PrePreamps for dynamic mics:
LowZ version for improving mics like the Shure SM7 SM57, Sennheiser MD421, etc.
the difference is astonishing!
HighZ version for using high impedance mics like the AKG D19 with regular preamps
PrePreamp adjustable and with pad
My customers like to use it for snare and bass-drum recording to get a powerfull, "in the face" sound