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. *** Note *** These are earplugs NOT headphones.
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