Etymotic Research ER4SR Reference Earphones Etymotic Research We have succeeded in leveraging

We have succeeded in leveraging the experience of developing and manufacturing our own dynamic drive unit to draw forth the advantages of pure Beryllium

making the Pro X30 the perfect choice for use on stage or other noisy environments

operation of the newly developed true Beryllium driver is extremely delicate

While at first glance it may seem correct to select an ergonomic shape and hold it in place with the elasticity of silicone

5mm cable adapter for laptops

Etymotic Research ER4SR Reference Earphones Etymotic Research We have succeeded in leveragingOverview 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.