Etymotic Research ER4SR Reference Earphones Sennheiser This helps to improve sound

This helps to improve sound isolation and comfort

The unique ear cup design directs sound waves to the ear at a slight angle to create an impressively natural and spatial listening experience

18W x 2 (RMS) total output power

great sound

Etymotic Research ER4SR Reference Earphones Sennheiser This helps to improve soundOverview ER4SR is the highest performing single driver in ear monitor. The IEM shells are made of anodized aluminum, CNC machined with extremely tight tolerances. Using a single Balanced Armature (BA) driver allows for extremely accurate IEM without the added complexity of crossovers, and helps keep the aluminum body small and slim. The included high quality user replaceable cable is reinforced and twisted, to improve longevity and durability.