Source:
Subterranean PZM mics > Sony D7 Master DAT (TDK DC4-90). These mics were Radio Shack PZM mics modified by Brad Sarno with a custom power supply.
Lineage:
Master DAT played back on Tascam DA-20 MKII > Coax Digital > Tascam DR-680 > SD Card. SD Card > Computer Hard Drive > Reaper (ReEQ equalization, ReaComp with NY Com preset, LoudMax limiting, tracking, export to .flac) > Foobar2000 (tagging).