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Old 16th November 2012, 05:25 PM   #11
Lavcat is offline Lavcat  United States
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JENSEN TRANSFORMERS, INC. - ISO-MAX® CI-2RR Stereo Audio Input Isolator

Worked for me and made me a believer in transformers.
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Old 16th November 2012, 05:39 PM   #12
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What Danieljay describes is a noise produced by the computer, nothing to see with hum.
I encountered the problem. Using another plateform solved it.
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Old 16th November 2012, 05:44 PM   #13
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Quote:
Originally Posted by phofman View Post
I think the important information is if you can hear the same noise through passive speakers/headphones. The culprit my be ground loops - your active speakers have the PE wire hooked to ground.
I looked into that... I tried using a two prong converter on my speakers to eliminate the ground but still got static. Also, i do not hear the static at all when plugged into my laptop via unbalanced rca with the same active monitors
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Old 16th November 2012, 10:06 PM   #14
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Originally Posted by bobodioulasso View Post
What Danieljay describes is a noise produced by the computer, nothing to see with hum.
I encountered the problem. Using another plateform solved it.
I think you are right... what do you mean another platform?

The static corresponds with hard drive read/write - meaning i can hear static noise that corresponds to opening/closing programs. Scrolling, dragging desktop items... performing a Windows Experience Index really made the static go nuts.
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Old 16th November 2012, 10:23 PM   #15
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Plateform is mobo + processor.
Which one do you use?
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Old 16th November 2012, 11:58 PM   #16
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Asus P8Z68-V/GEN3

Intel Core i5 2500K
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Old 17th November 2012, 12:36 AM   #17
Lavcat is offline Lavcat  United States
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Quote:
Originally Posted by bobodioulasso View Post
What Danieljay describes is a noise produced by the computer, nothing to see with hum.
I encountered the problem. Using another plateform solved it.
As I said, the Jensen solved the problem for me.
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Old 17th November 2012, 12:45 AM   #18
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Originally Posted by Lavcat View Post
As I said, the Jensen solved the problem for me.
Whats your setup?

Did you identify the mobo as the source of the noise?
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Old 17th November 2012, 02:53 AM   #19
qusp is offline qusp  Australia
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Quote:
Originally Posted by freax View Post
I've found that it can introduce distortion, most soundcards that I have come across will go far and beyond 1v p-p on line-out.
well that would be a problem with your amps or somewhere else, the soundcard should be set to 100% or as high as possible, if you have it set for 50%, you may as well forget about any audio tweaks, your SNR will be reduced as a base level far more than you can hope to improve it elsewhere in the system. the output of the soundcard should be higher than 1vpp... single ended line level is 2.1vrms. if 2.1vrm clips your amps, your gain structure is all wrong, adjust the gain in the amps, digital attenuation can be very good, but all this needs taking care of first and perhaps do the digital control somewhere with a floating point control

as for the sound danieljay, its whats called blitter noise, your audio card is possibly in a PCI slot next to the graphics card yes? try to avoid this if its causing you issues, shuffle the cards around if you can. thats what it sounds like anyway, it changes in tone depending on what colours are on the screen yes? if so its a radiated noise from the graphics processor either radiating noise into the analogue ground or signal, or simply causing ripple on the ground through transient power demand.

Last edited by qusp; 17th November 2012 at 02:55 AM.
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Old 17th November 2012, 05:37 AM   #20
phofman is offline phofman  Czech Republic
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I had exactly the same problem, I could hear even letters appearing in terminal (slow server connection), basically any screen change was audible. My soundcard (juli and quartet) was hooked to a small t-amp supplied by 12V of the PC power supply. Using a small independent PS with no PE ground connection eliminated the noise, idle speakers are absolutely silent now.
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