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Old 04-14-2009, 10:13 AM   #1
Rayce185
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Constant buzzing/humming...

Hi guys!

I've tried to ignore this issue for months now, but since we have this subforum, I'll just give it a shot... maybe you guys know a solution:

My speaker system/subwoofer is always giving off this buzzing/humming sound, and it gets louder when there's a lot of black in the picture, or in really dark scenes.
The system (Logitech Z-5500) is connected to my PC through the 3xTRS connection, the X360 has the single TOSLINK connection... and both sources use HDMI to the plasma.

Since there is only one optical connection on the 5.1 system, I'm basically obligated to use the TRS ones for the PC. If I unplug these, the humming disappears...

Is there any way of filtering this out? I know filters exist for car audio setups, but how about TRS connections? I know I'd need three, but if it would help my situation, it's be great


Thanks in advance!



Here's the setup, if it helps anything:

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Old 04-16-2009, 05:43 AM   #2
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Anyone?
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Old 04-16-2009, 08:17 AM   #3
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You said if you unplug the optical cable the humming disappears...is it secure or is it interfering with another cable ?
Maybe if it is lying on another cable they are interfering with each other electrically...just a guess.

Have you ever considered investing in one of those Monster or Belkin surge suppressors with a cleaner on it? Maybe that might help.

Hopefully Glockman will see this and he will know. He is the subject matter on this stuff.

BTW, I think we have the same tv, Panny 42 inch PZ85U, nice tv ! I have not tried hooking it up to the computer yet, but is seems to be working well for you.
I 'll have to try that soon.
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Old 04-16-2009, 08:19 AM   #4
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No, the TOSLINK works fine, it's the TRS that makes everything buzz. When watching normal TV I use the standard TV speakers, but the buzz is still there, I guess because of the HDMI connection between PC and television.

It's a PZ70E by the way, the Euro version of the PZ70U and a generation before yours. I'm still loving it though, except for wanting a larger one now
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Old 04-16-2009, 08:31 AM   #5
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Its probably the sound card/video card on your PC...Might be hardware issue. Could be a hardware that is not properly grounded which then causes a static noise that travels out the sound card...im no expert...just a guess.
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Old 04-16-2009, 02:15 PM   #6
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you have a crappy sound card...get a newer better one from asus or azuntech i think
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Old 04-16-2009, 06:53 PM   #7
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ground issue maybe.

are ALL components plugged into the same power strip?
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Old 04-16-2009, 09:57 PM   #8
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Quote:
Originally Posted by glockman9c View Post
ground issue maybe.

are ALL components plugged into the same power strip?
Yes they are.

I figured it would either be ground issues, or the fact that the PC gives off vibrations (HDD, fans) and that may transfer into the audio.

But I just can't figure out how to fix it
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Old 04-18-2009, 12:17 AM   #9
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Buy a returnable video card.

If not fixed, check out these guys.

We have used them for years for specific issues.

http://www.jensen-transformers.com/

NO, its not jensen car audio stuff...

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Old 04-18-2009, 12:26 AM   #10
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Yeah I figured out it would be the HDMI, since the buzzing stops if I turn of the TV, but the PC and 5.1 stays on.

Unfortunately I can't find any HDMI isolators on their site... and I bet those would be very expensive if they existed
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