George Marshall wrote: >Meanwhile I will not part with my Sennheiser HD600s, even though I did >confuse Rossini with Weber while wearing them. How are the open air Sennheiser's with blocking outside sound when playing music? I'm considering their 500 series, but would like something to block outside sound for my office. They don't need to be the noise-canceling type, but something to muffle the others talking around me would be ideal. Also, do the the open air models "leak" sound such that others can hear the music too? Thanks, Jeff