Etymotic Research ER-4S Canal Phone earspeakers Specifications

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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.
Serial numbers of units reviewed: 1272, right-channel module; 1201, left-channel module.
Price: $330. Approximate number of dealers: 25.
Manufacturer: Etymotic Research, 61 Martin Lane, Elk Grove Village, IL 60007. Tel: (708) 228-0006. Fax: (708) 228-6836. Web:

Etymotic Research
61 Martin Lane
Elk Grove Village, IL 60007
(708) 228-0006