Studio Reference in-ear earphones - Extended response
Etymotic invented noise-isolating, in-ear earphones. The ER4 MicroPro series earphones were the first earphones commercialized using balanced armature technology and are recognized as the world
leader in response accuracy, to which all other earphones are compared. After more than 20 years, these reference-quality earphones are still the choice of serious sound engineers, audiophiles and
musicians. World leader in sound reproduction Features Highest noise isolation Best durability and warranty What’s In the Box?
- Unsurpassed frequency response accuracy and sound quality — 92%+ response accuracy from 20 Hz – 16 kHz
- The only earphones with balanced-armature, precision-matched, custom-tuned drivers
- Highest output sensitivity in its class