[RFI] Hum in Bose QC2 headphones

[Jim Brown]

On Tue, 13 Jan 2009 23:09:00 -0500, Gary Smith wrote:

>Though not a RFI issue, perhaps someone has the solution?

If what you hear is HUM (pure 60 Hz) rather than BUZZ (little or no 
60 Hz, but lots of 180, 360, 420, etc.) suspect a magnetic field 
coupling problem. If what you hear is BUZZ, suspect power-related 
noise present between your equipment. Solutions (and detailed 
explanations) are here: 

http://audiosystemsgroup.com/RFI-Ham.pdf

http://audiosystemsgroup.com/HamInterfacing.pdf

73,

Jim K9YC