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Old 04-13-2017, 11:40 AM
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Default Speaker issues - amplified

I have an amplified speaker in my vehicle (possibly a Speco). Since I switched out my 99XT with my TRX 2 I can no longer get sound to that speaker using the out on the back - only the hedaphone jack. When I plug in an older Radio Shack non-amplified speaker, it works on both ports. If I barely plug in the amp-ed speaker to the back or the TRX I can get sound, but obviously this is not a solution.

Am I missing something?
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Old 04-13-2017, 12:05 PM
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Same issue here with my TRX-2 with amplified speaker. Using a separate power source for radio and speaker solved the problem but that isnt practical so I went with a Motorola non-amplified speaker. Isolating scanner and speaker power source should work if you want to go to that hassle.

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Old 04-13-2017, 12:41 PM
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Quote:
Originally Posted by hosehead88 View Post
When I plug in an older Radio Shack non-amplified speaker, it works on both ports. If I barely plug in the amp-ed speaker to the back or the TRX I can get sound...
I have found that using a mono plug (or mono to stereo adapter) on the scanner side takes care of the issue. GRE used a funky pinout on the speaker out jack which likely carried over to Whistler models.

Shawn
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Old 05-12-2017, 1:44 PM
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I would like to thank those in this thread: https://forums.radioreference.com/wh...nnections.html for the discussion. I picked up a Mpow and it cured all of my problems: ignition noise, the ability to use the speaker out jack and the subsequent popping noise that I got when using the speaker jack partially plugged in. Outstanding!
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Old 05-12-2017, 6:42 PM
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I would guess that the Whistler scanners probably require a stereo jack plug while maybe hosehead88's speaker has only a mono one.

But that's very much just a guess.
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Old 05-13-2017, 11:10 AM
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Quote:
Originally Posted by BrianG61UK View Post
I would guess that the Whistler scanners probably require a stereo jack plug while maybe hosehead88's speaker has only a mono one.

But that's very much just a guess.
You are correct. The GRE PSR-800 used a mono jack and Whister, starting with WS-1080 uses a stereo jack.
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Old 05-13-2017, 2:03 PM
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I had tried a mono to stereo adapter and that did not work. Everything was corrected with the Mpow
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Old 05-13-2017, 2:54 PM
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Quote:
Originally Posted by hosehead88 View Post
I had tried a mono to stereo adapter and that did not work. Everything was corrected with the Mpow
There is no correct adapter available. You would need a stereo to mono (the other way round). As far as I know the only way is to get someone to cut off the mono plug and fit a stereo one. The Mpow is probably just making it so that the short caused by the mono plug in a stereo socket isn't completely shorting all the signal, just some of it.

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Old 05-15-2017, 9:12 AM
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I should add:

The Mpow isolator is probably a good idea for in car amplified speakers.

You could make an adapter - it would be like a stereo extension lead without the ring (right channel) connected through.

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Old 05-15-2017, 10:25 AM
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Why would I need to change anything now that it is working fine?
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Old 05-15-2017, 2:09 PM
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You probably don't need to do anything unless you're a perfectionist and don't like the idea that one channel of the Mpow is feeding into a short circuit.

I don't know exactly what's inside the Mpow isolators but it probably doesn't matter if one channel is shorted.
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