From a Manufacturer

The Etymotic Research ER-6i Isolator is a compact, earbud-style set of earphones which have been preferred for transport as well as personal listening. If you’ve ever been a doubter of earbud receptive to advice quality, a ER-6i will break a headphone parable which larger is better. The ER-6i facilities a sound siege of 34-36 dB which distant surpasses which of active noise-canceling earphones. This makes a ER-6i a undiluted preference for travelers, since these earphones will actively terminate …
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