Cardioid Condenser Boundary Microphone
The white-finished version of the U851R, the phantom-powered U851RW features a PivotPoint® rotating output connector, UniSteep® filter and UniGuard® RFI-shielding technology. Offering outstanding speech intelligibility and transparent sound quality for surface-mount applications, the U851RW accepts interchangeable condenser elements – available for boundary microphones in cardioid, hypercardioid and omnidirectional polar patterns. With a heavy die-cast case and silicon foam bottom pads to minimize coupling of surface vibration to the microphone, the U851RW is equipped with self-contained electronics, eliminating the need for an external power module.
| Element | Fixed-charge back plate, permanently polarized condenser |
| Polar Pattern | Half-cardioid |
| Frequency Response | 30-20,000 Hz |
| Low Frequency Roll-Off | 80 Hz, 18 dB/octave |
| Open Circuit Sensitivity | –34 dB (19.9 mV) re 1V at 1 Pa |
| Impedance | 200 ohms |
| Maximum Input Sound Level | 134 dB SPL, 1 kHz at 1% T.H.D. |
| Dynamic Range (Typical) | 108 dB, 1 kHz at Max SPL |
| Signal-To-Noise Ratio | 68 dB, 1 kHz at 1 Pa |
| Phantom Power Requirements | 11-52V DC, 4 mA typical |
| Switch | Flat, roll-off |
| Weight | 9.2 oz (262 g) |
| Dimensions | 4.25″ (108.0 mm) long, |
| Output Connector | TB3M-type |
| Cable | 25.0′ (7.6 m) long, 0.13″ (3.2 mm) diameter, 2-conductor, shielded cable with TA3F and XLRM-type connectors |
| Optional Interchangeable Elements | UE-H hypercardioid (100°); |
| Accessories Furnished | Soft protective pouch |
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