I'd like some opinions. I have at my disposal two sets of mics, one a pair of Beyerdynamic MCE 86 shotguns, and the other a pair of Sennheiser ME66/K6 shotguns. At the end of the month I plan on recording moe. and Rusted Root at the Tower City Amphitheater in Cleveland, and I can't decide which ones to use. The Sennheisers use battery power and the Beyers don't, which really isn't an issue, since my recorder, a PMD660, runs the Beyers almost 3 hours on cheapo batteries. I looked at the polar pattern diagrams and the frequency response diagrams to decide which to use, but the Sennheisers list the response in dBv, whereas the Beyers are in straight dB.
OK, so I guess this might be a two part question. How do I compare the two diagrams when they are in different units, and which mics should I use? The venue is outdoor, but I have windscreens for boths, and shockmounts. I'm thinking I might want to do one segment with one set, then the other with the other set, to compare the two. Opinons, gentlemen? (and ladies...)