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Etymotic ER4 SR XR Noise Isolating Earphones (Open Box) American brand The DT 770 990 PRO is planar magnetic The DT 770 990 PRO is made for musicians Frequency Response 18 Hz 22 ER4XR adds 1 2dB to the mid bass frequencies (below 200Hz) and 3 4dB to the lower bass and sub bass (below 100Hz) we need to account for the resonance inside the average ear canal
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