Yowl 73. A square wave at 1200 Hz, originating from Subway Tunnel. Recorded in a anechoic environment, era: 1940s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #0963 — Yowl 73
ID#963
Rarity
LO:66%
Frequency
1200 Hz
EX:4%
Wave Type
Square
X-HI:10%
Resonance
Crystalline
X-HI:5%
Era
1940s
EX:4%
Origin
Subway Tunnel