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ETY-Plug |
Etymotic Research calls its ETY-Plugs (also known as ER-20 High Fidelity Earplugs) "low-cost, one-size-fits-most high fidelity earplugs that can be used in a variety of noisy environments." The ER-20 sells for around $12 a pair and uses a tuned resonator and acoustic resistor to attenuate all frequencies equally, reducing noise while preserving the frequency balance of the audio—eliminating the excuse most musicians use for not wearing vital ear protection. Etymotic recently launched a new version, ETY Baby Blues, for smaller ear canals.
etymotic.com.