With a B1 and a B3, you can do a very nice MS setup that is ideal for miking acoustic musicians in a "gather round the mic" configuration. Set up the B1 aimed right at the center of the entire group. Place the B3 in its figure-8 setting in the same upside down position, with the two sides facing exactly to the sides of the group (so that the figure-8 null is pointing dead center).simpleybass said:I can use just the B3 as a room mic (set to omni), but we got nice results using the B1 and B3 (set to cardioid) set up for x/y stereo, with B3 (upside down) right over the B1, turned out 80 degrees. Vocals and acoustic instruments from up to 5 people standing in a semi circle go into this stereo set-up nicely, especially when the band members position themselves properly around the mics.
Then mix the mics as follows: B1 gets panned dead center. The B3 gets split into two channels, one panned hard to the left, the other panned hard to the right and phase-inverted. Start by bringing up the level of the B1 to the desired level - it will be pure mono. Then bring up the two faders of the B3, keeping them exactly equal to each other (though not necessarily equal to the B1).
As you bring up the faders of the B3, you will find that your lovely mono recording gradually shifts to full stereo. You can determine the overall "width" of the stereo image by choosing the setting of your B3 faders.
This is an ideal way to capture a bluegrass band "in the round".