Studio Log 20100405: Here is a 51 second stereo audio sample (a two-tone sweep from 440 Hz to 40 Hz – one linear, the other logarithmic – followed by studio silence). The tracks were recorded using two Bluebirds from Blue Microphone. (Left channel mic serial #xx2763 and the right is #xx3183.) The mics were positioned next to one another (1¾” gap) 8 feet away from a single speaker. Note the difference in background noise between the two mics, especially through a spectrum analyzer. The recording was made through a Yamaha AW1600 with mic gains set identically (at max).

Bluebird xx2763 has not been used due to its higher noise floor (by about 10 dB). Instead a substitute Blue DragonFly works nicely for Piano recordings.