MODEL- ER-4B VENDOR- ETYMOTIC RESEARCH FEATURES- ER 4B (Binaural) microPro Noise Isolating Earphones ER-4B (Binaural) earphones are for the binaural recording enthusiast. The ER-4B is an ideal earphone for use with material that has not been equalized for loudspeaker playback. It was developed from the ER-1 earphone that is referenced to a flat diffuse field and used primarily for speech reception research, where the goal is to produce the same frequency response at the eardrum as would be produced in the live situation. Includes ER-4 MicroPro earphones, 5 ft. cord with 3.5 mm stereo phone plug, 1/4" stereo phone adapter plug, Six 3-flange eartips, 10 foam eartips, Filter changing tool, 4 replacement filters, Shirt clip, Pouch and Storage box. * Response Accuracy ER-4 MicroPro Earphones are designed to match the acoustic response of the open ear. Music is naturally bright, but not harsh. The lack of coloration results in smooth treble, full bass, clear and natural piano, percussion and orchestral music. * Noise Reduction ER-4 MicroPro Earphones provide the highest isolation of any earphone: 35~42 dB (two to three times that of active noise-canceling earphones). ER~4 MicroPro earphones reduce sound naturally, without the added weight, bulk, or external power supply required for active noise- canceling. - 3-flange eartips: 35 dB external noise isolation (NRR = 22dB) - Black foam eartips: 42 dB external noise isolation (NRR = 32dB) -- SPECIFICATIONs ---------------------------------- FREQUENCY RESPONSE- 50 ~ 10 kHz +/- 2 dB 20 ~ 16 kHz +/- 4 dB TRANSDUCER TYPE - balanced armature 1 kHz SENSITIVITY - 108 dB SPL for a .79v input IMPEDANCE - 100 Ohms nominal MAXIMUM OUTPUT - 122 dB SPL CONTINUOUS INPUT - Maximum 3.0 Vrms WEIGHT - less than 1 oz. www.etymotic.com
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