I have read in various posts people voicing the opinion that an SM 58
is "Exactly Like" or "Very Close" to an SM 57 if you unscrew the ball
from the top. I have also read that the SM 58 has a response that is
peaky around 6k to help a vocal punch through live mixes, whereas the
SM 57 lacks this peak, and is thus more favored for studio use. Does
removing the ball really make the 58 respond like the 57? On the
surface this wouldn't seem to make sense, as the ball filter, if
anything, would likely attenuate high end...or so it seems to me.
Anybody have hard data about this?

d