KX3 distorted audio problem

KX3 #110 has had a problem ever since I received it. The audio through the speaker has always sounded badly distorted and buzzed at anything above a very low volume. Judging by comments in the KX3 Yahoo group this was not an uncommon problem. A couple of solutions were proposed, including removing the cloth between the speaker and its grille. As I could get perfect audio on headphones I decided to wait until the definitive solution was published and until I plucked up sufficient courage to take a screwdriver to the radio.

KX3 #110 awaits a replacement speaker

I opened the case and poked around with a finger to see if I could find what was vibrating. The buzzing was definitely coming from the speaker area so I concluded that the problem was the speaker cone vibrating against the grille cloth. I posted a message on the KX3 Yahoo group to see if I could determine the chances of a successful cure if I removed it. The replies suggested that the prospects were good. I also received an email from KX3 Support offering me a replacement speaker. Excellent customer service!

This morning I was feeling brave so I opened up the case and tried to remove the speaker. I took out the 4 screws but the clearances around the speaker are so tight it looked as if I might have to take the KX3 to pieces to remove it. With a bit more jiggling it came free (phew!) so I partially reassembled the two halves with the speaker poking out the front of the radio. I applied power and attached an antenna and various howling and squawking noises emerged from the speaker.

So the culprit really was the speaker! Perhaps it had been damaged during assembly (not by me, as this was an assembled radio.) I told KX3 Support that I would have to take up their offer of a replacement speaker. The KX3 will remain in two halves until I receive and install it.

Julian Moss, G4ILO, is a regular contributor to AmateurRadio.com and writes from Cumbria, England. Contact him at [email protected].

2 Responses to “KX3 distorted audio problem”

  • Ernest Gregoire, AA1IK:

    Sorry to hear about your speaker trouble with the Kx3 Julian. I have not hooked mine up to the antenna for days now. There has been a thunderstorm almost every day for the past 2 months here. My KX3 CW sounds Ok, but I must confess I have not tuned up to the SSB portion of the band yet; someday, maybe soon!

    de AA1IK

    Ernest Gregoire


  • Dan KB1VWQ:

    Did the replacement speaker ever solve the buzz, crackle and otherwise bad audio problem? I also have a low Ser# and my KX3 sounds like crap if you turn up the volume to anything other than low. And info would be great 73 . .

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