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CDM1250 Internal/External speaker question

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Magnetsteve

Newbie
Joined
Jan 26, 2008
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13
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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

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Premium Subscriber
Joined
Oct 24, 2009
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2,574
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

Member
Joined
May 23, 2005
Messages
1,087
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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