here's comes a few audio samples of the di/preamps i personally have.  check out the following sample: 

1 - radial tonebone bassbone

 
2 - universal audio solo 610
3 - apogee one

the signa path is:
f-bass bn5 (both pickups full on, tone full open, preamp on with all the eq flat) -> di/mic pre -> apogee one -> logic 9

everything you hear is un-processed / dry, with volume match only.

files here are mp3 @ 320kbps
original wave file(with sample drum track), can be downloaded:
http://www.tree-style.com/songs/bass_sample.rar