Hmm...that's gonna be kinda tough. The snare sounds pretty thin right now. What's in that mix? Top mic, bottom mic, overheads--or some combination?
As far as the two close mics go, I'd think you'll have much better success with the snare top. The bottom mic's gonna be all sizzle. Depending on how the snare is tuned, my snare top mic often sounds like a really tight tom.
If that's the case, I'd start with some combination of the following: (1) compression (plus maybe an envelope shaper to accentuate the attack) to make it pop; (2) EQ to bring out the lower boom and suppress the "smack" that a normal snare would sound like; and (3) Reverb to help complete the cannon effect. I'd start with a hall with a fairly long decay, but mixed in at a fairly low level--it's gonna tend to muddy things up quickly; I'd also go with some predelay between the snare and the reverb help keep it cleaner.
Good luck.