2 bass drum mics

[SEAN8293]

when my band played at a high school battle of the bands, my drums were miced, i have a porthole in the bass drum, so the guy stuck an internal mic in it (shure beta 91 i think) and a regular bass drum mic (the kind thats on a low stand that goes right in front of the port hole) was also used

how does 2 bass drum mics sound compared to just one?

[Cant Get Enough]

It's to dedicate the inside mic to pick up the transients while the outer mic picks up the lower frequencies. Creating a real defined intense low end thump. Metalica's And Justice For All really exploits this attribute, a constant in heavy metal. But you say "in front of the hole" wich will pick up a undefined cloudy woofy sound. Usually it's to the side of the hole.

[bongobill]

depends on how far the mic is into the hole. This help to define and pick up the strike of the kick pedal. In addition, I am assuming the mic is gated with a very tight trigger.