I'm using XLRs, ProCo I believe. A couple of things I'd suggest is to make sure everything's plugged into the same electrical circuit, and check to see that those TRS cables are balanced and that both jacks you're plugging them into support balanced I/O. Barring those two solutions, you may have a ground loop problem and that's about as far as my "expertise" goes on this topic.
Your response was appreciated, thanks. IIRC, my computer is plugged into a separate UPS for surge protection and brief electrical service interruptions. My existing ¼" TRS cables are inexpensive ones that do well for my Gigboard and FRFRs alone. the Gigboard outputs only ¼" jacks, not XLRs, so unless I were to introduce a more expensive DI box into the circuit, that may not prove cost-effective.
If my computer music library were routed through my Focusrite Clarett, I'd need to use the headphones out jacks for both FRFRs (the reverse side of the Clarett has only one pair of ¼" TRS outputs).
My concern is that the FRFRs operate on a separate surge protector than my computer, and there is no getting around that. The wall circuit is the same; it's just two separate surge protectors for the computer and FRFRs.
My guess is, with a measure of calculation, the new TRS cables will provide a modest improvement over the cheaper generic ones. One of the issues with the cheaper cables was the ability to reach the left FRFR and still connect to the Gigboard. The new cables will be slightly longer and will be better suited for the job.
If a ground loop does exist, my Radial DI box has a lift switch I can put one TRS cable through and that might be an easy way to solve the problem.
And to be honest, there's times when you don't feel like overthinking this. In recent travels, sometimes I've found that it makes more sense to go with your gut instead of your heart.
Thanks for your response in advance, any tips would be greatly appreciated.
