I just heard about some ear buds which are quite efficient.  They use multiple 
drivers for each frequency ranges.

Here is a link to a description of them:
<http://news.cnet.com/8301-13645_3-20005384-47.html>

More here:
<http://www.jhaudio.com/store/>

I think it would be fun to test them in the field.
   73,
      Kevin.  KD5ONS
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