Etymotic ER4SR or ER4XR

ER4SR = Reference Sound Signature // ER4XR = Bass enhanced Sound Signature

Technical Information:

Impedance: 47 Ohm

Sensitivity: 115dB/mW

Amplifier requirement: No

Detachable Cable: Yes (Proprietary MMCX Connector)


Target Headphone Loudness: 110,0 dB Sound Pressure Level

Power Required: 0,32 Milliwatts

Voltage Required: 0,1219 Volts

Current Required: 2,59 milliamps

Frequency response comparison made possible by /u/MathiasBoegebjerg