Resistance does not tell you anything, you can have two capsules that are 666 and because of the diaphragm tension they put out very different output levels.
I use a db meter calibrator B&K that puts out 1k at 114 db ( I have had a machined coupler for 6mm, 3mm,10mm and 12mm capsules) I then measure the signal level coming out of the capsule and match them to with in 0.01% of a db. I have a very accurate signal level meter it takes about $2,000 to have the set up I use just for matching level on capsules. Resistance will tell you that the FET has the same internal resistance but not the same output. But it does get you close. Many microphone companies use the same method I do for matching capsules. It is still not as accurate as full range matching but not nearly as expensive.
Chris Church
Hope that helps
quote author=O-Canis link=topic=63054.msg863171#msg863171 date=1147288189]
what capsules do you use in the B-99M? are they Panasonics?
My new B-99M is a great omni with 20 to 20 response and I can sell you a pair for $99.99 they have been tested out to 114 db with a distortion of less then 0.5%!
If they are how do you match them? Do you do what others do, and spend about $20+/- and just measure resistance across the terminals? That's what I did, and $5 more and I had a nice little pair of omnis. YMMV
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