a church sanctuary. I want to make sure that I get the correct mic's. Please advise which mic's and mounts that would be the best to do this. Thank you for your help.

    Hello, I'm looking to purchase Beta 181 and Beta 91. It looks like there are different types. I see Beta181 O and Beta 181 C, etc. I'm going to be putting these two mic's in a grand piano for a church sanctuary. I want to make sure that I get the correct mic's. Please advise which mic's and mounts that would be the best to do this. Thank you for your help.

    Open Reply - Ronald
    The O is an omnidirectional capsule, where the C is a cardioid capsule