U851a

Cardioid Condenser Boundary Microphone

$425 + shipping (includes gst)


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
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

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

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

Accessories

AT8531 power module; battery; soft protective pouch

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

Optional Interchangeable Elements

UE-H hypercardioid (100°); 
UE-O omnidirectional (360°)

U851a Submittal Sheet (PDF) Download
U851a Spec Sheet (PDF) Download

Subscribe to our newsletter

Join our mailing list to receive the latest news and updates from Audio-Technica AU

You have Successfully Subscribed!