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Combining audio from 3 RF Decks to one speaker.

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Senior Member
Database Admin
Sep 25, 2001
Right here...
I have 3 NX RF decks installed with 3 extension speakers. I would like to sum the audio into 1 speaker from the 3.5 audio jack on each deck.


Apr 28, 2003
Cary, NC
There are a bunch of ways you can do this; passive combining, using resisters or transformers, or some sort of Active combining with a small audio 'mixer' (which would require probably DC power).

I don't know the technical level you're at; I don't want to assume how much you know, so if i go over your head or too far under, apologies.

There are several threads here on RR about this; here are some, in no particular order:

look at post #17 on this thread, it may explain it

There's a real simple passive system in post #22 on this thread:

And there's this at Instructables:

(this is the bare essence of a 'passive' mixer; a bunch of input jacks for the radios, resistor networks to glom (technical term, there) them all together without the output of one radio affecting the output of any other radio, which is what you would get if you tied your speaker feed from each radio to a common point and then tried to run it to a single speaker. It could be very bad, like crossing the streams bad. )

So, in the words that everyone hates to hear when they want a simple solution: "It depends (on what you want, and what you can afford both money and timewise)"
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