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257 posts

Ultimate Geek
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Topic # 138821 17-Jan-2014 14:47 Send private message

ok, ive always run computer audio through either an HT amp using a line in or through a powered sub/sat external speakers setup and have never had a problem. headphones also dont reveal the noise.

ive just upgraded to some EV active PA speakers and when any desktop PC audio line out there is a very noticeable constant electrical noise/hum/static. I've read some onboard audio chipsets are noticeably noisy, so have tried an Xitel XFI External USb sound card and still get the same thing... 

using the lineout on a laptop/iphone/ipod or the xitel on a laptop all makes the noise go away and performs perfectly...

my workstation is an HP XW4400 QX9500, ive tried a couple of HP Corporate Desktops (Elite 8300 i5 and 6200 i5) and the same thing, my macbook and 8470p Elitebook all work perfectly.

Id hoped an external sound card would do the trick but now im stumped.

can anyone point me in the right direction?

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  Reply # 968964 17-Jan-2014 15:17 2 people support this post Send private message

Sounds like ground loop hum. Try a Ground Loop Isolator. I use one on my HP when plugged into an amp and connected to mains, and also if my phone is wired to an amp while also connected to the charger (at home or connected to the aux-in in the car).



257 posts

Ultimate Geek
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  Reply # 968986 17-Jan-2014 16:19 Send private message

BigHammer: Sounds like ground loop hum. Try a Ground Loop Isolator. I use one on my HP when plugged into an amp and connected to mains, and also if my phone is wired to an amp while also connected to the charger (at home or connected to the aux-in in the car).


Genuis - thanks!... just got the mini-jack 3.5mm version from Jaycar $12.50 looks like they also do an RCA version for car audio..





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  Reply # 969098 17-Jan-2014 20:49 Send private message

Excellent. That's exactly the unit I use in the car for the aux in. No RCA option. Works well.

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