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Main Features : Etymotic Research ER-4PT MicroPro Noise-Isolating In-Ear Earphones (Black)

Highest noise-isolating earphones on the market

Reduction of outside noise reduces the risk of listening at unsafe levels

Designed for audiophiles, musicians and sound engineers

Assortment of ACCU-Fit eartips included to ensure proper seal and comfort, plus airline adapter and 1/4 inch stereo adapter

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, the newest model in the MicroPro series, is intended for sound engineers and audiophiles in constant motion. ER 4PT combines the acoustic characteristics and features of ER 4P earphones, and comes with extra mobile adapters and accessories for traveling professionals. Also included is an industry-exclusive channel-matching compliance graph, signed by the Etymotic engineer who precision matched and custom tuned the balanced-armature drivers.

An assortment of noise-isolating ACCU Fit eartip options to ensure proper seal and comfort First earphones to completely seal the ear 98% (35 dB - 42 dB) noise isolation highest of any earphones or headsets on the market today Reduction of outside noise reduces the risk of listening at unsafe levels Braid-reinforced cable for extremely low microphonic effect ACCU Filter user-replaceable filters protect the balanced-amature drivers from earwax Specifications - Frequency Response - 20 Hz - 16 kHz Accuracy Score - 4B (92%) 4S (92%) 4P (86%) 4PT (86%) Transducers - balanced armature Noise Isolation - 35-42 dB Impedance (@1 kHz) - 4B (100 Ohms) 4S (100 Ohms) 4P (27 Ohms) 4PT (27 Ohms) Sensitivity (@1 kHz) SPL at 0.1V - 4B (90 dB) 4S (90 dB) 4P (102 dB) 4PT (102 dB) Maximum Output (SPL) - 122 dB Cable - up to 5-feet Replaceable ACCU-Filters Manufacturer's 2-year replacement warranty