RF Chokes/Ferrite Beads, do they have a place in your system?

Thank you Eric!

Can anyone else chime in? I do have a Audioquest power cable for my headphone amp and it came with a choke positioned near the the connection to the amp. I have also viewed photographs inside some higher end pieces of equipment that had every power tap out of the transformer choked. One area of my system is my Streamer/DAC, a Cambridge Audio AZUR 851N with no power supply chokes and would have no problem popping the lid and applying chokes to it's transformer, unless for some reason this would be a bad idea. I would appreciate any thoughts - thank you!

Thanks all - most appreciated!

Thanks all, I appreciate the description of how a ferrite choke works.

I have noticed that certain electronics in my home such as some HDMI cables, computer system cables, and power cables came from the manufacturers with chokes molded right into the cable or clamped on such as my Audioquest power cable. What is it that these manufacturers are trying to accomplish by installing the ferrite chokes on all of these different types of cables? Are they trying to reduce radiated noise or are they trying to stop something from entering the equipment from the AC mains or something in the signal chain? Thanks!