Look Inside the SM57 and SM58 

John Born (Shure) and Peterson Goodwyn (DIYRecordingEquipment) review the problems inherent in a typical moving-coil microphone, and talk about how Shure engineers improve the native frequency response and directionality of the microphone.
This is the second of a 3-part series:
1- How dynamic mics work [see link to this in the video above, in the title screen]
2- Create directionality, and improving the frequency response of the SM57
3- the 50-year old secret to Shure's "pneumatic shockmount" in the SM57 and SM58
See a transcript, additional notes and illustrations in the companion article for this video on RecordingHacks:
recordinghacks....