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Motorola External Speaker Headphone Mod?

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Mar 29, 2015
Orange County, CA
Can it be done? This is an external speaker that typically comes with a spectra. I know Motorola made the speakers for some Maxtrac's in an either a no ground or negative polarity fashion (can't remember which it was, don't have the site where I read it bookmarked), and things could go up in smoke if wired with your typical speaker. So I thought I'd ask here before I start modifying things.

I understand that there's a dispatcher headset that may be available (I've looked on ebay and haven't found one), and honestly, I'd like to adapt my black gm300 mic to the spectra as well..I've taken a liking to how it sounds and I don't want to be forced into a different mic.

What I'd like to do is mount a 3/4" headphone jack into the back of the speaker. To make it work properly, I imagine I'd have to wire it in a way that cuts off the speaker when plugged in.

Any ideas would be helpful. .Thanks!
Mar 30, 2005
So Cali
My Spectra has a black GM300 mic with LED on it, great combination.

I also have a Heil headset on my Spectra, Bob Heil said "it can NOT be done". I build the interfaces for the headsets.

The Spectra speaker output would require a transformer for most headsets. The output is a bridge amp, so nothing is referenced to ground like most headset earphones.

We are using the Audio Technica ATH 770 Com headsets in the EOC on Kenwood radios. These have a separate 'speaker' input.

Send me a PM, and I will be glad to share.
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