Etymotic ER2 SE/XR Noise-Isolating Earphones Model:ER2XR Extended Response Addressing RF issues is usually

Addressing RF issues is usually non-existent in USB cables

There is an aperture on the back of the housing which act to extend the reproduction band of low frequencies

she wept tears of gold

Output impedance: 0

The ER2SE is ideal for sound engineers

Etymotic ER2 SE/XR Noise-Isolating Earphones Model:ER2XR Extended Response Addressing RF issues is usuallyWhich 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.