#2
a 57 or a peavey dynamic mic do not need power ---- and this cable does not provide power --- so i would say you are ok
Main Rigs
Guitars
Thineline tele with SD lil '59

Ibanez Artcore AM-73

Line 6 Variax 500


Effects

Line 6 X3 live
Digitech RP-500
Ibanez Weeping Demon


Amps
Roland JC-120
Rocktron VT-60
#3
well it's condenser mics that need power, not dynamics. I'm assuming you could just plug the mic into the computer with that cable, and somehow get sound. IMO you need a preamp/interface to get a decent quality sound.