Motorola Speaker Mic Issues

[chief21]

I have three OEM speaker mics - two are model NMN6193B and one is NMN6193C. I have connected each of them alternately to an XTS3000, an XTS5000 and an EFJ5100.

All of the HT's work normally without the speaker mics attached. With the speaker mics attached, TX audio on all radios is OK, but two of the three speaker mics have tinny and distorted audio on receive on all of the above HT's.

AFAIK, these are the correct accessories for each of these HT's and, except for cord issues, I've always thought of these items as nearly bullet-proof. Is there some issue that I am not aware of or might it simply be that the poor-sounding speakers are just defective? Any suggestions are welcomed.

John

 

[yaknamedjak]

Where did you get the mics? If the audio doesn't sound right it's probably an issue in the wiring. That mic and both revisions should work fine on those radios. IIRC the C revision just added noise cancellation or additional voice isolation. Did u try unplugging the wire from the good speaker mic and using it with one that you're have issues with? If you pull the rubber boot back you should be able to unplug the wire and swap it to another mic head. It could also be water damage to the speaker.


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[Skypilot007]

I have three OEM speaker mics - two are model NMN6193B and one is NMN6193C. I have connected each of them alternately to an XTS3000, an XTS5000 and an EFJ5100.

All of the HT's work normally without the speaker mics attached. With the speaker mics attached, TX audio on all radios is OK, but two of the three speaker mics have tinny and distorted audio on receive on all of the above HT's.

AFAIK, these are the correct accessories for each of these HT's and, except for cord issues, I've always thought of these items as nearly bullet-proof. Is there some issue that I am not aware of or might it simply be that the poor-sounding speakers are just defective? Any suggestions are welcomed.

John

Speaker mics are a compromise when it comes to RX audio especially on an XTS3000 which have great audio from the radio's speaker. The commander series mics have better audio than the two you mentioned above but still no match compared to the radios built in speaker.

 

[chief21]

Thanks for the suggestions. Since I don't know the history of these speaker mics, the water damage possibility is real.

As I mentioned in the OP, one of the three speaker mics has great audio on all three of the HT's. The audio on the other two speaker mics is tinny and distorted... to the point where it's difficult to understand.

I did switch cables on one of the bad units and there was no change.

John

 

[Tech792]

Most likely the speakers themselves. They go bad all the time. I've replaced many over the years.

 

[12dbsinad]

Yep, speaker. Changed them as well.

 

[chief21]

I was wondering if this was a common problem. Thanks.

I see lots of speaker mic heads (without cords) for sale on that auction site, usually in multiple item lots. I wonder what the likelihood might be that all (or at least most) of them are not defective?

John