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APX8500 Sound coming from both control heads and external speakers?

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AFDFireMedic

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Hi,

We are putting a new ambulance in service and I have a APX8500 with three control heads installed. The front cab control head has an external speaker, and the two in the patient compartment control heads have the telephone style remote speaker-mics for privacy. My issue is that I'm getting audio from EVERYWHERE. It's coming from the external speaker up front, both the telephone mics AND the 3 control heads.

I only want audio to be coming from the external sources, how to I disable the audio from the control heads? I've never had this issue before when installing external speakers to a single control head so I'm not sure what's up or different.

Did I miss something in CPS? Are they wired incorrectly?

Any help would be greatly appreciated!
 

AFDFireMedic

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O2 control head? Unplug the internal speaker.

Yes, they are O2 control heads and I could do that... but why is this happening? All my single control head O2's just work when connected to an external speaker (and by "work" I mean don't also produce sound from the head speaker).
 

crazyboy

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Either it is and you’re not noticing it or someone already unplugged the internal speaker.
 

AFDFireMedic

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Either it is and you’re not noticing it or someone already unplugged the internal speaker.

Okay, I must just never have notice this before or as you said they've all been unplugged in the past. My radio vendor is coming back to disconnect the speakers. Thanks for the info!
 

cmdrwill

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control heads have the telephone style remote speaker-mics

Most all installations that have handsets, "telephone style", have a hang up cup. In the hang up cup is a switch that is used to disable the speaker when the handset is out of the cup. HUB aka hang up box, check the HUB setting in the programming of the radio/control head.
 
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