Audio-Technica U851A Cardioid Condenser Boundary Microphone Overview:

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 elementsavailable 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