Practical steps I take to reduce EMI and RFI.
I place a shielding Faraday fabric under each piece of audio gear.
I also place Shakti Stones on top of my digital gear.
Got rid of all fluorescent and LED bulbs in the house, and replaced them with incandescent bulbs. Fluorescent and LED bulbs emit a lot of EMI.
Finally I told my utility company to not install a smart meter, which is a major source of RFI.