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Audio-Technica U851R Boundary Microphone

Product Code: AUU851R
Manufacturer: Audio-Technica

Free mainland UK shipping available for this product

Our Price £218.12INC

Available within 2-5 working days

Audio-Technica Authorised Reseller Europe

Featuring breakthrough audio and mechanical design innovations, the phantom-powered U851R offers outstanding speech intelligibility and transparent sound quality for surface-mount applications. The microphone is equipped with a PivotPoint® rotating output connector, UniSteep® filter and UniGuard® RFI-shielding technology. It accepts interchangeable condenser elements - available for boundary microphones in cardioid, hypercardioid and omnidirectional polar patterns. With a heavy die-cast case and silicon foam bottom pads to minimize coupling of surface vibration to the microphone, the U851R is equipped with self-contained electronics, eliminating the need for an external power module.


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)

Self-contained electronics eliminate need for external power module

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 finish for minimum visibility

Available in two colors: black (U851R) and white (U851RW)

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: 34 dB (19.9 mV) re 1V at 1 Pa

Impedance: 200 ohms

Maximum Input Sound Level: 134 dB SPL, 1 kHz at 1% T.H.D.

Dynamic Range: 108 dB, 1 kHz at Max SPL

Signal to Noise Ratio: 68 dB, 1 kHz at 1 Pa

Phantom Power Requiremens: 11-52V DC, 4 mA typical

Switch: Flat, roll-off

Weight: 9.2 oz (262 g)

Dimensions: 4.25" (108.0 mm) long, 3.31" (84.0 mm) maximum width, 0.91" (23.0 mm) height

Output Connector: TB3M-type

Cable: 25.0' (7.6 m) long, 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F and XLRM-type connectors

  • UK Based Company
  • Part of A.C. Entertainment Technologies - has its trading origins over 45 years ago
  • UK Stock Holding
  • UK Warranty
  • Free Delivery Over ?150
  • Great Prices
  • Over 20 Years' Experience
  • Specialist Advice
  • Fast Delivery
  • Finance Options Available

With years of experience supplying Businesses, Government Organisations, Charities, Schools, Colleges and Universities, we invite you to take advantage of our knowledge to help you make an informed choice, ensuring you are purchasing the best music products for your needs. With specialists in PA Systems, Pro Audio & Live Sound equipment on hand to answer calls and emails, you're in the best possible hands.

Contact us now to discuss your requirements or to request a quotation. Additional discounts may apply for educational establishments or size and value of order.

Purchase orders can be sent directly to or apply for your cash or credit account here. Terms and conditions will apply.

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