Replacement Etymotic Filters for Musicians’ Earplugs. Designed for use with the Westone ES49 Musicians’ Earplugs.
Etymotic filters feature a flat frequency response that allows musicians to hear their performance accurately while providing hearing protection. Etymotic ER-25 Filters provide 25 dB of essentially flat sound reduction from 125 Hz through 8 kHz. Westone recommends the ER-25 filter for situations where the ER-15 does not provide enough hearing protection.