AKG CM311 A, CM311 AESH, CM311 L Users Manual

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DIFFEROID® HEAD-WORN

CM311 A CM311 AESH CM311 L

esigned for touring and live-sound applications, the AKG/Crown CM311

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 CM311 is the latest version of the AKG/Crown’s proprietary Differoid

technology. Its cardioid pickup pattern rejects sounds from the rear, such as floor monitors. Its noise-cancelling ability rejects sounds at a distance, such as instruments on stage and crowd noise. This results in the CM311 having outstanding gain-beforefeedback 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.

Three models are available: CM311 A, CM311 AESH and CM311 L. The CM311 A is powered by a 9 V 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 CM311 AESH has a T4AF connector, allowing you to connect with Shure® wireless systems. The L version offers a 3-pin mini XLR output, which fits all AKG wireless body-pack transmitters.

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 CM311 A 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.

CONDENSER MICROPHONE

Specifications

Transducer type: Frequency response (typical):

(see Fig. 1).

Polar pattern: Impedance:

AESH and CM311 L, 6 kilohms unbalanced.

Recommended load impedance:

1000 ohms or greater. CM311 AESH and CM311 L, 10 kilohms.

Open-circuit sensitivity, typical, close-talking:

CM311 A, 4 mV/Pa* (–48 dB re 1V/Pa), CM311 AESH and CM311 L, 1.25 mV/Pa

(–58 dB re 1V/Pa).

Power sensitivity, typical, close-talking:

CM311 A: – 42.5 dB re 1 mW/Pa*, CM311 AESH and CM311 L: –71.5 dB re 1 mW/Pa.

Equivalent noise level (self noise):

SPL typical (0 dB = 0.0002 dyne/cm2),

A-weighted.

S/N ratio: Maximum SPL:

3% THD. CM311 AESH and CM311 L, 140 dB SPL with 3V DC, 148 dB SPL with 9V DC.

Operating voltage:

alkaline battery or 18-48 V phantom power. CM311 AESH and CM311 L, 3-9 V DC from the transmitter’s battery.

Polarity:

produces positive voltage on CM311 A XLR pin 2 with respect to pin 3, and on CM 311 AESH and CM311 L shield with respect to white lead.

Current drain:

CM311 AESH and CM311 L, 0.27 mA nominal.

Battery life:

and CM311 L, approximately equal to transmitter battery life.

Electret condenser.

Cardioid (see Fig. 2).

CM311 A, 75 ohms balanced. CM311

68 dB at 94 dB SPL.

CM311 A, 148 dB SPL produces

CM311 A, 9 V DC internal

Positive pressure on diaphragm

CM311 A, 6.5 mA nominal.

CM311 A, 85 hours. CM311 AESH

50 Hz to 17,000 Hz

CM311 A,

26 dB

Off

attenuation:

t connectors:

R type). CM311 AESH, TA4F for Shure®

s boom, steel wire headband, high-

Satin black.

weight:

-inch (17.78 cm) x 3-inch (7.62 cm). Figs. 3 and 4.

d accessories:

, WS-6 foam pop filter, clothing clip.

-adapter powered). WS-14 accessory

l = 10 dynes/cm2 = 10 microbars = 94 dB SPL.

70 dB.

CM311 A, 3-pin pro audio

. CM311 L, 3-pin mini XLR.

High-impact plastic mic housing,

t plastic and steel battery pack.

Head-worn mic, 2.1 oz (61 g).

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

Headband 5.5-inch (13.97 cm)

r, adjustable. Boom approximately

Microphone carrying

l accessories:

y (4 channels, AC powered). PH-1A

m power supply (1 channel, battery or

PH-4B phantom power

Response

FRONT

REAR

180

Fig. 1

+15 +10

dB 0

-5

-10

-15

-20

-25

-30

-35 20 100 1K

Frequency Response

0˚, 1.375"

0˚ 2'

120˚, 2'

Frequency in Hz

10K 20K

Fig. 2

300˚

270˚

240˚

Polar

330˚

0˚

30˚

60˚

90˚

120˚

1000 Hz

210˚

300 Hz 6000 Hz

150˚

Fig. 3

MIC

Fig. 4

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