Vocal mics CAN be cupped with harp, it compresses their tone dramatically,
and they produce fantastic results. I have included instructions for
Bullet mics and Wand vocal mics here:
http://www.angelfire.com/music/harmonica/ampdmics.html
I think cupping a ball and stick vocal like an SM58 is similar enough to a
bullet that I don't need to write instructions about it.
The main reason the harp guys in the fiftes played the bullet mics were
because they were poor, and the mics were ubiquitous cheap junk that could
be had for $5 at the local pawn shop. Bullet mics are after all vocal
mics. They were used for CB radios like US coastguards and in Taxi Cabs,
probably many other uses as well at the time.
It was a happy accident that they can be made to sound so cool.
-- G.
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