Etymotic ER4 SR/XR Noise-Isolating Earphones (Open Box) Model:ER4XR Extended Response What is the Stellia’s soundproofing

What is the Stellia’s soundproofing capability

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The SI201 earbuds with MFi lightning connector is an audiophile answer to your lightning-only lifestyle

The comfort aspect was a priority when the spacious inner cups of the Performance series were being constructed

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Etymotic ER4 SR/XR Noise-Isolating Earphones (Open Box) Model:ER4XR Extended Response What is the Stellia’s soundproofingWhich 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