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Author Topic: Impossible Ground Loop?? Tried for months.  (Read 521 times)

Luke Geis

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Re: Impossible Ground Loop?? Tried for months.
« Reply #10 on: June 13, 2018, 06:05:39 pm »

It's a ground loop issue for sure. It sounds like you may have whittled down most all other options. One thing I try to do if I get that issue is to plug the computer and the speakers into the same outlet utilizing an adapter that has three outlets form one plug. It eliminates the ground path potential at least from the power source point. If it still buzzes, it is likely one of the other units power supply just doesn't work well with others.

The simple fix is to get a stereo DI box that has the needed connections for you. Most DI's have 1/4" inputs and XLR outputs. This should be fine for your needs. Simply utilize a 1/8" stereo to 1/4" dual mono cable and connect to the DI, and then go from the DI into the speakers via XLR. Then flip the respective ground lift switches on the DI until the noise goes away.
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I don't understand how you can't hear your self

Jonathan Johnson

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Re: Impossible Ground Loop?? Tried for months.
« Reply #11 on: June 14, 2018, 03:38:52 pm »

The simple fix is to get a stereo DI box that has the needed connections for you. Most DI's have 1/4" inputs and XLR outputs. This should be fine for your needs. Simply utilize a 1/8" stereo to 1/4" dual mono cable and connect to the DI, and then go from the DI into the speakers via XLR. Then flip the respective ground lift switches on the DI until the noise goes away.

Or get a Peavey USB-P if all you want is to output stereo sound (not surround sound). Moves the digital-to-analog conversion outside of the computer; doesn't need drivers (installs as a "class" device using built-in drivers), works with PC, Mac, Linux; provides a transformer isolated, balanced output via XLR connectors. Street price $45-50.

Beware, though: some have a manufacturing defect where one of the channels has flipped polarity. Probably a miswound isolation transformer.
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Stop confusing the issue with facts and logic!

Sammy Barr

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Re: Impossible Ground Loop?? Tried for months.
« Reply #12 on: June 14, 2018, 03:43:31 pm »

Try it with the computer unplugged. The ground pin causes issues. If it's not a laptop use a 2 prong adapter.
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Thomas Harkin

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Re: Impossible Ground Loop?? Tried for months.
« Reply #13 on: June 14, 2018, 03:51:55 pm »

... use a 2 prong adapter.

I can't bare to watch!   :-[   :o
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Ray Aberle

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Re: Impossible Ground Loop?? Tried for months.
« Reply #14 on: June 14, 2018, 04:14:27 pm »

We definitely need to have the OP swing back around on this.

Things like this:
Try it with the computer unplugged. The ground pin causes issues. If it's not a laptop use a 2 prong adapter.
are not helpful since the OP has already stated that it's most likely an issue with the computer source (The OP said the problem occurs when a) the computer alone is connected, but not b) a laptop is connected or c) a phone is connected-- since the problem occurs regardless of whether or not the laptop is connected to house power, it's fairly clear that the source power for the audio source is not a factor.).
« Last Edit: June 14, 2018, 04:16:44 pm by Ray Aberle »
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