Crown CM311A Headworn Differoid noise-canceling Headset Brand New FREE SHIP + Get $5.00 Coupon 4 Next Purchase Start Price USD 249.95 Current Price USD 249.95 Time Left - Bid Count 0 Buy It Now Price - Reserve Price - Start Time Saturday, October 11, 2008 End Time Saturday, October 18, 2008 Location Lombard, Illinois See more about 'Crown CM311A Headworn Differoid noise-canceling Headset' Description Developed for and with major performing musicians reaching for clarity with increased gain before feedback. Crown’s differoid concept was perfect for the task. The CM311A increases gain before feedback by as much as 6-12dB. The Crown CM311A only transmits what is the differential of the front and back elements increasing rejection of unwanted background noise and discriminates against distant sound sources such as monitor loudspeakers and instruments. Solve your on-stage problems with a hands free CM311A. The CM311A terminates in a belt clip housing that can be phantom powered or battery powered. It has XLR out as well as a line out to feed a wireless transmitter. The CM311A/E is provided with stripped leads and a wiring diagram for popular wireless systems. CM312A has a standard cardioid element.Specifications Transducer type: Electret condenser Frequency response (typical): 50 Hz to 17,000 Hz Polar pattern: Cardioid Impedance: 75 ohms balanced Recommended load impedance: 1000 ohms or greater Open-circuit sensitivity, typical, close-talking: 4 mV/Pa (-48 dB re 1V/Pa) Power sensitivity, typical, close-talking: -42.5 dB re 1 mW/Pa Equivalent noise level (self noise): 26 dB SPL typical, A-weighted S/N ratio: 68 dB at 94 dB SPL Maximum SPL: 148 dB SPL produces 3% THD Operating voltage: 9V DC internal alkaline battery or 18-48V phantom power Polarity: Positive pressure on diaphragm produces positive voltage on XLR pin 2 with respect to pin 3 Current drain: 6.5 mA nominal Battery life: 85 hours Off-attenuation: 70 dB Output connectors: 3-pin pro audio (XLR type) Cables: 2-conductor shielded, unbalanced cable, 42" (106.68 cm) from headband to battery pack. Use 2-conductor shielded mic cable (not included) between XLR connector and mixer mic input Materials: High-impact plastic mic housing, brass boom, steel wire headband, high-impact plastic and steel battery pack Finish: Satin black Net weight: Head-worn mic: 2.1 oz (61 g) Belt pack and battery: 6.1 oz (173 g) Dimensions: Headband: 5.5" (13.97 cm) diameter, adjustable Boom: approx. 7" (17.78 cm) x 3" (7.62 cm) Included accessories: Microphone carrying case, WS-6 foam pop filter, clothing clip Purchase this item and receive a $5.00 coupon for your next purchase at our website. Call us for your price and expert advice: 630-693-0719  © AP6.0 uareTrade © squaretrade warranty v2.0 Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items. Place a Bid!