Location: This recording was taken in a 4-story stairwell in the Jacobs Science Building on Harvey Mudd Campus.
Description of the Space: I took the balloon pop recording on the 1st floor landing in the stairwell between Jacobs and Keck on Harvey Mudd Campus. This is a stairwell that spans 4 stories; the stairs themselves are concrete, the doors are heavy and wooden, and the walls are plastered. The stairwell is open in the sense that one can stand at the very bottom and look up the center and see all the way up. For this recording, I closed all the doors so the stairwell was isolated, placed the recorder 3 steps up from the 1st floor landing, and popped the balloon on the 1st floor landing (this means the recorder was about 6 feet from the balloon).
Maximum intensity: 74.4 dB
30 dB drop: 2.5 s after peak
50 dB drop: 2.8 s after peak
Minimum intensity: 18.1 dB
The space apparently reverberates at 200, 500, 1000 Hz.