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Etymotic Research ER-4S Canal Phone earspeakers:
Sidebar: Specifications Description: Dynamic, diffuse-field-response, in-the-ear-canal transducer. Transducer principal: dynamic diaphragm. Frequency response: 20Hz-16kHz ±4dB, 50Hz-10kHz ±2dB. 1kHz sensitivity: 108dB spl for 1V input, 98dB at 1mW. Impedance: 100 ohms, nominal. Maximum output: 115dB spl. Maximum safe continuous input: 3V. Weight: <28gm (1oz). Acoustic polarity: positive (acoustic and electric). Cord length: 4' with 1/8" stereo phone plug. Accessories included: ¼" phone-plug adapter, filter-changing tool, four filters, four extra eartips, shirt clip, carrying pouch.
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