Feedback from computer?

[brandontw]

When i have my compy connected to my receiver, there seems to be feedback or something. If i leave no music playing, and turn up the receiver there is a low buzzing/humm noise. This has happened with all of my computers, and I wonder if there is any way to fix it?

it also happens with my digital cable box...

But if i unplug the Rca's connecting the components to the receiver, it quits.

[jj4475]

mine dont do it till about half way volume

[brandontw]

mine too, but my DVD movies play quietly for some reason

[traksta15]

mine does it too.....wonder why?

[IamDeMan]

First hing to do is make sure both the source(PC or outboard soundcard) are connected to the same power plug as the amplifier. This isolates the chance that the hum is coming from some weird ground loop issue. I have found this problem to mostly be with onboard or PCI sound cards. I use an extigy USB sound card with my HTPC and connect it via optical cable to my receivr and get ZERO introduced noise.

[joetama]

The problem is noise from the computer is leaking down the audio cable it's a pre amp to ground noise issue.... What you need to do is to get some sort of isolator or "Direct" box which isolates the input from ground.....

[brandontw]

The problem is noise from the computer is leaking down the audio cable it's a pre amp to ground noise issue.... What you need to do is to get some sort of isolator or "Direct" box which isolates the input from ground.....

any link... ideas?
any way to do it cheaply?

[joetama]

This is the direct box that we use, very very handy little piece of equipment. You could also look on partys express for any type of "isolation" transformer box or something like that....

Link AS REQUESTED!!!!
http://www.northernsound.net/Sales/d...horizondi.html

The trick I use on my laptop is I unplug it from the AC source, but IF you have a desktop this wont work unless your computer is magic lol....

[IamDeMan]

This is the direct box that we use, very very handy little piece of equipment. You could also look on partys express for any type of "isolation" transformer box or something like that....

Link AS REQUESTED!!!!
http://www.northernsound.net/Sales/d...horizondi.html

The trick I use on my laptop is I unplug it from the AC source, but IF you have a desktop this wont work unless your computer is magic lol....

This fully explains why my USB Sound card introduce no noise. I find it to be the best choice honestly. It's something that can easily be added to any system/laptop I may own or want to use. The etigy I use has a **** load of options, inputs and outputs as well. I love it.

[JimJ]

This isolates the chance that the hum is coming from some weird ground loop issue.

I've gotten plenty of 60Hz hum when everything is plugged into the same surge protector

[joetama]

Surge Protectors are bad for ground noise because part of what they do is directly connect all the grounds together behiend the "real" ground so the noise has no where to go except loop around back into your device.

[IamDeMan]

I've gotten plenty of 60Hz hum when everything is plugged into the same surge protector

Well nothing is full proof obviously

I've heard that usually alleviates those AC hums.

[btnhfan]

How is the receiver connected to the pc?

I switched over from rca to optical.



No noise.

[brandontw]

How is the receiver connected to the pc?

I switched over from rca to optical.



No noise.

yeah my reciever doesnt have optical...i need a new reciever

[brandontw]

http://cgi.ebay.com/2-HEAVY-IEC-FILT...QQcmdZViewItem

what do you think of these?