Operating Distance
Under line-of-sight conditions out in the open, the units may operate over a distance of 150 feet or more. Indoors, where there are reflections, the units should maintain communication over a distance of 15 to 20 feet even if the Listener and Talkers occasionally turn their backs to each other.
Technical
Specifications
Power Consumption: 50-65
mA at nominal voltage
Battery Life: 10-13 hours
Charging Time: Typically 2-3 hours from “empty”
Environmental Performance: Operating: -10 to +45 °C
Charging: 0 to +35 °C
Storage: -10 to +45 °C
Radio Performance: 20 meters (66 feet) min in free space
Audio Performance:
Frequency Bandwidth: 8 kHz (7 kHz for two-way system)
Acoustic Insertion Gain at Startup (preset volume): 20 dB gain
Volume Control Gain Range: 4 dB to 66 dB*
Maximum output: 119 dB SPL*
Total Harmonic Distortion: < 2%
End-to-end Delay: 22-32 msec (low-interference environments);
30-40 msec (four microphone systems)
Earphone Minimum Output Impedance: 10 Ohms
Telecoil Minimum Output Impedance: 10 Ohms
Max Voltage Swing at Receiver Output: 1.95-2.00 Vpp
Antenna: Internal
Microphone: Noise-canceling electret condenser
*Notes:
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Gain and output depend on the earphone that is used. These specifications apply
when the Companion Mics system is used with the supplied 6i Isolator™
earphones.
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Maximum output is measured into a 2cc coupler with 90 dB SPL input.
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Technical note for audiologists: When a hearing aid microphone is moved from
the ear of the listener to a position a few inches below the talker’s
mouth, an increase of 16-20 dB SPL is obtained. Insertion gain refers to the
increase in ear canal SPL provided by the Companion Mics system compared to
listening directly to a talker one meter in front of the listener.