Grain 63. A square wave at 142 Hz, originating from Subway Tunnel. Recorded in a chamber environment, era: 1960s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #5012 — Grain 63
ID#5012
Rarity
LO:61%
Frequency
142 Hz
X-HI:9%
Wave Type
Square
X-HI:10%
Resonance
Dense
X-HI:6%
Era
1960s
X-HI:6%
Origin
Subway Tunnel