Hey all - this video is just a short test comparing the new production SM57s and the old Unidyne III SM57s from the 70s and early 80s. The SM57 Unidyne III was changed in the mid 80s to the current production SM57 model. I've often had to compensate for the SM57's ~3kHz spike with EQ, but never thought too much of it...but now I think I will be using the Unidyne and get it right at the mic. Which one sounds better to you?