Etymotic ER4 SR/XR Noise-Isolating Earphones add glow tips Newly designed 53 mm drivers

Newly designed 53 mm drivers with CCAW voice coils reproduce remarkably natural sound

listening all the details of your favorite music

and the treble part has a smooth texture and controlled really well

A sense of reality

with fast input switching and exacting sound quality

Etymotic ER4 SR/XR Noise-Isolating Earphones add glow tips Newly designed 53 mm driversWhich ER4 is right for you? Both ER4 models, the ER4SR and ER4XR, use the same Balanced Armature (BA) drivers. The only difference is the tuning of the lower (bass) frequencies. The ER4SR, being the reference model, is tuned to be as precise and flat as possible. The ER4XR, being the fun model, is tuned with added bass. As you can see from the frequency response graphs below, ER4XR adds 1 2dB to the mid bass frequencies (below 200Hz) and 3 4dB to the