U851A

This product has been discontinued. Please see our other options for Boundary Microphones. 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 microphone accepts interchangeable condenser elements—available for boundary microphones in cardioid, hypercardioid and omnidirectional polar patterns. 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.

Microphone
Element	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
Maximum Input Sound Level	Phantom: 133 dB, 1 kHz at 1% T.H.D. - Battery: 123 dB, 1 kHz at 1% T.H.D.
Dynamic Range	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)
Switches	Off, on-flat, on-roll-off
Weight	8.6 oz (244 g)
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
Dimensions	4.25" (108.0 mm) long, 3.31" (84.0 mm) maximum width, 0.91" (23.0 mm) height
Output Connector	3-pin XLRM-type
Accessories Included	AT8531 power module; battery; soft protective pouch