Shure | RPM181/BI - Capsule for Beta 181, bi-directional

Shure - RPM181/BI

The Shure RPM181/BI is a bi-directional condenser capsule for the 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 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.

• Cartridge Type: Electret Condenser
• Polar Pattern: Bidirectional
• Frequency Response: 20 to 20,000 Hz
• Output Impedance: 110 Ω
• Sensitivity (open circuit voltage, @ 1 kHz, typical: -51.0 dBV/Pa (2.6 mV)
• Maximum SPL (1 kHz at 1% THD) 2500 Ω load: 156.0 dB SPL 1000 Ω load: 153.5 dB SPL dB SPL
• Signal-to-Noise Ratio: 71.0 dB
• Dynamic Range: 2500 Ω load: 133.0 dB dB 1000 Ω load: 130.5 dB
• Clipping Level @ 1 kHz, 1% THD: 2500 Ω load: 10.5 dBV1000 Ω 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)