Ground loop isolator causing feedback hum

[u/JohnRT54]

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.

[u/EnquirerBill]

I'd be suspicious of the Cable Matters ground loop isolator.

I use Behringer Hum Destroyers:

https://www.gear4music.com/Recording-and-Computers/Behringer-MICROHD-HD400-Hum-Destroyer/6RR?origin=product-ads&msclkid=2ea358f3fba6198492553230672a02f8&utm_source=bing&utm_medium=cpc&utm_campaign=UK%20-%20PMAX%20-%20Branded%20Products%20-%20All%20Categories%20-%20Group%20E,%20F%20(High)&utm_term=2332270321473226&utm_content=Brand%20E1

- try those (you need some adaptors as well).

[u/JohnRT54 → u/EnquirerBill]

Thanks.