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CM 300 external speaker

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SCPD

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I have heard a rumor that that CM 300 can be connected to an external speaker using a pin on the back. Is this true and if so how can I go about this?
 

mmckenna

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SCPD

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Pin 1 and Pin 16 on the rear connector.

See page 13:
http://www.repeater-builder.com/motorola/manuals/cm200-cm300-pm400-inst-guide.pdf

You can purchase the connectors from e-Bay. I'd recommend a seller with the screen name of MRE1032, I've purchased from him and had a good experience.

Here's the connector/cable you'll need:
Cable 15 Ext Speaker Motorola Maxtrac GM300 VHF UHF | eBay

Adding a big Motorola external speaker to these radios really makes them sound good.

Thanks for the awesome fast reply, that was cool and much appreciated. So I just take that bridge device, slide it onto the correct pins..solder the speaker wires onto the pig tails and boom?
 

mmckenna

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And here is the whole speaker already setup for that radio. I have several of these and they work great.

Motorola Speaker CDM1250 CDM1550 Maxtrac GM300 CM300 Incredible Quality New | eBay

That might be a good option.

I've got some similar style OEM speakers from Kenwood fed off an NX-700 and NX-900 in my work truck. Plenty loud enough, and have stood up well over many years.

I really do prefer these speakers, though:
Motorola External Speaker for Mobile Trunking CB or 2 Way Astro Spectra Radios | eBay
They are really loud if you are in a high noise environment. They also have a really nice deep bass tone to them that really helps with speech intelligibility in high noise environments. I'm using these fed by a VHF CDM-750 on a Polaris Ranger UTV. Even while flying down a logging road at 35MPH with a full face helmet on, I can still clearly hear radio traffic. In fact, when stopped, I have to turn the radio down or it'll hurt your ears.

Either way, getting an external speaker on these radios really helps. The stock speakers work pretty well, but they are kind of small for any location with background noise.
 

cmdrwill

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AND make sure that neither speaker lead is grounded. The radio has a bridge type audio amplifier each speaker 'floats'. (simple explanation)
 
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