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Connecting CDM1250 to external PA system.

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Feb 23, 2020
Hi all,

I know there are a lot of threads referencing connecting motorola mobiles to external speakers but most refer to a singular speaker, and if I missed a thread referencing this topic I apologize in advance.

I’m looking to tie a CDM1250 into a PA system. The system design would contain the CDM, tied into an amp, which would then tie into multiple speakers each with individual volume controls.

Now I’ve tied CDM1250’s into singular external speakers, but I was wondering if there were other considerations, tips, etc. that I had to make when tying a CDM1250 into an amp and multiple speakers.

If anyone has any experience with this type of project, I’d love to hear how you made your set up.



Active Member
Mar 14, 2004
prior thread, same premise

Pin 11 - set for filtered audio out, do NOT use the speaker output, and people have used 1:1 matching transformers, caps & resistors to fine tune the audio with varying levels of success.

Pin 11 was how I always fed filtered RX audio to Bogen station distribution amps.


Dec 22, 2013
It has a BTL amp. You need an isolation transformer or you will damage the radio by grounding the speaker output terminals.


May 3, 2003
I've used CPI MR100 remote panels as line drivers for public address applications. The remote panel is fed receive audio from accessory pin 11 & provides a 0 dBm 600 ohm balanced line to the PA amp. The panel also mixes local microphone audio onto the balanced line so you don't hear one sided conversations over the PA speakers.
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