Audio Technica U851Rb Cardioid Condenser Boundary Microphone
The phantom-powered U851Rb cardioid 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, available separately in 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 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.
- Cardioid condenser boundary microphone
- 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
- Available in two colors: black (U851Rb) and white (U851RWb)
| ELEMENT | Fixed-charge back plate, permanently polarized condenser |
| POLAR PATTERN | Cardioid |
| FREQUENCY RESPONSE | 20-20,000 Hz |
| LOW FREQUENCY ROLL-OFF | 80 Hz, 18 dB/octave |
| OPEN CIRCUIT SENSITIVITY | -34 dB (19.9 mV) re 1V at 1 Pa |
| IMPEDANCE | 50 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, A-weighted |
| PHANTOM POWER REQUIREMENTS | 11-52V DC, 4.4 mA |
| SWITCH | Flat, roll-off |
| WEIGHT | 253 g (8.9 oz) |
| DIMENSIONS | 0.91" (23.0 mm) H x 3.30" (83.9 mm) W x 4.25" (108.0 mm) D |
| OUTPUT CONNECTOR | Microphone: TB3M-type
Cable: 3-pin XLRM-type |
| CABLE | 25.0 (7.6 m) long, 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F and XLRM connectors |
| OPTIONAL INTERCHANGEABLE ELEMENTS | UE-H hypercardioid (100°)
UE-O omnidirectional (360°) |
| ACCESSORY FURNISHED | Soft protective pouch |
