Why you need the Crown CM311AESH Headset Microphone Designed for touring and live-sound applications, the Crown CM-311AESH is a rugged head-worn microphone with unequaled performance. It sounds like the best handheld microphones full, clear, and distortion-free, even with the loudest singers. The CM-311AESH is the latest version of Crown's proprietary Differoid technology. Its cardioid pickup pattern rejects sounds from the rear, such as floor monitors. Its noise-canceling ability rejects sounds at a distance, such as instruments on stage and crowd noise. This results in the CM-311AESH having outstanding gain-before-feedback and isolation. Features Full, clear, distortion-free sound Outstanding gain-before-feedback and isolation Connects to most wireless transmitters Transducer type: Electret condenser. Frequency response (typical): 50 Hz to 17,000 Hz Polar pattern: Cardioid Impedance: 6 kilohms unbalanced. Recommended load impedance: 10 kilohms Open-circuit sensitivity, typical, close-talking: CM-311AE, 1.25 mV/Pa (”58 dB re 1V/Pa). Power sensitivity, typical, close-talking: ”71.5 dB re 1 mW/Pa. Equivalent noise level (self noise): 26 dB SPL typical (0 dB = 0.0002 dyne/cm2), A-weighted. S/N ratio: 68 dB at 94 dB SPL. Maximum SPL: 140 dB SPL with 3V DC, 148 dB SPL with 9V DC. Operating voltage: 3”9V DC from the transmitter's battery. Polarity: Positive pressure on diaphragm produces positive voltage on shield with respect to white lead. Current drain: 0.27 mA nominal. Off-attenuation: 70 dB. Output connectors: supply your own to match your transmitter. Cable: In-line with this cable is a small circuit module that equalizes the microphone signal. Cable is 42-inches (106.68 cm) long from headband to module, 12-inches (30.48 cm) from module to cable end. 2-conductor shielded unbalanced cable, un-terminated. Materials: High-impact plastic mic housing, brass boom, steel wire headband Net weight: Head-worn mic, 2.1 oz (61 g) Dimensions: Headband 5.5-in. (13.97 cm) diameter, adjustable. Boom approximately 7 in. (17.78 cm) x 3 in. (7.62 cm). See Figs. 3 and 4. Included accessories: Microphone carrying case, WS-6 foam pop filter, clothing clip.
