Etymotic invented noise-isolating, in-ear earphones. Etymotic's original insert earphone design, developed for auditory research and medical diagnostics, used balanced armature receivers and established these speakers as the gold standard for high-definition, in-ear earphones. ER•4PT earphones, intended for sound engineers and audiophiles in constant motion, comes equipped with extra accessories and adapters.
|Frequency Response||20 Hz - 16 kHz|
|Accuracy Score||4B (92%) 4S (92%) 4PT (86%)|
|Noise Isolation||35-42 dB|
|Impedance (@1kHz)||4B (100 Ohms) 4S (100 Ohms) 4PT (27 Ohms)|
|Sensitivity (@1 kHz) SPL at 0.1v||4B (90 dB) 4S (90 dB) 4PT (102 dB)|
|Maximum Output (SPL)||122 dB|
|User Replaceable ACCU-Filters||Yes|