Centrum Sound Systems CM-3 User manual

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 unobtrusive; Daisy-chainable (no m ixer required);
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.
Sensitivity: -38 ± 3 dB
Output impedance: 1.5 kS
Frequency Response: 100 Hz - 8 kHz
Signal-to-noise Ratio: >60 dB
Phantom power requirement: 1.2 to 10 VDC
Current drain: 0.3 mA (m ax.)
Dimensions: 2" triangle x e" H
W eigh t: 2.5 oz
Standard cord length 36in/91cm
Connector, “j” version 3.5mm Mono plug
Centrum Sound Systems
572 La Conner Drive • Sunnyvale • CA 94087
http://centrumsound.com
Centrum Sound
CM-3 (j)
Conference microphone
RoHS conform
User Guide
General: CM-3 is a boundary microphone, where the hard
reflective surface it is placed on constitutes the boundary.
If the table is covered by a table cloth, place it on a dinner
plate, driver’s licence or other hard object. Place the
microphone(s) so distance to the participants is as evenly
distributed as possible. Daisy-chaining microphones is
accomplished by inserting Y-adaptors anywhere in the
link. Th e order of m icrophones and where they connect in
the chain does not matter.
Assistive listening Devices (ALD): A single microphone
can effectively be used on tables up to 12 feet in length
(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
microphones to be placed up to 16 feet apart (Table 2).
Digital Voice Recorders (DVR): DVRs and handheld
micro-cassette recorders may be connected as ALDs.
However, not all devices can power two microphones,
particularly those operating on a single 1.5 volt battery.
Computers: Practically all desktop and laptop computers
can power at least four m icrophones. However, it is
important that the chain starts with a KO-A sound card
adaptor inserted into the computer’s microphone input.
From there, Y-adaptors and extension cables may be
inserted in the m ost convenient order as shown in Table
3. If more than four microphones are required, we
recom mend using an automatic mixer to avoid possible
echo effects. The Audio Technica AT-MX341 four-channel
SmartMixer is available through Centrum Sound.