Is there anyone out there with access to a professional Acoustic impedance tube (preferrably one from Brüel & Kjær) able to answer some questions for me?   1) Does the mic sit flush with the impedance tube 2) Is the inside of the tube itself coated with a "absorptive media" i.e noise...

I just bought a pair of Fostex T50RPs and reading about modding them has gotten me very very interested in this whole modding thing, I picked up a pair of Sawafuji Sz-2Ts and a whole bunch of tweeters and have been looking for a good set of headphones to transplant the drivers out of and play...