Etymotic ER4 SR/XR Noise-Isolating Earphones Model:ER4SR Studio Reference with exception of line-level mode

with exception of line-level mode

while reproducing the details of the recording with precision

The entire spectrum

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The durability of stainless steel gives you peace of mind in daily use

Etymotic ER4 SR/XR Noise-Isolating Earphones Model:ER4SR Studio Reference with exception of line-level modeWhich 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