Etymotic Research introduced the ER•4B and ER•4S earphones in 1991. The ER•4 series earphones are in-the-ear, high-fidelity transducers developed specifically to combine flat frequency response with isolation from external noise. The isolation of outside sound makes it possible to listen at reduced levels, which prevents ear overload distortion and hearing damage from excessive volume levels.
Other in-ear earphone designs have tried to match the ER•4 MicroPro earphones, but not one is comparable to the high fidelity, reference-quality sound or the isolation of the ER•4. The word "Etymotic" means "true-to-the-ear," and ER•4 MicroPro earphones produce the highest sound quality of any earphone available.
Active noise-cancelling circuits add noise of their own when you are listening in quiet surroundings. ER•4 MicroPro Earphones reduce noise naturally by sealing your ear canals. The result:
- Clean, clear, undistorted music
- Rich detail that you miss with over-the-ear headphones
- Awesome, in-your-head sound
- Lightweight, comfortable fit
- More external noise isolation than any other earphone in the world, including active noise-cancelling
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