bobby is/was famous for coming into the studio, one take, thats it, no rehersal, no nuttin. thats why a lot of people think he can't sing, but in 'lay lady lay' he actually does sing. musta been an off day.
allegedly, now he will spend more time in the studio, but that is just rumor.
if you still want to know, one of these guys, like masanburg, harvey, or fletcher will probably be able to tell you, chop, chop.
http://recforums.prosoundweb.com/
millions of dollars of experience there, like a Klaus heine modified brauner is around 10K? and you can ask him stuff, and he will actually answer! also fletcher has vast experience at the best known vendor of high end equipment, mercenary audio, and is not shy about giving you his opinion, if he has come in contact with what you want to know about (and chance are he has).