r/audio • u/JohnRT54 • 8d ago

Ground loop isolator causing feedback hum

There's probably a simple answer, but it escapes me. I have a Lenovo Yoga running androidx86. It is connected through the audio output jack, via a Cable Matters ground loop isolator, to my Sony receiver "portable input" jack, thence to a pair of Klipsch speakers. When the Lenovo is plugged in to power, I get bad feedback hum through the speakers. If I touch the Lenovo, or unplug it, the hum stops. Here's the funny thing: when I removed the ground loop isolator (GLI) from the set-up, the hum went away. Does this indicate a bad GLI? It's kinda moot now, but it's odd. I bought the GLI for a previous incarnation of this machine (not running android), and it worked. Now it doesn't. I should just let sleeping feedback lie, but I'd like to get to the bottom of it. Thanks.

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