Audio-Technica Unveils the U851RO Omnidirectional Condenser Boundary Microphone
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Audio-Technica brings to market the new U851RO Omnidirectional Condenser Boundary Microphone. Featuring breakthrough audio and mechanical design innovations, the phantom-powered U851RO offers outstanding speech intelligibility and transparent sound quality for surface-mount applications. Such applications include high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations.
The U851RO’s small-diameter UniPoint® capsule near the boundary eliminates phase distortion and delivers clear, high-output performance. The unit is equipped with a PivotPoint® rotating output connector, allowing the cable to exit from either the rear or the bottom of the microphone; a UniSteep® filter, which provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality; and UniGuard® RFI-shielding technology, which offers outstanding rejection of radio frequency interference. Self-contained electronics eliminate the need for an external power module. It accepts interchangeable condenser elements in cardioid and hypercardioid polar patterns.
The U851RO features a low-profile design with a low-reflectance black finish for minimum visibility, in addition to a heavy die-cast case and silicon foam bottom pads to help minimize coupling of surface vibration to the microphone. The U851RO’s low-profile element provides a uniform omnidirectional polar pattern with a 360-degree acceptance angle.
U851RO Specifications:
| Element | Fixed-charge back plate, permanently polarized condenser |
| Polar Pattern | Omnidirectional in hemisphere above mounting surface |
| Frequency Response | 30-20,000 Hz |
| Low Frequency Roll-Off | 80 Hz, 18 dB/octave |
| Open Circuit Sensitivity | -31 dB (28.2 mV) re 1V at 1 Pa |
| Impedance | 200 ohms |
| Maximum Input Sound Level | 132 dB SPL, 1 kHz at 1\% T.H.D. |
| Dynamic Range (typical) | 111 dB, 1 kHz at Max SPL |
| Signal-to-Noise Ratio | 73 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) maximum length, |
| Output Connector | TB3M-type |
| Cable | 25' (7.6 m) long, 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F-type and XLRM-type connectors |
| Optional Interchangeable Elements | UE-C cardioid (120°); UE-H hypercardioid (100°) |
| Accessory Furnished | Soft protective pouch |
The U851RO Omnidirectional Condenser Boundary Microphone is currently available with a U.S. MSRP of $313.00. For more information, please visit
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