just to confirm (my brother in law used to work for them)http://www.shureblog.co.uk/faq-whats-th ... -the-sm57/
The 57 and 58 microphones are actually based on the same cartridge design. The main difference is in the grille design. The SM58 was designed for vocal applications, and therefore uses a ball grille with built in pop filter to eliminate plosives. The SM57 is designed as an instrument microphone, where a smaller grille size is more practical and plosives are less of a concern. Subsequently, the SM57 does not use a ball grille with pop filtering and instead uses an integral resonator/grille assembly, where the grille is actually part of the cartridge.
Each grille design places the diaphragm of each microphone in a different acoustical environment. The distance from the top of the grille to the diaphragm is shorter on the SM57 compared to that of the SM58, which allows for a more pronounced proximity effect through closer mic positioning. Additionally, the different resonator/grille assembly design of the SM57 produces a slightly higher output above 5 kHz.
If you're canny can cannibalise an old 57 or a Unidyne B and a bit of spare plastic housing you can make a swap grille and have two mic characteristics in one
Distancing the whistle is probably a good idea as the effect of the 57 shield is to slightly raise the response above 5kHz, which might be the opposite balancing you need. If you don't want to get too close then use a vocal pop shield.
PS. the SE1 is a good home recording buy (get a pair if you can) but then you need an interface with phantom power