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Information

The Audio Technica U851A is a Cardioid Condenser Boundary Microphone. Designed for surface-mount applications such as high-quality sound reinforcement, professional recording.

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.

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
  • Specifications

  • 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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