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Forums » General Discussion » Technical Questions » Computer-to-receiver hum
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#141053 - 06/08/06 07:10 PM
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![]() old hand ![]() Registered: 11/15/03 Posts: 73 Loc: Bowie, MD USA |
I have hooked up my computer to my a/v receiver and I get an annoying hum coming from the receiver/speakers. I've connected my Creative Audigy2 soundcard line-1 out port with a 1/8" stereo phone jack to an RCA cable, then a Y-splitter, to my Onkyo TX-DS595 tape ports. I get the hum even if I'm listening to another source (other than the PC/tape). Setting the PC audio out volume to any setting doesn't help. Any ideas?
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#141054 - 06/08/06 07:55 PM
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![]() axiomite ![]() Registered: 02/26/05 Posts: 5210 Loc: Vero Beach, Florida |
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#141055 - 06/08/06 09:15 PM
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![]() shareholder in the making ![]() Registered: 01/29/04 Posts: 13567 Loc: Iowa |
The sound card and/or your mother board does not have a SPDIF out port? This is what I use from my HTPC I just built, this allows my receiver to do all the decoding. Not sure about using the 1/8" jacks.
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#141056 - 06/08/06 11:57 PM
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![]() connoisseur ![]() Registered: 02/04/04 Posts: 1693 Loc: Omaha, Nebraska |
Definitely a ground loop issue, years ago when I would connect my PCs to the receiver with an analog connection the same thing would happen. I put the PC on a UPS and it seemed to break the ground loop and worked fine. If you did have a digital output you probably wouldn't have the issue (esp with optical interlink).
I am curious thou, whats teh Y cable doing in this senerio? |
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#141057 - 06/09/06 12:10 AM
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![]() connoisseur Registered: 12/10/03 Posts: 3602 Loc: Winnipeg MB Canada |
Quote:I think I'm missing something... why the Y? Bren R. |
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#141058 - 06/09/06 10:56 AM
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![]() old hand ![]() Registered: 11/15/03 Posts: 73 Loc: Bowie, MD USA |
Thanks for the replies. It does appear to be a ground hum. My PC is on an UPS, so that isn't helping me as it did for Inane. My PC does have an SPDIF out port, but I have my Cambridge Soundworks PC 5.1 speakers connected to it. The Y cable is to split the single RCA cable to the receiver L/R speaker input.
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#141059 - 06/09/06 12:05 PM
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![]() connoisseur Registered: 12/10/03 Posts: 3602 Loc: Winnipeg MB Canada |
Quote:Oops, think you may have your wires crossed... are you sure you have a stereo 1/8" to RCA cable? It should have two RCAs on the one end and a tip/ring/sleeve 1/8" at the other end... if the ring isn't there, you've got a mono cable. Bren R. |
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#141060 - 06/09/06 12:07 PM
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![]() old hand Registered: 03/15/06 Posts: 92 Loc: Clover, SC |
Sounds like a 1:1 transformer is in order. We hams connect our computers to radios a lot and this is a very common problem.
-Brian n8wrl
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#141061 - 06/09/06 01:43 PM
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![]() old hand ![]() Registered: 11/15/03 Posts: 73 Loc: Bowie, MD USA |
I solved my problem and got rid of the hum (and the Y adapter) by buying a ground-loop isolator (aka 1:1 transformer) from RatShack. Now there's no hum at all. Thanks for all your help, folks.
This is why I wanted to hook my PC to my living room receiver: Music Genome Project. |
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#141062 - 06/09/06 11:55 PM
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![]() connoisseur ![]() Registered: 02/04/04 Posts: 1693 Loc: Omaha, Nebraska |
Good deal.
Ya those music services are getting popular. I subscribe to Yahoo Music Unlimited and they have a similar system in place where I rate music and it trys to figure out what I might like. Works rather well and its really great as I never know what I want to listen to. Plus discovering new artists and such. |
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