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.
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|
U851A Cardioid Condenser Boundary Microphone with attached 25' cable & pouch.
|ELEMENT||Fixed-charge back plate, permanently polarized condenser|
(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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