Etymotic ER2 SE/XR Noise-Isolating Earphones (Open Box) OPEN-BOX this headphone gives you a

this headphone gives you a better experience

Qualcomm® aptX™ Adaptive audio

the Audio-Technica ATH-M70x Professional Monitor Headphones feature proprietary 45 mm large-aperture drivers and are tuned to accurately reproduce extreme low and high frequencies (5 to 40

Balanced 4Vrms Dimensions (WxHxD) 68

4 mm) maximum body diameter Output Connector Integral 3-pin XLRM-type Audio-Technica Case Style R1

Etymotic ER2 SE/XR Noise-Isolating Earphones (Open Box) OPEN-BOX this headphone gives you aWhich ER2 is right for you? Both ER2 models, the ER2SE and ER2XR, use the same low impedance dynamic drivers. That means they are easy to drive, and no amplifier is required. The only difference between the 2 models is the tuning of the lower (bass) frequencies. The Studio Edition ER2SE is tuned to have a flat frequency response. The eXtended Response ER2XR is tuned to have an emphasized bass, adding 1 2dB to the mid bass and 3 4dB to the sub bass.