Audio-Technica U851Rb Cardioid Condenser Boundary Microphone

The U851Rb from Audio-Technica is a cardioid condenser boundary microphone that features transparent sound quality with outstanding speech intelligibility, and blends right into demanding sound pickup situations. Ideal for use in a range of professional settings, it's surface-mountable and phantom-powered. It provides quality sound capture with its sophisticated UniSteep® filter for reduced pickup of low-frequency (LF) ambient noise. Additionally, it includes UniGuard® for protection from radio frequency interference (RFI), plus a PivotPoint® rotating connector for easy cable management with no tools required. Durable and discreet, its die-case case houses self-contained electronics which eliminate the need for an external power module — all within a low-profile design. It also comes with silicon foam bottom pads to minimize surface vibration-to-microphone coupling, as well as threaded inserts which enable optional screw-mounting for added security.

It comes in your choice of Black (U851Rb) or White (U851RWb).

Applications

Ideal for surface-mount applications in:

High-quality sound reinforcement • Professional recording • Television • Conferencing • Other demanding sound pickup situations

Includes

• U851Rb Black microphone:
  • Black 24.9' (7.6m) microphone cable (TA3F, XLRM) • Pouch
• U851RWb White microphone:
  • White 24.9' (7.6m) microphone cable (TA3F, XLRM) • Pouch

Features

• Cardioid condenser boundary microphone
• Superior off-axis rejection for maximum gain before feedback
• PivotPoint rotating output connector allows cable to exit from either the rear or the bottom of the microphone
• UniGuard RFI-shielding technology offers rejection of radio frequency interference
• Low-profile design with low-reflectance finish for minimum visibility
• Interchangeable microphone elements (additional elements sold separately) enable switching between polar pickup patterns

Specifications

• Element: Fixed-charge back plate, permanently polarized condenser
• Polar pattern: Cardioid (via the included interchangeable 120° UE-C mic element)
• Frequency response: 20 Hz to 20,000 Hz
• Low frequency rolloff: 80 Hz, 18 dB/octave
• Open circuit sensitivity: -34 dB (19.9 mV) (0 dB=1 V/Pa, 1 kHz)
• Impedance: 50 Ω
• Maximum input sound level: 134 dB SPL (sound pressure level), note: 1 kHz at 1% THD
• Noise: 26 dB SPL (A-weighted)
• Dynamic range: 108 dB (1 kHz at Maximum SPL)
• Signal-to-noise ratio: 68 dB (1 kHz at 1 Pa, A-weighted)
• Phantom power requirements: 11 - 52 VDC, 4.4 mA
• Switches: Low-cut, on/off
• Weight: 8.9 oz. (253 g)
• Dimensions (H × W × D): 0.91" x 3.3" x 4.25" (23 × 83.9 × 108mm)
• Output connector:
  • Microphone: TB3M-type
  • Cable: Male XLR3-type
• Optional interchangeable microphone elements (sold separately):
  • UE-O omnidirectional (360°)
  • UE-H hypercardioid (100°)
• Note: further information can be found within the items located under the "Documentation" tab above.