AV and Multimedia Related Thread, Hummmmmmmm from speakers in Technical; Originally Posted by Koldov
Think this is the 'ground lifting' mentioned, some of the more expensive boxes have a switch ...
24th October 2013, 04:16 PM #16
Well Hum or Howl...it is difficult to describe the sound in words
Originally Posted by Koldov
It is not just the usual low level background 'hum' and not a feedback squeal. I guess I could try recording it later?
24th October 2013, 06:11 PM #17
OK so I cut about 0.5mm of the insulation from around the base of the pin and hey presto...noise is gone!
Thanks to CESIL from:
mac_shinobi (24th October 2013)
24th October 2013, 06:15 PM #18
Base of what pin - earth pin on the three pin plug or what exactly ?
Originally Posted by CESIL
24th October 2013, 06:55 PM #19
Nothing that drastic...
Originally Posted by mac_shinobi
0.5mm of insulation from the base of the jack plug pin on the audio cable...
Not even I would mess with the mains plug
28th October 2013, 12:27 PM #20
I have used the above in many installations and temp setups with ground loops and all problems with audio humm were solved, you don't need an £80 box for that job usually
Originally Posted by crc-ict
28th October 2013, 02:16 PM #21
Any chance of some photos @CESIL ??
Originally Posted by CESIL
4th November 2013, 12:49 PM #22
I second the photo request @CESIL and just out of interest, may I ask what brought you to that conclusion?
4th November 2013, 02:07 PM #23
I've experienced the hum, 'sometimes' if you don't have the manufacturers software installed the sound card won't change to the correct output mode. it will treat every device on the audio out as "headphone" but with the manufacturers software, Realtek in my case, you can see it switch the output to "line". When it does this the ground loop issue goes away.
I've seen this with sigmatel as well.
This issue has hit me more recently as we've moved to windows 7 that normally has the right sound drivers in already. So we didn't bother with the manufacturers version. Whereas on XP we had to install it.
4th November 2013, 03:24 PM #24
Sorry for the slow reply folks, but I was not at work last week...
For those who wanted to know what the fix was I have produced a natty illustration which will show it better than a photo...
@Koldov...I found that pushing the plug very firmly up against the laptop socket stopped the noise and that suggested that that there may be a contact problem...
4th November 2013, 03:33 PM #25
Ah I can see now what the earlier description meant (I was thinking you were stripping insulation from the cable, hence the wut?). Luckily, your natty little illustration explains things very clearly (a picture paints a thousand words...) Thank you.
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