Boom. A sine wave at 142 Hz, originating from Subway Tunnel. Recorded in a cathedral environment, era: 1970s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #4609 — Boom
ID#4609
Rarity
MID:49%
Frequency
142 Hz
X-HI:9%
Wave Type
Sine
X-HI:13%
Resonance
Metallic
EX:5%
Era
1970s
X-HI:6%
Origin
Subway Tunnel