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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
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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