MODEL- ER-4P               VENDOR- ETYMOTIC RESEARCH

FEATURES- ER 4P (Portable) microPro Noise Isolating Earphones
       Portable earphones can be used with portable CD, MP3, DVD and other
        players without requiring an additional amplifier. The higher
        sensitivity and enhanced bass of the ER-4P have made it the most
        popular earphone for most uses.
       The 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 -- 35 dB with
        3-flange eartips, 42 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.
         - 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
    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 ----------------------------------
RESPONSE ACCURACY - 86%
NOISE ISOLATION   - 35 - 42 dB
FREQUENCY RESPONSE- 20 Hz to 16 kHz +/- 4 dB
TOLERANCE         - +/- 3 dB to 6 kHz, +/- 6 dB to 16 kHz re nominal
TRANSDUCER TYPE   - Balanced Armature
1 kHz SENSITIVITY - 108 dB SPL for a 0.2 volt input
                      (102 dB @ 0.1 V; 106 dB @ 1mW)
IMPEDANCE         - 27 Ohms
MAXIMUM OUTPUT    - 120 dB SPL
CONTINUOUS INPUT  - Maximum 0.75 Vrms
WEIGHT            - less than 1 oz.
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