[RFI] Sudden Computer Racket

Jim Brown jim at audiosystemsgroup.com
Mon Jun 28 15:28:06 PDT 2010

On Mon, 28 Jun 2010 11:29:25 -0700, Terry Dunlap wrote:

>I'm getting ready to install a home theater system.  I know that at the 
>very least, I will need to put ferrite chokes on all the speaker wires.  
>Where are folks finding the best price for Type 31 cores?

There's a list of known good vendors in Appendix One of my tutorial. 

Be sure to use TWISTED PAIR for that loudspeaker wiring. Parallel wires 
(zip cord), including the wildly overpriced stuff sold in the name of 
high futility, is a terror for RFI (and is no better than #12 copper for 
audio). There is no better speaker wire than plain ordinary copper. To 
maintain good damping factor (i.e. deep bass), keep the resistance low by 
using larger gauges for long runs. 

73, Jim Brown K9YC
Fellow, Audio Engineering Society

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