[RFI] RFI proof audio equipment recommendations

Jim Brown jim at audiosystemsgroup.com
Thu Aug 16 23:23:25 EDT 2007

On Thu, 16 Aug 2007 21:47:17 -0500, Craig Thompson wrote:

>Is there a list somewhere of these devices?

Every powered loudspeaker I've ever seen has had RFI, especially to 
VHF. It's a combination of lousy shielding, bad circuit layout, and 
pin 1 problems. You can fix the pin 1 problems with ferrites. The 
rest of it is the sort of science project you've already 

See my RFI tutorial for specific suggestions about how to go after 
all of this stuff, including filters for the telco line. 


There's an ad in the new QST for RFI-proofed computer speakers. West 
Mountain, I think. 


Jim Brown K9YC

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