Audio Technica U851A Cardioid Condenser Boundary Microphone

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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.

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 silicon 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

[edit] Specs

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