Zeke, just because you use two mics doesn't mean you're going to have a phase problem. In the situation you described the two signals wouldn't be too far apart in phase. If you're working in a DAW you can look at the two wave forms and copare their phase. If you're not using a DAW you still have your ears. If there's a phase proble, you'll hear it. If when you have both mics solo'd it'll have weak bass or a strange hollow sound. When you mute one of the mics, the bass response will improve. Now if you're mic'ing a kick with a mic inside and one on the beater side there's a good chance you could run into a phase problem. You see, when the beater strikes the drum head, the initial pulse will cause a positive excursion on the inside mic and can cause a negative excursion on the outside mic by the beater. In a case like this the two signals when summed to mono would be 180 degrees out of phase. Again, use your ears if you don't have a DAW to see if you have a problem. You can either flip the phase of the offending mic, start moving the mic around or in a DAW, slide the track around to line the phases up.
