Overview

The phantom-powered U851Rb condenser boundary microphone offers outstanding speech intelligibility and transparent sound quality for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing, and other demanding sound pickup situations. The microphone is equipped with a PivotPoint® rotating output connector, UniSteep® filter, and UniGuard® RFI-shielding technology. It accepts interchangeable condenser elements – omnidirectional (360°), cardioid (120°), and hypercardioid (100°) – available separately. With a heavy die-cast case and silicon foam bottom pads to minimize coupling of surface vibration to the microphone, the U851Rb is equipped with self-contained electronics, eliminating the need for an external power module. Threaded inserts on the bottom of the microphone allow it to be mounted with screws for increased security. 

Features

• Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
• Superior off-axis rejection for maximum gain before feedback
• PivotPoint® rotating output connector allows cable to exit from either the rear or the bottom of the microphone
• Small-diameter UniPoint® element near boundary eliminates phase distortion and delivers clear, high-output performance
• Available interchangeable elements permit angle of acceptance from 100° to 360°
• UniGuard® RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
• Self-contained electronics eliminate need for external power module
• 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 finish for minimum visibility
• Threaded inserts on bottom of microphone allow it to be mounted with screws for increased security

Specifications

• Element: Fixed-charge back plate, permanently polarized condenser
• Frequency Response: 20-20,000 Hz
• Low Frequency Roll Off: 80 Hz, 18 dB/octave
• Open Circuit Sensitivity: -34 dB (19.9 mV) re 1V at 1 Pa
• 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, A-weighted
• Phantom Power Requirements: 11-52V DC, 4.4 mA
• Switches: Flat, roll-off
• Weight: 253 g (8.9 oz)
• Cable: 25.0' (7.6 m) long, 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F and XLRM connectors
• Dimensions: 0.91" (23.0 mm) H x 3.30" (83.9 mm) W x 4.25" (108.0 mm) D
• Output Connector: Microphone: TB3M-type Cable: 3-pin XLRM-type
• Optional Interchangeable Elements: UE-C cardioid (120°), UE-H hypercardioid (100°), UE-O omnidirectional (360°)
• Accessories Included: Soft protective pouch