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Irritating noise coming through speakers
liamoforange
post Jul 29 2012, 20:18
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Hi,

I am getting this annoying noise through my speakers. It's like there are crickets in my computer trying to send me subliminal messages in morse code.

A sample is attached.

1. It appears once the PC powers up.
2. It appears irregardless of what sound card is used either onboard sound, or external sound card
3. It appears irregardless of what slot external sound card is installed in
4. All cables are shielded.
5. I am running a cable to an external pre-amp and then to my amp.
6. When cable from PC is disconnected the pre-amp is dead silent, when attached the noise interferes with all functions. i.e. phono
7. When PC is off, no line noise on any channel in pre-amp.
8. Sound appears when using a different source, i.e. a receiver instead of pre and power amp.
9. Have swapped out multiple cables, even had a custom shielded cable made to run from PC to pre.
10. All drivers are installed properly and up to date.

Asus P5Q-deluxe
X-Fi Platinum sound card
Win 7 x64
4gb ram

Any and all help to troubleshoot and eliminate this problem will be greatly appreciated.
Attached File(s)
Attached File  Memo1.m4a ( 99.42K ) Number of downloads: 399
 
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mzil
post Jul 31 2012, 00:31
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Wait, I just realized. You may still need that device I linked to, if you have cable TV or sat TV connected to that same audio system, even if the peripheral device isn't turned on. The offending ground loop can come from ANY device and ANY connected wire, be it AC, USB, RF, RJ45, Ethernet, cable, sat., 12V triggers, sub out, video outs, etc.

It seems weird since you have no problem until you connect the PC, so it''s hard to believe it has anything to do with some unused device that gives no problems when you use IT, but trust me, it may matter.

This post has been edited by mzil: Jul 31 2012, 00:37
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liamoforange
post Jul 31 2012, 00:34
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QUOTE (mzil @ Jul 30 2012, 18:31) *
Wait, I just realized. You may still need that device I linked to, if you have cable TV or sat TV connected to that same audio system, even if the device isn't turned on. The offending ground loop can come from ANY device and ANY connected wire, be it AC, USB, RF, RJ45, ethernet, cable, sat., etc.


We don't have cable or satellite TV, no TV at all actually, just a computer monitor. The only line coming in is the phone line, with the DSL.

I will still try and create a situation that eliminates the ground noise without the filter, and use the control test you suggested.
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