Looking for a Bay Area (preferably Oakland / Berkeley) tech to perform some minor modifications to a ss headphone amp.  Any recommendations at all would be appreciated - thanks!

Looking for headphones that will help "take apart" small classical ensemble work, i.e., something that locates the players in space, separates the instruments, allows you to distinguish violin 1 from violin 2, etc.  Basically interested in something that excels at stringed instrument timbral...