Chord 57. A square wave at 20 Hz, originating from Subway Tunnel. Recorded in a chamber environment, era: 1920s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #2531 — Chord 57
ID#2531
Rarity
LO:63%
Frequency
20 Hz
EX:4%
Wave Type
Square
X-HI:10%
Resonance
Brittle
X-HI:6%
Era
1920s
EX:4%
Origin
Subway Tunnel