Purr 75. A sine wave at 220 Hz, originating from Mountain Pass. Recorded in a cave environment, era: 1970s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #1064 — Purr 75
ID#1064
Rarity
MID:43%
Frequency
220 Hz
X-HI:8%
Wave Type
Sine
X-HI:13%
Resonance
Hollow
X-HI:5%
Era
1970s
X-HI:6%
Origin
Mountain Pass