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ER.20 High Fidelity Earplugs were developed to provide low-cost,
one-size-fits-most high fidelity earplugs that can be used in a variety of
noisy environments.
The goal of the ER.20 design was the same as for Musicians Earplugs: to reduce
noise but preserve sound quality; in effect, to turn down the noise but not
muffle voices, environmental sounds or music.
ER.20's use a tuned resonator and acoustic resistor to give essentially equal
sound reduction at all frequencies which preserves the fidelity of the original
sound.
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