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Crown CM-311 AHS Microphone Same as CM-311A but mounts on a Sony MDR-7506 headphone. Great for hi-fi announcing with isolation. Designed for broadcasters, the Crown® CM-311AHS is a rugged head-worn microphone that mounts on a Sony MDR-7506 or MDR-V6 headphone. The mic rejects background noise extremely well and is ideal for use in sporting events. For background noise that is extremely high, as in traffic-copters and car races, you may need the extra isolation of a David Clark headset. Crown makes an adapter for the boom on the David Clark headset. You can special-order the adapter from Crown. The CM-311AHS is the latest version of Crown's patented Differoid® technology. Its cardioid pickup pattern rejects noise from behind the microphone and its noise-canceling ability rejects ambient noise at a distance. Lightweight and comfortable, the microphone adjusts to fit any user. It mounts securely on either earpiece of the popular Sony MDR-7506 or MDR-V6 headphone. Two included foam pop filters reduce breath noise, and the windscreen reduces wind noise. Supplied with the microphone is a belt pack. It includes a male 3-pin XLR-type output connector, a battery on/off switch, a programmable mic on/off switch, and a "Mic On" LED. The belt clip has been designed extra strong to prevent breakage and to keep it securely on your belt. The microphone is an electret condenser type, powered by phantom power or by the 9V battery in the belt pack. Specifications: Transducer type: Electret condenser. Frequency response (typical): 50 Hz to 15 kHz (see Fig. 2). Polar pattern: Cardioid (see Fig.3). Impedance: 75 ohms balanced. Open-circuit sensitivity, typical, close-talking: 4 mV/Pa* (-48 dB re 1 V/Pa*). Power sensitivity, typical, close-talking: -42.5 dB re 1 mW/Pa. Equivalent noise level (self-noise): 26 dB SPL typical (0 dB=.0002 dyne/cm2), 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 (not supplied) or 18-48V phantom power. Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3 of output connector. Current drain: 5 mA. Battery life: 110 hours. Output connector: 3-pin pro audio (XLR type). Cables: 2-conductor shielded, unbalanced cable, 4-feet (1.219-m) from mic capsule to battery pack. Use 2-conductor shielded mic cable (not included) between XLR-type connector and mixer mic input. Materials: High-impact plastic mic housing and headphone mount, steel mesh grille screen, brass boom, steel wire headband, high-impact plastic and steel battery pack. Finish: Satin black. Net weight: Headworn mic and mount, 2.3 oz. (64 g). Belt pack and battery, 6.1 oz. (173 g). Dimensions: See Figs. 4 and 5. Included accessories: Microphone carrying case, WS-6 foam pop filter, WS-13 two-stage pop filter and WS-14 windscreen. Optional accessories: PH-4B phantom power supply (4 channels, AC powered). PH-1A phantom power supply (1 channel, battery or AC/DC adapter powered). Replacement parts: WS-6 foam pop filter, WS-13 two-stage pop filter, and WS-14 windscreen. *1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.
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