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CDM1250 Internal/External speaker question

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Magnetsteve

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Joined
Jan 26, 2008
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77
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Central Arkansas
I have searched high and low and have not found the exact answer I am looking for. I have recently put an external speaker on my CDM, but found that the audio is still coming from the internal speaker as well. I thought it would automatically stop using the internal speaker, but it did not. I want the audio to come from the external speaker only. Is it safe to unhook the internal speaker? or what... I just don't want to screw up my radio! I am sure you all understand! Thank you for your help.

-Drew
 

SteveC0625

Order of the Golden Dino since 1972
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Oct 24, 2009
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Location
Northville, NY (Fulton County)
I have searched high and low and have not found the exact answer I am looking for. I have recently put an external speaker on my CDM, but found that the audio is still coming from the internal speaker as well. I thought it would automatically stop using the internal speaker, but it did not. I want the audio to come from the external speaker only. Is it safe to unhook the internal speaker? or what... I just don't want to screw up my radio! I am sure you all understand! Thank you for your help.

-Drew

Per the Motorola Installation Manual for the CDM's:

On the Accessory Connector, Pin 1 is Speaker - and Pin 16 is Speaker +. The Audio PA is a bridge amplifier with a minimum load resistance of 3.2 ohms (3/4). The internal speaker can be disabled. Remove the control head, disconnect the speaker and reassemble.

You may want to obtain a copy of the install manual and read about proper removal and reassembly of the control head before attempting it. The manual also has full info on the accessory connector.
 

RKG

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May 23, 2005
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Location
Boston, MA
Also: be careful not to short those two pins, either to each other or either of them to ground. The CDM radios use balanced audio.
 
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