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Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

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Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Sun Oct 25, 2020 2:31 pm
by zakduff
I had a ground loop issue so i found a few posts on here which instructed the following:

“At the speaker ends of both balanced cables, open the connectors and snip out the cable screen connections (to the sleeve or pin 1). “

I have done this and it has resolved my issue and no longer have a buzzing sound however when I turn off my studio monitor it pops loudly. Obviously I’m turning my (powered) studio monitors off first and my volume is down on my audio interface but it still pops really loudly.

Any advice will be appreciated

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Sun Oct 25, 2020 2:48 pm
by zakduff
Update:

Not sure what was causing it but it’s not happening anymore

I did have another XLR cable plugged in to my other monitor which I hadn’t altered yet.

I also did turn it off only about 10 seconds after powering it on.

Guessing it was one of these two factors that was causing it to pop?

But hey ho, its OK now :)

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Sun Oct 25, 2020 4:16 pm
by Hugh Robjohns
:thumbup:

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Mon Oct 26, 2020 4:27 pm
by Martin Walker
Hi zakduff, and welcome to the SOS Forums! 8-)

Glad to hear you've solved your problem, but if anyone else wants more info on possible XLR pin 1 ground loop problems, have a read of my Q&A here:

https://www.soundonsound.com/sound-advi ... ound-loops


Martin

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Sun Nov 22, 2020 4:22 pm
by zakduff
Hugh Robjohns wrote::thumbup:

Hi Hugh,

Late update but when i’ve just turned my studio monitor on its caused a loud pop similar to that time i turned it off.

It was the same monitor (right) as last time, any ideas? :)

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Sun Nov 22, 2020 5:32 pm
by Hugh Robjohns
Could be myriad reasons. I wouldn't be concerned u less it becomes a regular thing.

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Wed Nov 25, 2020 6:08 pm
by zakduff
Hi Hugh,

Admittedly I hadn’t turned my monitors on since uploading this post

I have just filmed turning them on and right monitor popped again and then the left monitor started buzzing

https://streamable.com/wtcq9a

Please see the above link (sorry if i am not suppose to share video links)

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Thu Nov 26, 2020 6:08 pm
by zakduff
Hugh Robjohns wrote:Could be myriad reasons. I wouldn't be concerned u less it becomes a regular thing.


Admittedly I hadn’t turned my monitors on since uploading this post

I have just filmed turning them on and right monitor popped again and then the left monitor started buzzing

https://streamable.com/wtcq9a

Please see the above link (sorry if i am not suppose to share video links)

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Thu Nov 26, 2020 7:37 pm
by James Perrett
Have you checked that the monitors are actually grounded? Do they have a 3 core power cable? Has the power wiring in your studio been checked recently?

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Thu Nov 26, 2020 8:44 pm
by zakduff
James Perrett wrote:Have you checked that the monitors are actually grounded? Do they have a 3 core power cable? Has the power wiring in your studio been checked recently?

Yes, yes and no :D

What checks would that be specifically?

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Thu Nov 26, 2020 9:15 pm
by James Perrett
If you are in the UK I'd suggest one of the socket testers with three lights on them like the one at

https://www.toolstation.com/socket-tester/p82826

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Thu Nov 26, 2020 11:31 pm
by zakduff
Yes i am in UK, I’ll order one and see :) Thanks James

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Mon Dec 07, 2020 5:25 pm
by zakduff
James Perrett wrote:If you are in the UK I'd suggest one of the socket testers with three lights on them like the one at

https://www.toolstation.com/socket-tester/p82826

Hi James,

I have just tested all the sockets and they have indicated “correct” so now I am stumped!

Any ideas? :)

Thanks again,
Zak

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Mon Dec 07, 2020 11:31 pm
by James Perrett
I'm a bit stumped. Have you checked that pin 1 of the XLR is connected to the ground pin of the mains plug? I'm just wondering if your monitors suffer from a 'pin 1 problem' where pin 1 goes around the houses before reaching ground.

Re: Ground loop issue, snipped cable screen connections to pin 1 now monitor pops loud when turned off

PostPosted: Mon Dec 07, 2020 11:40 pm
by Hugh Robjohns
It would be worthwhile disconnecting the audio cables completely and then turning the speakers on-off to see if the popping is related to the audio lines or just the speakers themselves.

It is possible that the disconnected screens in the cables are allowing interference to get in from the mains switch arcing or something, but as I recall the screens were cut to fix a ground-loop problem.

So if the speakers are click-free without the audio cables connected it may be necessary to find a different solution to the ground loop -- possibly a transformer isolator, for example.