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What makes mics hum-sensitive?

Hi all,
I was wondering what makes a mic hum when I approach the swtiches, and pick up low level background hum that no other mics do.

I've been able to rule out ground loops, and I am using very well shielded cable. The body is screwed together very tighly, so there's no problem there.

Oh yeah, the mic also needs to be grounded to stop the hum getting very bad.

drum mics and best setup?

are a standard set of drum mics condensor mics that need phantom power or would u be able to connect them to a standard jack socket on a mixer?

i have a Behringer mixer with 2 phantom powered XLR sockets and 4 channels that are split into mono left and right with quarter-inch jack inputs.. i was wondering what mics and setup u anyone could suggest for recording a drum kit.

Mics picking up dampers too much

I recorded my Yamaha baby grand the other night and the mics were picking up too much of the dampers. I used one SM81 pointed a little in front of the dampers an octave below middle C 3 ft back, another 81 pointed past the dampers an octave below middle C about 5 feet back, and a Royer R121 about 4 feet from the second 81 to pick up the whole piano. Any mic position tips you guys could offer?

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