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Vega 56 coil whine through JBL LSR 305?

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post #1 of 11 (permalink) Old 10-21-2019, 04:59 PM - Thread Starter
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Vega 56 coil whine through JBL LSR 305?

My computer specs are below, i power those monitors through a douk 1796 DAC. Anyone can figure out why this coil whine only happens when there's a GPU load and why it's audible through monitors?
How can i fix this?
Thank you.

(i am still uploading the video)

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post #2 of 11 (permalink) Old 10-22-2019, 07:43 AM
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Groundloop. Almost every imaginable issue with studio monitors in PC environment is caused by it, grounded speakers are simply not designed to be used with a grounded PC.
Try out the external PSU-mode that the DAC has, it could help with the issue. If it doesn't help then GLI (ground loop isolator) or a new optical DAC is the only way forward. There's also the ghetto-mod where you use electrical tape to tape out the grounding prongs, but I would recommend using it only for troubleshooting purposes.

Ppl should learn to add more info to their posts when they ask for help...
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Last edited by Tiihokatti; 10-22-2019 at 07:55 AM.
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post #3 of 11 (permalink) Old 10-22-2019, 12:50 PM - Thread Starter
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Quote: Originally Posted by Tiihokatti View Post
Groundloop. Almost every imaginable issue with studio monitors in PC environment is caused by it, grounded speakers are simply not designed to be used with a grounded PC.
Try out the external PSU-mode that the DAC has, it could help with the issue. If it doesn't help then GLI (ground loop isolator) or a new optical DAC is the only way forward. There's also the ghetto-mod where you use electrical tape to tape out the grounding prongs, but I would recommend using it only for troubleshooting purposes.
https://www.amazon.it/Isolator-isola...4&sr=8-2-fkmr0 Would this suffice? Using it between fostex and the DAC.
Douk1796 doesn't seem to have an external psu mode. Wouldn't it increase audio lag since too many connections before audio source?

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post #4 of 11 (permalink) Old 10-22-2019, 01:05 PM
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I can't view the video, but did have audible hissing sound. It annoyed me so much for so long, was trying to sell speakers.
Then tried these and they work perfectly!
3-Prong to 2-Prong Adapter Grounding Converter

Either buy those adapter, or take pliers and pull out the 3rd ground prong, or change the cable if you have extra laying around that are 2 prongs.
The adapter fixed the problem personally

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post #5 of 11 (permalink) Old 10-22-2019, 01:59 PM
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Quote: Originally Posted by Synoxia View Post
https://www.amazon.it/Isolator-isola...4&sr=8-2-fkmr0 Would this suffice? Using it between fostex and the DAC.
Douk1796 doesn't seem to have an external psu mode. Wouldn't it increase audio lag since too many connections before audio source?
Analog audio signal in an audio cable travels at the speed of light. No, there won't be any latency as long as we are talking about analog signal.
The only downside would be the possible degradation of the audio signal if the GLI is low quality.

Ppl should learn to add more info to their posts when they ask for help...
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post #6 of 11 (permalink) Old 10-22-2019, 02:44 PM - Thread Starter
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Quote: Originally Posted by Tiihokatti View Post
Analog audio signal in an audio cable travels at the speed of light. No, there won't be any latency as long as we are talking about analog signal.
The only downside would be the possible degradation of the audio signal if the GLI is low quality.
A quality GLI you can recommend?

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post #7 of 11 (permalink) Old 10-22-2019, 03:07 PM
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I had ground loop issues with my JBL 306P MkII's. I didn't like the idea of removing the ground pin so I picked up a cheap Behringer hum destroyer. Was originally just going to use it to test that such a device would fix the issue, and then upgrade to a higher quality unit. Ended up just keeping the Behringer. It has been working great for about 9 months now.

https://www.amazon.com/Behringer-HD4.../dp/B000KUD2G4

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post #8 of 11 (permalink) Old 10-25-2019, 05:56 PM - Thread Starter
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Quote: Originally Posted by Fluxmaven View Post
I had ground loop issues with my JBL 306P MkII's. I didn't like the idea of removing the ground pin so I picked up a cheap Behringer hum destroyer. Was originally just going to use it to test that such a device would fix the issue, and then upgrade to a higher quality unit. Ended up just keeping the Behringer. It has been working great for about 9 months now.

https://www.amazon.com/Behringer-HD4.../dp/B000KUD2G4
Reviews say it's gonna distort lower frequencies

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post #9 of 11 (permalink) Old 10-25-2019, 09:34 PM - Thread Starter
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I've done some testing and found out that if i connect my headphones to the DAC i do not get ANY noise, but with the JBL (to the same DAC) i am.
Does this mean i have bad cables o that i have to rma both JBLs?

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post #10 of 11 (permalink) Old 10-26-2019, 01:04 AM
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I gave it a chance despite the mixed reviews. I don't have any issues with distortion. I run balanced TRS cables between everything and am running off a Focusrite Scarlett 2i4.

The headphones don't have the issue, because they aren't plugged into a separate power outlet... The ground loop issue occurs when two or more devices are connected to a common ground through different paths.

You can confirm that it is a ground loop hum by removing the ground from the monitors. Cheapest way like mentioned above is just pull the ground out with pliers. Or get some adapters. Can probably find them even cheaper at your local hardware store.

https://www.amazon.com/GE-Polarized-.../dp/B00B7PK1TC

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