The CM-3 omni-directional conference
microphone has been designed to enhance the pickup range for personal assistive listening devices thus eliminating the need to pass the
microphone around to every speaker. Typical applications includes conference tables, panel set up, round table discussions, split-table set
up, dinner arrangements, etc.
The CM-3 works with all brand name personal assistive listening devices employing electret microphones such as personal amplifiers, FM systems, Teleloop systems and IR systems.
The CM-3 is completely portable. The main body fits in palm of hand. The contemporary compact design affords discrete setup at any table. A dense body composition combined with large rubber feet prevents skidding on any
surface and reduces annoying mechanical
noises usually associated with group
arrangements.
The CM-3 is a so-called boundary type
microphone where the hard reflective surface it is placed on constitutes the boundary. To enhance intelligibility for the hearing impaired person, the microphone has been designed to provide a 10 dB boost at 3 kHz. Other advantages of the boundary microphone over conventional designs includes clearer sound, consistent tone quality, lower noise level and low vibration sensitivity.
The typical pickup range of the CM-3 is
approximately 8-10 feet. However, the
realized range may vary from 5 to 15 feet depending on environmental conditions and the individual user's discrimination score.
The effective pickup range can be expanded substantially by daisy chaining two or more CM-3 microphones together with V-cords, Y-splitters and extension cords. Most listening devices, such as personal FM systems, can power at
least two CM-3 microphones. Daisy chaining is most commonly used with panel type set up and split-table set up.
Typical Data
Sensitivity @ 1 kHz . . . . . . . . . . . -38 dB � 3dB
Output impedance . . . . . . . . . . . . . . . . 1.5 KS
Directivity . . . . . . . . . . . . . . . Omni-directional
Signal-to-noise ratio . . . . . . . . . . . . . . > 60 dB
Frequency response . . . . . . . . . . 100 Hz -8 kHz
Phantom power . . . . . . . . . . . . . 1.5 to 10 VDC
Sensitivity reduction . . . . . . .Within -3 dB at 1V
Current drain . . . . . . . . . . . . . 0.3 mA maximum
Weight . . . . . . . . . . . . . . . . . . . . . . . 2.5 oz.
Dimensions . . . . . . . . . . . . . . 2" triangle x e" H
Standard cord length . . . . . . . . . . . . . . . . 36"
Connector . . . . . . . . . . 2.5 or 3.5 mm Mini-plug
User Guide Description
Compact, boundary-type omni-directional electret condenser
microphone
Application
Enhance the pickup range for voice recorders and personal assistive listening devices
Features
Small and unobtrusive; Daisy-chainable (no mixer 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)
