Shure B181 Condenser Microphone with Changeable Capsule

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Shure B181 Condenser Microphone with Changeable Capsule

This 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.) A total of four different capsules (Cardioid, Supercardioid, Bi-directional, Omni-directional) are available, allowing you to interchange them according to application.


  • Interchangeable polar pattern capsules attach to a compact preamplifier with integrated XLR connections
  • Precision-engineered, compact side-address design features innovative locking ring to provide secure connection between capsule and preamplifier
  • Frequency response tailored for wide dynamic range applications for use in high SPL environments


  • Cartridge Type: Electret Condenser
  • Polar Pattern: Cardioid / Supercardioid / Omnidirectional / Bidirectional
  • Frequency Response: 20 to 20,000 Hz
  • Output Impedance: 110 Ω
  • Maximum SPL (1 kHz at 1% THD, 1kΩ load):
    • Cardioid: 149.0 dB SPL
    • Supercardoid: 152.0 dB SPL
    • Omnidirectional 154.0 dB SPL
    • Bidirectional 153.5 dB SPL
  • Signal-to-Noise Ratio(referenced at 94 dB SPL at 1 kHz;S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted):
    • Cardioid: 73.5 dB
    • Supercardoid: 72.5 dB
    • Omnidirectional 70.5 dB
    • Bidirectional 71.0 dB
  • Dynamic Range (at 1 kHz, 1 kΩ load):
    • Cardioid: 128.5 dB
    • Supercardoid: 129.5 dB
    • Omnidirectional 130.5 dB
    • Bidirectional 130.5 dB
  • Clipping Level (1 kHz at 0.25% THD, 1kΩ load): 7.5 dBV (2.4 V)
  • Self-Noise (equivalent SPL, A-weighted, typical):
    • Cardioid: 20.5 dB
    • Supercardoid: 22.5 dB
    • Omnidirectional 23.5 dB
    • Bidirectional 23.0 dB
  • Common Mode Rejection (20–20,000 Hz): ≥55 dB
  • 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), 1.2 mA
  • Weight: Net-145 g (5.1 oz.)


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