- ページ 2
アンプ Crown DIFFEROID CM-311AのPDF 使用方法をオンラインで閲覧またはダウンロードできます。Crown DIFFEROID CM-311A 4 ページ。 Differoid head-worn condenser microphone
Crown DIFFEROID CM-311A にも： データシート (2 ページ), アプリケーション・マニュアル (14 ページ), 補足マニュアル (1 ページ), アプリケーション・マニュアル (6 ページ), 概要マニュアル (1 ページ), クイックマニュアル (2 ページ)
ページを印刷する
CM-311A
CM-311AE
D
esigned for touring and live-sound
applications, the Crown CM-311A
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 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 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.
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 the
wireless transmitter of your choice.
How to adjust for best fit and to prevent
boom bounce
Note: To get maximum the 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.
DIFFEROID
®
HEAD-WORN
CONDENSER MICROPHONE
Specifications
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 typical (0 dB = 0.0002 dyne/cm
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,
approximately equal to transmitter battery
life.
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 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,
unterminated.
Materials: High-impact plastic mic housing,
2
),
brass boom, steel wire headband, high-
impact plastic and 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-inch (13.97 cm)
diameter, adjustable. Boom approximately 7-
inch (17.78 cm) x 3-inch (7.62 cm). See
Figs. 3 and 4.
Included accessories: Microphone carrying
case, WS-6 foam pop filter, clothing clip.
Optional accessories: PH-4B phantom power
supply (4 channels, AC powered). PH-1A
phantom power supply (1 channel, battery
or AC-adapter powered). WS-14 accessory
windscreen.
*1 pascal = 10 dynes/cm
2
= 10 microbars = 94 dB SPL.