Crown CM311A Headworn Microphone

High quality reproduction from a lightweight, compact mic!

Designed for touring and live sound applications, this is a rugged head-worn microphone with unequalled performance. It sounds like the best handheld microphones—full, clear, and distortion-free, even with the loudest singers. The CM-311A 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-311A having outstanding gain-before-feedback and isolation. Lightweight and comfortable, the mic’s headband and boom adjust to fit any singer. An included pop filter greatly reduces breath noise and pops. Because of the boom’s unique behind-the-ear design, it does not cover up the singer’s face.

• Powered by a 9V battery in the belt pack, or by 18 to 48V phantom power
• Includes a carrying case, WS-6 foam pop filter and clothing clip

Technical Description

Transducer type: Electret condenser

Frequency response (typical): 50 Hz to 17,000 Hz

Polar pattern: Cardioid

Impedance: 75 ohms balanced

Recommended load impedance: 1000ohms 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 (0 dB = 0.0002 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 or 18-48V phantom power

Polarity: Positive pressure on diaphragm produces positive voltage 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

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/ 61g CM-311A belt pack and battery 6.1 oz/ 173g

Warranty Information

3-year limited warranty on all Crown amps and microphones.