My point is that I'm already picking up plenty of snare, even without the snare mic. Add to it the fact that the snare mic picks up a lot of other things I don't need it to, and don't even want it to.
The typical snare mic, take the sm57 for example, is not very well suited for more delicate tasks like micing hi-hat. Particularly when it's facing the opposite direction from it.
Think about it. Hypothetical scenario: Imagine you were to mic only a hi-hat. I don't know why you'd be doing it, but let's just say you were making a "hi-hat" compilation/greatest hits album. Would you use the following technique? :
* small-diaphragm condenser about 3-5 feet directly overhead
* sm-57 pointing away from it, in the opposite direction towards the floor. And blend to taste.
I don't think so. At least I would hope not. Yet, that's exactly what we wind up doing (in a sense) when we mic the snare, because you can't mic the snare without a ton of hihat bleed.
Alright, I suppose there is such a thing as a noise gate. But think about this . . .
do you like the sound of a gated snare? Getting beyond the threshold of the gate requires a millisecond or so, which means you lose at least a portion of that initial attack. Then of course you lose the ring after the gate kicks in.
So instead of getting a solid "thwonk!" what you kinda' wind up with is more like a "won!" And during simultanious snare/hi-hat/cymbal hits, you get more of a "sssswwwiiii WON!"
Which kinda' brings us full circle to the "that's why you use overheads" thing.
And my reply to that is . . .
p-r-e-c-i-c-e-l-y