Etymotic releases e-version of their pamphlet addressing the ER-4 MicroPro Earphones...impressive sound isolation while maintaining each instrument. Click Here for more information.
Click here to visit the Etymotic Research website.
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Etymotic releases e-version of their pamphlet addressing the ER-4 MicroPro Earphones...impressive sound isolation while maintaining each instrument. Click Here for more information.
Click here to visit the Etymotic Research website.
