I started this as a separate topic from SM-57 on snare because I have a different experience. Drummers ALWAYS loved my snare sound and I never used two mics. I "could" have used a bottom mic to add the snare sound, but every time I tried it I dumped it because I didn't need it. I can't think of one session where a drummer asked me "where is the snare sound?" For me the key was always WHERE I put the mic, and I never put it over the head. I usually had it a few inches out from the top of the head, just above level with the rim and pointing down at a 45-degree angle. The point was to "mic the drum, not the head" and position the mic so it "saw" (as in a "clear view for the polarity pattern") the entire body of the drum and not just the top head. It worked for me every time, and if anything, I had a lot of sessions where I had to ask the drummer to tighten up the snares or tape them because they were rattling. The result was that you heard the "wood" of the rim in the snare sound. If I needed more or less snare I would change the angle of the mic. For me, this gave me a truer snare sound than combining two mics. Doing the top mic that way, I could have added a bottom mic, but I just never needed to.