Etymotic Research MicroPro™ ER-4P Consumer Headphones

The Etymotic Research ER 4 MicroPro™ earphones are the next best thing to live music; with noise isolation far surpassing that of active noise-canceling earphones. The ER•4s require NO batteries; and can be plugged into any audio source. Their external noise exclusion -- 33 dB with 3-flange eartips; 41 dB with foam eartips -- allows you to hear the full dynamic range of recordings without having to play them at unnaturally high and unsafe levels. Etymotic ER-4 MicroPro Noise Isolating In-Ear Earphones - ER4P Transparent; reference- quality sound For audiophiles; performing musicians and recording engineers For mixing; monitoring and critical listening Accurate real-ear response Unsurpassed isolation from outside sound Frequency response: 20 Hz to 16 kHz 4 dB Acoustic polarity: + electrical = + acoustic Transducer type: dynamic 1 kHz sensitivity (ER-4P): 108 dB SPL for a .25v input Impedance (ER•4P): 27 Ohms nominal Maximum output: 122 dB SPL Maximum continuous input (ER•4P): .75 Vrms Weight: l

Noise isolation: 35-42 dB Maximum output: 122 dB SPL Weight: less than 1 oz. Response accuracy: 86% Frequency response: 50-10 kHz ± 2 dB; 20-16 kHz ±4 dB, Platforms: Windows