Offering outstanding Audio-Technica sound for surface-mount applications, the U851A features a PivotPoint® rotating output connector, UniSteep® filter and UniGuard® RFI-shielding technology. This battery- or phantom-powered condenser boundary microphone has a cardioid pattern.
Its heavy die-cast case and silicon foam bottom pads minimize coupling of surface vibration to the microphone. With superior off-axis rejection and maximum gain-before-feedback, this professional microphone sets audio-quality standards in challenging acoustic environments.
Features:
Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
PivotPoint® rotating output connector allows cable to exit from either the rear or the bottom of the microphone
Superior off-axis rejection for maximum gain before feedback
UniGuard® RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
UniSteep® filter provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality
Small-diameter UniPoint capsule near boundary eliminates phase distortion and delivers clear, high-output performance
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 black finish for minimum visibility
Operates on battery or phantom power
| Manufacturer Part # | U851A |
|---|---|
| Rental Includes | U851A Cardioid Condenser Boundary Microphone with attached 25' cable & pouch. |
| ELEMENT | Fixed-charge back plate, permanently polarized condenser |
| POLAR PATTERN | Half-cardioid (cardioid in hemisphere above mounting surface) |
| FREQUENCY RESPONSE | 30-20,000 Hz |
| LOW FREQUENCY ROLL-OFF | 80 Hz, 18 dB/octave |
| OPEN CIRCUIT SENSITIVITY | Phantom: –40 dB (10.0 mV) re 1V at 1 Pa Battery: –41 dB (8.9 mV) re 1V at 1 Pa |
| IMPEDANCE | Phantom: 200 ohms Battery: 270 ohms |
| MAXIMUM INPUT SOUND LEVEL | Phantom: 133 dB SPL, 1 kHz at 1% T.H.D. Battery: 123 dB SPL, 1 kHz at 1% T.H.D. |
| DYNAMIC RANGE (typical) | Phantom: 111 dB,1 kHz at Max SPL Battery: 101 dB, 1 kHz at Max SPL |
| SIGNAL-TO-NOISE RATIO | 72 dB, 1 kHz at 1 Pa |
| PHANTOM POWER REQUIREMENTS | 11-52V DC, 2 mA typical |
| BATTERY TYPE | 1.5V AA/UM3 |
| BATTERY CURRENT / LIFE | 0.4 mA / 1200 hours typical (alkaline) |
| SWITCH | Off, on-flat, on-roll-off |
| WEIGHT (MICROPHONE) | 8.6 oz (244 g) |
| WEIGHT (POWER MODULE) | 4.9 oz (139 g) |
| DIMENSIONS (MICROPHONE) | 4.25" (108.0 mm) long, 3.31" (84.0 mm) maximum width, 0.91" (23.0 mm) height |
| DIMENSIONS (POWER MODULE) | 3.31" (84.0 mm) H x 2.48" (63.0 mm) W x 0.87" (22.0 mm) D |
| OUTPUT CONNECTOR (POWER MODULE) | Integral 3-pin XLRM-type |
| CABLE | 25.0' (7.6 m) long (permanently attached to microphone), 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F-type connector |
| OPTIONAL INTERCHANGEABLE ELEMENTS | UE-H hypercardioid (100°); UE-O omnidirectional (360°) |
| ACCESSORIES FURNISHED | AT8531 power module; battery; soft protective pouch |
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