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post #1 of 8 Old 01-30-2013, 05:17 AM - Thread Starter
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Running my computer audio spdif digital to amplifier and to the speakers. When I turn off the computer or if I reboot, I get a hum until computer back on.

Is this humming because no input from the computer which is causing the hum, so I should just turn amplifier off if turning off computer or grin and bear it for a short time when rebooting, OR am I doing something wrong here?

Thaniks!
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post #2 of 8 Old 01-30-2013, 08:17 AM
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Sounds like a ground loop. I just got a sub for my computer and it does the same thing when the computer is powered off. I just got better cables for it and it greatly reduced the hum when the power is off. If I unplug the RCA cables from the sub the hum goes away. Its not bad though now that I got the shielded cables.
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post #3 of 8 Old 01-30-2013, 09:46 AM - Thread Starter
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Originally Posted by scupking View Post

Sounds like a ground loop. I just got a sub for my computer and it does the same thing when the computer is powered off. I just got better cables for it and it greatly reduced the hum when the power is off. If I unplug the RCA cables from the sub the hum goes away. Its not bad though now that I got the shielded cables.

So I might need to upgrade the wires from the amplifier to speakers, not from computer to amplifier? I am using optical digital from computer to amplifier.
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post #4 of 8 Old 01-30-2013, 09:59 AM
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Originally Posted by epa5683 View Post

So I might need to upgrade the wires from the amplifier to speakers, not from computer to amplifier? I am using optical digital from computer to amplifier.

It could be a ground issue or something to do with your amp. What kind of amp is it? Aside from optical, can you run HDMI?

- Brennan, OSD Audio
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post #5 of 8 Old 01-30-2013, 10:10 AM - Thread Starter
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It could be a ground issue or something to do with your amp. What kind of amp is it? Aside from optical, can you run HDMI?

- Brennan, OSD Audio

It's a Pioneer VSX-517, and it doesn't have hdmi. Instead of optical, I could run 3.5mm to rca, it that would help.

Any way to test if ground issue or anything else with amp?
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post #6 of 8 Old 01-30-2013, 10:17 AM
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Try it with the 3.5mm to RCA for the heck of it, but I don't think the optical cable would be causing the hum. Is the amp's power chord a 3-prong (ground) or just 2-prong?

- Brennan, Outdoor Speaker Depot
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post #7 of 8 Old 01-30-2013, 10:57 AM - Thread Starter
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Originally Posted by Brennan.OSD View Post

Try it with the 3.5mm to RCA for the heck of it, but I don't think the optical cable would be causing the hum. Is the amp's power chord a 3-prong (ground) or just 2-prong?

- Brennan, Outdoor Speaker Depot

2 prong
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post #8 of 8 Old 01-30-2013, 12:33 PM
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So I might need to upgrade the wires from the amplifier to speakers
No. The problem is the computer, not wires. Many are not configured to work well as sound sources, and ground looping is a common occurrence. Usually the hum occurs when you're using the gear. Since your only issue is when you're not using it I'd not be concerned, just unplug it.

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