Etymotic ER3-XR Earphones (Extended Response) Reference level accuracy with a slight bass boost, Etymotic ER3-XR Extended Response earphones have been tuned to render accurate midrange and high frequencies with slight low-end enhancement. Etymotic ER3-XR is ideal for anyone looking for exceptional sound quality together with metal crafted housing, detachable, user-replaceable cable and industry leading noise isolation. Etymotic ER3-XR are equipped with single high-performance balanced-armature drivers that have been tuned to deliver a large sound spectrum with enhanced bass response. Music enthusiasts can appreciate the sweet unblemished Etymotic sound that retains its accurate midrange, while presenting a warmer and darker sound execution. Etymotic ER3-XR are a must have for discerning engineers, audiophiles and consumers wanting the most accurate in-ear earphone available. Easy replacement and customisation of the detachable cable makes the ER3-XR a highly versatile earphone. Accurate and warm sound delivery. Extended Response High accuracy in the midrange and high frequencies with enhancement of the bass response without diminishing the frequencies for a clear, warm and satisfying listen. The ER3-XR deliver accurate sound for music lovers and hi-fi enthusiasts who want uncompromising accuracy in the midrange and high frequencies, but appreciate a bit of extra presence in the lower end. Pioneering Technology Etymotic earphones were the first earphones commercialised using balanced armature driver technology and are recognised as the world leader in response accuracy, to which all other earphones are compared. Advanced Isolation Providing the highest noise isolation of any earphones or headphones on the market today, Etymotic ER3-XR include an assortment of noise-isolating foam and silicone eartips options to ensure the right seal and comfort levels.