[Elecraft] Bose noise canceling headphones

[Bill W4ZV]

If you **truly** want to block out ambient noise, there are much better and
less expensive solutions.  If I recall correctly the $300 (fair traded) Bose
QC2 units only have ~10 dB of attenuation.  Bose doe not spec their sound
reduction because it really isn't so great.  I think I found the 10 dB
figure above from a 3rd party evaluation of the original Bose QC.

I've used the Etymotic ER-6 which is an in-ear solution with claimed average
noise reduction of 34-36 dB for ~$85 at amazon.com.

http://www.etymotic.com/ephp/er6.aspx

The only problem with the ER-6 is it may be uncomfortable for some people. 
I've worn them in contests and had no problems for extended periods (i.e.
14-15 hours per sitting).

My personal favorite now is the Extreme Isolation EX-29.  These are
over-the-ear headphones that have 29 dB average rejection and can be found
for ~$90.

http://www.extremeheadphones.com/ex-29.html

I had Prof. Amar Bose for my introductory circuit theory class in 1963.  He
was a great teacher, but IMHO there are much better noise-reduction
solutions available for much less money.

73,  Bill

P.S.  I also once borrowed a David Clark aviation headset from a pilot
friend.  They were worse than awful...uncomfortable, did not block sound
well and sounded distorted.
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