Wail 84. A sine wave at 20 Hz, originating from Subway Tunnel. Recorded in a chamber environment, era: 1970s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #1469 — Wail 84
ID#1469
Rarity
LO:69%
Frequency
20 Hz
EX:4%
Wave Type
Sine
X-HI:13%
Resonance
Warm
X-HI:11%
Era
1970s
X-HI:6%
Origin
Subway Tunnel