Crown Audio CM-311AE specifications Specifications, Features

POLAR

PATTERN

CM-311A CM-311AE

esigned for touring and live-sound applica-

DIFFEROID HEAD-WORN

CONDENSER MICROPHONE

Features

•Full, clear, distortion-free sound

•Outstanding gain-before-feedback and isolation

•CM-311A has battery/phantom belt pack

•CM-311AE connects to most wireless transmitters

Specifications

Dtions, the Crown® CM-311A is a rugged head-worn microphone with unequalled

performance. It sounds like the best handheld micro- phones—full, clear, and distortion-free, even with the loudest singers.

The CM-311A is the latest version of the 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 outstand- ing 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.

Two models are available: CM-311A and CM-311AE. The CM-311A is powered by a 9V battery or phantom power. It has a battery belt pack with an on/off switch, a programmable mic on/off switch, and a “Mic On” LED. The CM-311AE is a pig-tail version allowing you to connect it to most wireless transmitters.

NOTE: Putting an XLR connector on the CM-311AE and connecting to a mic input with phantom power WILL damage the mic element. For wired applica- tions, use the CM-311A.

Transducer type: Electret condenser.

Frequency response (typical): 50 Hz to 17,000 Hz (see Fig. 1).

Polar pattern: Cardioid (see Fig. 2).

Impedance: CM-311A, 75 ohms balanced. CM-311AE, 6 kilohms unbalanced.

Recommended load impedance: CM-311A, 1000 ohms or greater. CM-311AE, 10 kilohms.

Open-circuit sensitivity, typical, close-talking: CM- 311A, 4 mV/Pa* (–48 dB re 1V/Pa), CM-311AE, 1.25 mV/Pa (–58 dB re 1V/Pa).

Power sensitivity, typical, close-talking: CM-311A:–42.5 dB re 1 mW/Pa*, CM-311AE:–71.5 dB re 1 mW/Pa.

Equivalent noise level (self noise): 26 dB SPL typi- cal (0 dB = 0.0002 dyne/cm2), A-weighted.

S/N ratio: 68 dB at 94 dB SPL.

Maximum SPL: CM-311A, 148 dB SPL produces 3% THD. CM-311AE, 140 dB SPL with 3V DC, 148 dB SPL with 9V DC.

Operating voltage: CM-311A, 9V DC internal alkaline battery or 18-48V phantom power. CM-311AE, 3–9V DC from the transmitter’s battery.

Polarity: Positive pressure on diaphragm produces positive voltage on CM-311A XLR pin 2 with respect to pin 3, and on CM-311AE shield with respect to white lead.

Current drain: CM-311A, 6.5 mA nominal. CM-311AE, 0.27 mA nominal.

Battery life: CM-311A, 85 hours. CM-311AE, approxi- mately equal to transmitter battery life.

Optional accessories: PH-1A phantom power

supply (1 channel, AC-adapter powered). WS-

14 accessory windscreen.

*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB

Fig. 1

Frequency Response

Frequency in Hz

Fig. 2

Polar Response

How to adjust for best fit and to prevent boom bounce

Note: To get the maximum performance out of this microphone, take the time to adjust it to fit correctly.

For best results, the CM-311A MUST be custom fitted to a single user’s head. This simple procedure takes only a few minutes. Please refer to Fig. 5 and locate the parts described.

1.If the microphone is for yourself, we suggest that you use a mirror to double check the fit as you make adjustments.

2.Loosen (just a little) the thumbscrew located on the outside of the foam block, part way back on the boom. This allows the boom to slide in and out, and to rotate left and right.

3.Now bend the headband wire to fit your head. Put the foam-block wire behind your ear. Then you can bend the earpieces to fit snugly around your ears. The back of the headband should fit firmly against the back of your neck.

Operating temperature range: –10° to +50° C, or –14° to +122° F.

Off-attenuation: 70 dB.

Output connectors: CM-311A,3-pin pro audio (XLR type). CM-311AE, supply your own to match your transmitter.

Cables (CM-311A):2-conductor shielded, unbalanced cable, 42-inches (106.68 cm) from headband to battery pack. Use 2-conductor shielded mic cable (not included) between XLR connector and mixer mic input.

Cable (CM-311AE):In-line with this cable is a small	Fig. 3
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 unbal-
anced cable, unterminated.
Materials: High-impact plastic mic housing, brass
boom, steel wire headband, high-impact plastic and		MIC
steel battery pack.

Finish: Satin black.

Net weight: Head-worn mic, 2.1 oz (61 g). CM-311A

belt pack and battery, 6.1 oz (173g).

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.