The phantom-powered U851Rb condenser boundary microphone offers outstanding speech intelligibility and transparent sound quality for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing, and other demanding sound pickup situations. The microphone is equipped with a PivotPoint® rotating output connector, UniSteep® filter, and UniGuard® RFI-shielding technology. It accepts interchangeable condenser elements – omnidirectional (360°), cardioid (120°), and hypercardioid (100°) – available separately. With a heavy die-cast case and silicon foam bottom pads to minimize coupling of surface vibration to the microphone, the U851Rb is equipped with self-contained electronics, eliminating the need for an external power module. Threaded inserts on the bottom of the microphone allow it to be mounted with screws for increased security.
Available configurations:
U851Rb: cardioid polar pattern (120° acceptance angle); 25.0' (7.6 m) cable with TA3F connector at the microphone and XLRM output connector; black finish.
U851RWb: cardioid polar pattern (120° acceptance angle); 25.0' (7.6 m) cable with TA3F connector at the microphone and XLRM output connector; white finish.
U851RbO: omnidirectional polar pattern (360° acceptance angle); 25.0' (7.6 m) cable with TA3F connector at the microphone and XLRM output connector; black finish.
- Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
- 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
- Small-diameter UniPoint® element near boundary eliminates phase distortion and delivers clear, high-output performance
- Available interchangeable elements permit angle of acceptance from 100° to 360°
- UniGuard® RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
- Self-contained electronics eliminate need for external power module
- Heavy die-cast case and non-slip silicone foam bottom pads minimize coupling of surface vibration to the microphone
- Low-profile design with low-reflectance finish for minimum visibility
- Threaded inserts on bottom of microphone allow it to be mounted with screws for increased security
| Microphones |
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| Element | Fixed-charge back plate, permanently polarized condenser |
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| Frequency Response | 20-20,000 Hz |
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| Low Frequency Roll Off | 80 Hz, 18 dB/octave |
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| Open Circuit Sensitivity | -34 dB (19.9 mV) re 1V at 1 Pa |
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| Maximum Input Sound Level | 134 dB SPL, 1 kHz at 1% T.H.D. |
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| Dynamic Range | 108 dB, 1 kHz at Max SPL |
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| Signal-to-Noise Ratio | 68 dB, 1 kHz at 1 Pa, A-weighted |
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| Phantom Power Requirements | 11-52V DC, 4.4 mA |
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| Switches | Flat, roll-off |
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| Weight | 253 g (8.9 oz) |
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| Cable | 25.0' (7.6 m) long, 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F and XLRM connectors |
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| Dimensions | 0.91" (23.0 mm) H x 3.30" (83.9 mm) W x 4.25" (108.0 mm) D |
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| Output Connector | Microphone: TB3M-type Cable: 3-pin XLRM-type |
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| Optional Interchangeable Elements | UE-C cardioid (120°), UE-H hypercardioid (100°), UE-O omnidirectional (360°) |
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| Accessories Included | Soft protective pouch |
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