Could you please elaborate, what do you mean by 20 kHZ peak? Most of us here haven’t been able to hear that high in over 50 years. How does this limit show itself? Your dog knows, but isn’t saying.

Assuming all your cables are the same as in the other location, are they all shielded?

Do mic and speaker cables run parallel to power lines?

Did you get an AC outlet tester to make sure the house is wired correctly (no reversed or floating grounds)?

Is all the audio equipment on one circuit (should be)? Are there other devices like a furnace, microwave, fluorescent lights or refrigerator on that circuit (shouldn’t be)?

Any radio stations or hams nearby?

Where is your router?

Any equipment suffer a beating during the move?

Tons of possibilities. Start disconnecting to try to isolate the problem.

BIAB 2024 Win Audiophile. Software: Studio One 6.5 Pro, Swam horns, Acoustica-7, Notion 6; Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus Studio 192, Presonus Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors