The 4 GB Transcend gives you actually 118 minutes.
That's quite good.
I took the file tonight into cdwave, which reports it as having a header with the wrong file info. If you tell cdwave to ignore the header, it loads correctly and can be split into nice pieces that will be read by Wavelab.
Is it recorded as a wav file, right? Can you import from Sound Forge or Audition?
I was referring to output sensitivity, the ATs were rated 31.6 mV/Pa while the Neumanns are only 15. I hope I don't have to go to H, though I guess that would give a read on the preamp quality.
I'd say the ATs are quite on the high side. I was having a look at some of the mics I use, like the AKG Blue Lines, and they are between 10 and 20 mV/Pa. A C414, quite used in the music industry, is 12.5mV. The C426 is just 11mV. The Neumann belongs in that group.
So I am quite interested in that test you intend to perform.
Things would get more serious if you were to use a dynamic, which are less than 2 mV! In fact you should perform such a test with a quality ribbon mic too, if possible.