Cardioid Condenser Adapter-mount Gooseneck Microphone


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  • Designed for high-quality sound reinforcement, professional recording and broadcasting
  • Superior off-axis rejection for maximum gain before feedback
  • UniGuard® RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
  • Easy-to-adjust, rugged, small-diameter, alternating gooseneck with virtually no “memory” permits quick positioning into desired shape
  • UniSteep® filter provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality
  • Accepts interchangeable elements to permit angle of acceptance from 90° to 360°
  • Two-stage foam windscreen yields dramatically improved resistance to P-pops and other breath blasts
  • Direct mounts to any 5/8"-27 stand, or to included threaded mounting flange
  • Operates on battery or phantom power


Engineered for versatile positioning and extremely flexible performance in boardroom, school, government, house-of-worship and other installed applications, the U857AL features a small-diameter gooseneck with virtually no “memory.” Its ultra-flexible, robust design permits easy adjustment into desired shape while resisting inadvertent repositioning. This cardioid condenser gooseneck microphone direct mounts to any 5/8"-27 stand; it is 16.58" long. Equipped with UniGuard® innovations that offer unsurpassed immunity from radio frequency interference, the U857AL accepts interchangeable elements, available in cardioid, hypercardioid, omnidirectional and UniLine™ line cardioid polar patterns. The battery- or phantom-powered microphone also offers an 80 Hz low-cut UniSteep® filter that reduces pickup of low-frequency ambient noise.


Element Fixed-charge back plate, permanently polarised condenser
Polar Pattern Cardioid
Frequency Response 30 - 20,000 Hz
Open Circuit Sensitivity Phantom: -42 dB (7.9 mV) re 1V at 1 Pa
Battery: -43 dB (7.0 mV) re 1V at 1 Pa
Dynamic Range Phantom 109 dB 1kHz @ Max SPL, Battery 99dB 1kHz @ Max SPL
Signal-to-Noise Ratio 70 dB 1kHz @ 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)
Switches Off, on-flat, on-roll-off
Weight 131 g
Cable 3m long (permanently attached to microphone), 3.2mm diameter, 2-conductor shielded cable with TA3F-type connector
Dimensions Length 421mm, Head diameter 12.2mm
Output Connector Integral 3-pin XLRM-type
Accessories Included AT8531 power module, AT8153 two-stage foam windscreen, AT8663 A-mount flange, AT8664 A-mount cable pass-through adaptor, battery



U857AL Declaration of Conformity
U857AL Frequency Response
U857AL Polar Pattern
U857AL Specification Sheet