Crown MB3
Mini-Boundary Microphone, Half-Supercardioid

The Crown MB3 is a miniature boundary microphone for multi-miking applications such as teleconferencing, distance learning, boardrooms, courtrooms, and security applications. This low-profile, circular mic permanently installs into a hole drilled in a table, lectern, or ceiling.

Thanks to its supercardioid pickup pattern, the MB3 greatly reduces ambient noise and pickup of room reverberation. The result is a clearer, more intelligible sound.

On the bottom of the mic is a tubular power module with a 3-pin XLR-type output connector. It is powered by 12-48V phantom power, and has a low-impedance balanced mic-level output.

Features

• Ideal for teleconferencing, distance learning, boardrooms, courtrooms and security
• Small and inconspicuous
• Installs permanently in a table top, wall or ceiling
• Half-supercardioid polar pattern reduces pickup of background noise, room acoustics and feedback
• On-surface mounting eliminates phase interference from table sound reflections, giving a natural sound

Specifications

• Element: Electret condenser
• Frequency Response (typical): 50 Hz to 15,000 Hz at 30 degrees incidence to surface
• Polar Pattern: Half-supercardioid (supercardioid in the hemisphere above the primary boundary)
• Impedance: 150 ohms balanced
• Recommended Load Impedance: 1000 ohms
• Open-circuit sensitivity: 22 mV/Pa (-33 dB re 1V/Pa)
• Power Sensitivity: -30.5 dB re 1 mW/Pa; EIA rating -125 dBm
• Equivalent noise level (self noise): 22 dB SPL typical, A-weighted
• S/N Ratio: 72 dB at 94 dB SPL
• Max SPL for 3% THD: 120 dB
• Operating Voltage: 12 to 48V DC phantom power, positive on pins 2 and 3 with respect to pin 1 output connector
• Output connector: 3-pin pro audio, XLR-M type
• Cable: None supplied. Use two-conductor shielded mic cable
• Current Drain: 4 mA nominal
• Materials: High-impact molded plastic and steel mesh mic grille, steel chassis
• Finish: Satin black
• Dimensions (Height x Max Diameter): 3.324" x .974"
• Weight: 2.7 oz