Summary
The Etymotic ER-4P MicroPro Earphones work on one very simple principle to provide you with the best possible music reproduction. And this they do extremely well. Basically, their unique design – with either foam or three-flange eartips – cuts out as much outside noise as possible. Then, out of the silence, these professional earphones produce the richest, most vivid sounds thanks to the high sensitivity and enhanced bass. Even though you can easily enjoy your music at safe, low volumes, the power output of the ER-4P is mightily impressive.

To accompany the fantastic sound quality you enjoy with the Etymotic ER-4P MicroPro, it comes with a range of accessories to improve your experience. Change the eartips to feel as comfortable as possible, before clipping the cable to your shirt to hold it in place. And when you’ve finished listening, pack the earphones away safely in the travel pouch or case.

Manufacturer’s Description
The ER-4 MicroPro earphones are the next best thing to live music, with noise isolation far surpassing that of active noise-cancelling earphones. The ER-4s do not require batteries, and can be plugged into any audio source. Their external noise exclusion with foam or eartips allows you to hear the full dynamic range of recordings without having to play them at unnaturally high and unsafe levels.

ER-4P (Portable) earphones can be used with portable CD, MP3, DVD and other players without requiring an additional amplifier. As compared to the ER-4S, the ER-4P has 10 dB greater output at high frequencies and 13 dB greater output at low frequencies. The higher sensitivity and enhanced bass of the ER-4P have made it the most popular earphone for most uses.