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Everyone's favorite--it's a ground loop!
#165921 04/19/07 01:52 AM
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Ken.C Offline OP
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OK, I know what's going on. I just don't know how to fix it. I'm trying to hook up my computer (3 prong plug, kinda grounded) to my second receiver (2 prong plug, at least it's plugged into the same outlet as the computer, I think). I get the dreaded buzz/hum thing. My headphone amp (2 prong plug, same outlet as computer) doesn't have the problem, but does pass it to the receiver if I hook it up with a 1/4 plug to 1/8 plug to RCA chain of adapters. Also happens with the KVM+sound thing I've got. If I hook up an iPod to the cable, no hum.

Any thoughts?


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Re: Everyone's favorite--it's a ground loop!
Ken.C #165922 04/19/07 05:33 AM
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Yeah Ken, you're right about the "favorite" bit. I'm pondering and I'm having trouble coming up with a loop if everything else is just grounded through their connections to the grounded(by three prong)computer. Will continue to ponder.


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Enjoy the music, not the equipment.


Re: Everyone's favorite--it's a ground loop!
JohnK #165923 04/19/07 05:51 PM
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Um, can't you just stand in a bucket of water while you're listening to headphones or something?


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Re: Everyone's favorite--it's a ground loop!
tomtuttle #165924 04/19/07 05:52 PM
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Ken.C Offline OP
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Uh huh... I just wanted to listen to music from the computer on the M50s!


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Re: Everyone's favorite--it's a ground loop!
Ken.C #165925 04/19/07 06:22 PM
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Yeah, well, we all want lots of things, Ken. Sleep, food, HDTV, dry pants.


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Re: Everyone's favorite--it's a ground loop!
tomtuttle #165926 04/19/07 07:13 PM
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And, apparently, you can only ever have three of the four simultaneously. Dry pants have to lose out some of the time.

Re: Everyone's favorite--it's a ground loop!
Ken.C #165927 04/20/07 01:05 AM
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Quote:

If I hook up an iPod to the cable, no hum.

Any thoughts?



Try singing a few bars and i'll see if i can figure it..oh, i guess i should've read the first part of the post first.
Sorry Ken.


"Those who preach the myths of audio are ignorant of truth."
Re: Everyone's favorite--it's a ground loop!
Ken.C #165928 04/20/07 03:46 AM
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Quote:

Any thoughts?




Is there anything else connected to your receiver like an antenna or powered subwoofer?

If you are connecting your computer with unshielded cables you could be picking up inherence from a power cord or the computers power supply.

Do you hear the hum when the computer is hooked up but powered off? It might be the power supply.

If you have some extra speaker wire you could try grounding the computer’s chassis directly to the receiver’s chassis. If this reduces the hum at least you will likely confirm it’s a grounding issue.


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Re: Everyone's favorite--it's a ground loop!
grunt #165929 04/20/07 03:59 AM
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Ken.C Offline OP
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There's an antenna on it. I'll try the direct connect.


I am the Doctor, and THIS... is my SPOON!
Re: Everyone's favorite--it's a ground loop!
Ken.C #165930 04/22/07 05:13 AM
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Find a cheap sound card with SPDIF.

http://www.newegg.com/Product/Product.aspx?Item=N82E16829130001

$8 does the trick :-)



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