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'. '.strtoupper('e')tymotic 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'. '.strtoupper('e')tymotic 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'. '.strtoupper('m')usic enthusiasts can appreciate the sweet unblemished etymotic sound that retains its accurate midrange while presenting a warmer and darker sound execution'. '.strtoupper('e')tymotic er3 xr are a must have for discerning engineers audiophiles and consumers wanting the most accurate in ear earphone available'. '.strtoupper('e')asy replacement and customisation of the detachable cable makes the er3 xr a highly versatile earphone'. '.strtoupper('a')ccurate and warm sound delivery'. '.strtoupper('e')xtended 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'. '.strtoupper('t')he 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'. '.strtoupper('p')ioneering 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'. '.strtoupper('a')dvanced 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.