Hum Sounds, Recorded in Bayside, California

HUM1.wav
In order to really experience this, you will need to play it back through some kind of sub-woofer assembly. Ours is a simple bass-reflex enclosure designed for a frequency range of 14? to 110 Hz.

HUM2x.wav (pitch transposed for easy listening)
This one is transposed in pitch so that you can hear it with computer speakers, although headphones would be best.