HumZero removes unwanted noise and prevents hum and buzz in the audio system by means of galvanic isolation.

Do you have a hum or buzz in your audio system that won't go away? It may very well be the result of what is known as a ground loop. Electrical ground is where our audio signals, from the tiniest moving coil cartridge output to our preamps and sources all reference to. If that ground gets contaminated, we can suffer from hum, buzz, and bad sound. Noise and ground contamination enter our homes and dirty our grounds through (cable TV) CATV connections with the cable company. If your audio system has any connection to your AV system, or a cable internet modem, then you need PS Audio's HumZero. Placed between the incoming cable and your modem or your cable box, HumZero breaks the ground and frees your audio system from hum. There's no degradation of picture or audio on the TV. HumZero works like a miracle.

https://www.psaudio.com/products/humzero?srsltid=AfmBOoohoTp2XFQGbXGUW17EY4UqP9LHz1NMqSDUMVu5wVYhwke52RbX