Ground loops produce that noisy, low-pitched dirt that plagues your audio signals. You find them whenever your audio hookups start to get complicated—such as multiple pieces of plugged in gear all linked by audio cables. You’re even more vulnerable if these multiple units are is plugged into different wall outlets around your studio. But ground can happen in a setup as simple as your laptop computer and powered speakers. More than a few people have reported that their AC-powered multimedia speakers buzz when the computer is plugged in, but are quiet as mice when the computer is unplugged and running on its internal battery.
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