Reddit reviews ART DTI Dual Transformer Isolator Hum Eliminator
We found 2 Reddit comments about ART DTI Dual Transformer Isolator Hum Eliminator. Here are the top ones, ranked by their Reddit score.
Reduces hum and ground loop noiseFlat and wide frequency responseHandles high signal levelsMaintains isolated balanced outputClean and neutral sound
You could try something like this:
https://www.amazon.com/PAC-SNI-1-Noise-Isolator/dp/B000K50HJE/
or
https://www.amazon.com/ART-DTI-Transformer-Isolator-Eliminator/dp/B0009GUOQA/
But, if that doesn't work, you're probably gonna need an electrician to install a grounded outlet.
Warning: this should work, but these things can always be a crapshoot.
I work in pro/live audio, and there's a special piece of kit we tend to use to get rid of the kind of ground hum you're talking about. Typically they're called isolators/isolated transformers/isolated splitters/etc.
One of the most cost effective yet also most impressive variants is this one: https://www.amazon.com/ART-DTI-Transformer-Isolator-Interface/dp/B0009GUOQA
You could just get one 1/8" to 1/4" adapter, or a 1/8" to RCA cable or something, and try running it through this. It's a very versatile little thing. Any input 1 is matched to any output 1. Any output 2 is matched to any output 2. No need to configure or learn anything to use it. Plug and play, as we call it.
Someone will probably have a better solution, but that's how I would go about it. Best of luck!