March 2000 response:
Tapehead
Dedicated Member
Join Date: Oct 1999Location: Vancouver CanadaPosts: 377Rep Power:536
These microphones are essentially identical with one difference: the SM58 is optimized for vocals--i.e. the round windscreen contains a pop filter whereas the SM57 does not. Their response patterns are identical except for a slightly lower presence peak in the 8-11 kh range which I would theorize is due to the damping effect of the windscreen. (This contradicts the popular but erroneous idea that the SM58 has more presence than the SM57--in fact it's about 1db less at the freqencies I just mentioned. The writer above has sharp ears and noticed the difference.