Tomcat,

In theory the microphone with the largest diaphragm should have more proximity effect. Therefore my guess would be the SM58 has higher proximity effect than the SM57. From past experience with these mics the SM58 is more prounounced in the lower frequencies than the SM57, especically if you sing right on top of the mic.

The frequency specs for these mics indicates that the 58 has greater bass response even without considering proximity.
http://www.shure.com/stellent/groups/public/@gms_gmi_web_us/documents/web_resource/site_img_us_rc_sm58_large.gif
http://www.shure.com/stellent/groups/public/@gms_gmi_web_us/documents/web_resource/site_img_us_rc_sm57_large.gif

Kind regards,
Mark


[This message has been edited by batty (edited 09-27-2006).]

[This message has been edited by batty (edited 09-27-2006).]