The Shure Beta 181/BI Bidirectional Microphone is an ultra-compact, small-diaphragm side-address bidirectional condenser microphone, designed for discrete placement and control in live and studio environments.
The Shure Beta 181/BI Bidirectional Microphone is a versatile condenser instrument microphone with bi-directional polar pattern capsule. Featuring bidirectional capsule, the small diaphragm design provides superior audio with consistent, textbook polar responses in a form factor small enough to get close to the source in the tightest conditions. This 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). A total of four different capsules (Cardioid, Supercardioid, Bi-directional, Omni-directional) are available, allowing you to interchange them according to application.
Interchangable Capsule Options
The RPM181/C is a cardioid condenser capsule for the Shure Beta 181/C. The RPM181/S is a super cardioid condenser capsule for the Shure Beta 181/S. The RPM181/BI is a bi-directional condenser capsule for the Shure Beta 181/BI. The RPM181/O is a omni directional condenser capsule for the Shure Beta 181/O.
Applications for the Different Capsules
The cardioid capsule is best suited to overheads, piano and acoustic instruments. You can also use the cardioid capsule for M/S stereo micing (in conjunction with another microphone with a bi-directional capsule). The supercardioid capsule is best suited to snare, toms, acoustic instruments and other forms of close distance micing. The omni-directional capsule could be used for choirs, orchestras and ambient recording applications. Lastly, the Bi-directional capsule can be used for mono overheads, or for the recording of two instruments simultaneously on one channel.
Shure Beta 181/BI Bidirectional Microphone Features
- Bi-directional polar pattern capsule attaches 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
Shure Beta 181/BI Bidirectional Microphone Specifications
- Cartridge Type: Electret Condenser
- Polar Pattern: Bi-Directional
- Frequency Response: 20 to 20,000 Hz
- Output Impedance: 110 Ohm
- Sensitivity (Open Circuit Voltage, @ 1 kHz, Typical): –51.0 dBV/Pa (2.8 mV)
- Maximum SPL (1 kHz at 1% THD):
- 2500 Ohm Load: 156.0 dB SPL
- 1000 Ohm Load: 153.5 dB SPL
- Signal-to-Noise Ratio: 71.0 dB
- Dynamic Range:
- 2500 Ohm Load: 133.0 dB
- 1000 Ohm Load: 130.5 dB
- Clipping Level @ 1 kHz, 1% THD:
- 2500 Ohm Load: 10.5 dBV
- 1000 Ohm Load: 7.5 dBV
- Self Noise (Equivalent SPL, A-weighted, Typical): 23.0 dB SPL-A
- Common Mode Rejection (20 to 20,000 kH): = 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.)
Shure Beta 181/BI Bidirectional Microphone Includes
- 1 x Shure Beta 181/BI Bidirectional Microphone
- 1 x Shure A57F Mic Clip
- 1 x Shure A181C Zippered Carrying Case
- 1 x Shure A181WS Windscreen
- 2 Year Warranty
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