U857R
Cardioid Condenser Adapter-mount Gooseneck Microphone

Designed for flexible performance in boardroom, school, government, house of worship and other installed applications, the high-performance U857R 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 adapter-mount gooseneck microphone direct mounts to any 5/8"-27 stand; it is 12.01” long. Equipped with UniGuard® innovations that offer unsurpassed immunity from radio frequency interference, the U857R accepts interchangeable elements, available in cardioid, hypercardioid, omnidirectional and UniLine™ line cardioid polar patterns. The phantom-powered microphone also offers an 80 Hz low-cut UniSteep® filter that reduces pickup of low-frequency ambient noise.

• 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

SPECIFICATIONS
ELEMENT	Fixed-charge back plate, permanently polarized condenser
POLAR PATTERN	Cardioid
FREQUENCY RESPONSE	30-20,000 Hz
LOW FREQUENCY ROLL-OFF	80 Hz, 18 dB/octave
OPEN CIRCUIT SENSITIVITY	–39 dB (11.2 mV) re 1V at 1 Pa
IMPEDANCE	250 ohms
MAXIMUM INPUT SOUND LEVEL	139 dB SPL, 1 kHz at 1% T.H.D.
DYNAMIC RANGE (typical)	115 dB, 1 kHz at Max SPL
SIGNAL-TO-NOISE RATIO	70 dB, 1 kHz at 1 Pa
PHANTOM POWER REQUIREMENTS	11-52V DC, 2 mA typical
SWITCH	Flat, roll-off
WEIGHT (MICROPHONE)	4.4 oz (124 g)
WEIGHT (POWER MODULE)	2.9 oz (81 g)
DIMENSIONS (MICROPHONE)	12.01" (305.0 mm) long, 0.48" (12.2 mm) head diameter
DIMENSIONS (POWER MODULE)	3.66" (92.9 mm) long, 0.74" (18.9 mm) diameter
OUTPUT CONNECTOR (POWER MODULE)	Integral 3-pin XLRM-type
CABLE	9.8' (3.0 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°); UE-UL UniLine™ (90°)
ACCESSORIES FURNISHED	AT8538 power module; AT8663 A-mount flange; AT8664 A-mount cable pass-through adapter; AT8153 two-stage foam windscreen
AUDIO-TECHNICA CASE STYLE	M2