[Scanner] Scanner speaker combiners

[Tom Hirsch]

Kevin, the device you seek is called an audio mixer.  Radio Shack and lots
of other companies sell mixers.  Some of them are expensive professional
gear, and some of them are inexpensive pieces of consumer equipment.  You
can find used mixers at hamfests (I saw probably 4-5 mixers at a hamfest
Saturday), classified ads, auction websites, music stores, etc.  Ensure that
the mixer you buy has line-level audio inputs.  The output of  the scanners
is a line-level (amplified) signal.  Some mixers will take only
microphone-level (low strength, unamplified) signals.   Some mixers have
switches that allow you to select either line or mike level signals.   Most
mixers have a master gain volume control, in addition to the volume control
for each input.  This allows you to adjust the volume level of each radio
and also control the output volume of the mixed signal.  The output of the
mixer goes to a speaker (if the mixer has a speaker or headphone output) or
it would go to an audio amplifier if the mixer does not have a speaker
output on it.
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Kevin O'Rourke wrote:

> Is anyone aware of a fairly inexpensive and small device that will take
> the speaker-level output of multiple (oh, say 6) scanners, etc. and
> combine them into one speaker-level output?