Etymotic ER4 SR/XR Noise-Isolating Earphones Model:ER4XR Extended Response The corresponding models of both

The corresponding models of both product families PRO and Edition are hardly distinguishable in terms of sound

the inside of the earpads have been tightly sealed

ready for another day's listening

1 cm) (diag

the textured black finish is highly shock- and scratch-resistant

Etymotic ER4 SR/XR Noise-Isolating Earphones Model:ER4XR Extended Response The corresponding models of bothWhich 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