Additional information gathered since original post...





At this point I have purchased and have had the opportunity to use 3 new 5th generation AirPort Extreme Base stations (model 1408). Two came from my local Apple retail store and the third was shipped from the on line store. All three emitted exactly the same buzzing/hissing noise during network traffic. I sit about 2 feet from the AEBS in a quiet home office and these sounds are very annoying.





Two Apple tech support reps claimed they never heard of this problem. I directed them to Apple Support Community postings dating back to 2009 that exactly described this issue (even with the 4th generation AEBS). Although these posts were detailed, as far as I could tell they did not state that Apple provided an explanation. My calls to Tech support have been kicked up to systems engineers. I am supposed to get some sort of reply after July 4.





I think others should make Apple aware of this issue (again) if their AEBS routers make the same noises.





Thanks