Description
Compact, boundary-type omni-directional electret condenser
microphone
Application
Enhance the pickup range for voice recorders and personal
assistive listening devices
Features
Sm all and uno btrusiv e; Da isy-cha inab le (no m ixer requ ired);
Dense body composition prevents skidding on any surface
Pickup range
8-12 ft. (may vary from 5 to 15 ft. depending on environmental
conditions)
Technical data.
Se ns itivity:
Output impedance:
Frequency Response:
Signal-to-noise Ratio:
Ph an tom po we r req uire m en t:
Current drain:
Dimensions:
W eigh t:
Sta nd ard cor d len gth
Connector, “j” version
-38 ± 3 dB
1.5 k S
100 Hz - 8 kHz
>60 dB
1.2 to 10 VDC
0.3 m A (m ax.)
2" triangle x e " H
2.5 oz
36in/91cm
3.5mm Mono plug
Centrum Sound
CM -3 (j)
Conference microphone
RoHS conform
C e ntr um S ou n d S ys te m s
572 La Conner Drive • Sunnyvale • CA 94087
http://centrumsound.com
Genera l: CM -3 is a bound ary microp hone, w here the ha rd
reflec tive s urfa ce it is plac ed o n co nstitutes the b oun dar y.
If the table is covered by a table cloth, place it on a dinner
plate, driver’s licence or other hard object. Place the
m icro phone(s ) so distan ce to the participants is as evenly
distribu ted as poss ible. Da isy-c haining m icro phones is
accomplished by inserting Y-adaptors anywhere in the
link. Th e orde r of m icro phones and w here th ey connect in
the ch ain do es n ot m atter.
Assistive listening Devices (ALD): A single microphone
can effective ly be use d on ta bles u p to 12 feet in leng th
(Table 1). For longer tables, two microphones chained
together with a Y-adaptor and/or an extension cable may
be required. The KJ-10 extension permits two
micro phone s to be place d up to 16 fee t apart (Table 2).
Digital Vo ice Rec orde rs (DVR ): DV Rs and handheld
micro-cassette recorders may be connected as ALDs.
However, not all devices can power two microphones,
par ticula rly thos e op era ting o n a s ingle 1.5 v olt ba ttery.
Compu ters: Practically all desktop and laptop c om puters
ca n pow er a t least fo ur m icro phones . Ho we ve r, it is
impo rtant that the chain starts w ith a KO-A sound card
ada ptor ins erted into the co m puter ’s m icroph one input.
From there, Y-adaptors and extension cables may be
inserted in the m os t co nv enient ord er a s shown in Table
3. If more than four microphones are required, we
rec om m end using an auto m atic mixer to avo id pos sible
echo effects. The Audio Technica AT-MX341 four-channel
SmartMixer is available through Centrum Sound.
User Guide