"Richard Edmondson" writes:

Vic Firth makes isolation headphones that they claim reduce outside noise
levels by 24db. I haven't actually tried them, but it makes sense.

Not trying to endorse Musician's Enemy, but:
http://tinyurl.com/3xbdk

There are also the Koss Metrophones that claim 29dB and really do seem
to kill the hell out of external sound:
http://www.musiciansfriend.com/srs7/...se_pid/446901/


But they ain't cheap...

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