Etymotic Research ER-15, User Manual, Page: 6 / 8

Musicians Earplugs are flat-response attenuators that
lower sounds evenly at all frequencies. Sound heard
with these earplugs has the same quality as the
original, just quieter.
Musicians Earplugs Defined
Frequency in Hz
125 250 500 1000 2000 4000 8000
0
10
20
30
40
50
Sound Reduc
tion in dB
ER-25
ER-15
ER-9
EARPLUG ATTENUATION (Sound Reduction)
Mean Attn.