ER•4 MicroPro™ Series

ER-4 MicroPro Series
ER-4PT Earphones
ER4PT User ManualUser Manual Downloads
ER•4PT Manual
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ER•4(B/S/P) Manual
  • ACCU•Driver™ Technology
    • High performance, balanced-armature drivers are specified for a response accuracy of 86% or better.


In a Class by ItselfWhich ER-4 is Right for You?

Etymotic invented noise-isolating, in-ear earphones. Etymotic's original insert earphone design, developed for auditory research and medical diagnostics, used balanced armature receivers and established these speakers as the gold standard for high-definition, in-ear earphones. The ER•4 MicroPro series earphones were the first earphones commercialized using this technology and are recognized as the world leader in response accuracy, to which all other earphones are compared. After more than 20 years, these reference-quality earphones are still the choice of serious sound engineers, audiophiles and musicians.

ER•4PT, the newest model in the MicroPro series, is intended for sound engineers and audiophiles in constant motion. ER•4PT combines the acoustic characteristics and features of ER•4P earphones and accessories for traveling professionals. Also included is an industry-exclusive channel-matching compliance graph, signed by the Etymotic engineer who precision matched and custom tuned the balanced-armature drivers.

Backed by decades of research and development for the ear

  • World leader in sound reproduction
    • Unsurpassed frequency response accuracy and sound quality — 86%+ response accuracy from 20 Hz – 16 kHz
    • The only earphones with Accu•Driver™ balanced-armature, precision-matched, custom-tuned drivers
    • Highest output sensitivity in its class
  • Timeless style and fit
    • Professional quality and reliability
    • An assortment of noise-isolating ACCU•Fit™ eartip options to ensure proper seal and comfort
    • CUSTOM•FIT option available
  • Highest noise isolation
    • First earphones to completely seal the ear
    • 98% (35 dB - 42 dB) noise isolation —highest of any earphones or headsets on the market today
    • Reduction of outside noise reduces the risk of listening at unsafe levels
  • Best durability and warranty
    • 2-year replacement warranty
    • Braid-reinforced cable for extremely low microphonic effect
    • ACCU•Filter™ user-replaceable filters protect the balanced-amature drivers from ear wax

For Domestic U.S. Orders

Visit the Customer Service Shipping page for pricing.

For International Orders Under $50.

When ordering from the Etymotic web store ( an automatic UPS shipping fee is charged to your credit card.

International orders less than $50 are shipped via the U.S. Postal Service for $2.00. Once the order is processed through the Etymotic shopping cart, a refund for the difference will be applied to your credit card.

Small Beige Foam Eartips
Ear Canal Opening: 6-9mm
BUY NOW - $14.00 4 Pairs

Large Yellow Foam Eartips
Ear Canal Opening: 10-14mm
BUY NOW - $14.00 3 Pairs

Black Foam Eartips
Ear Canal Opening: 8-13mm
BUY NOW - $14.00 5 Pairs

Small Frost 3-Flange Eartips
Ear Canal Opening: 7-11mm
BUY NOW - $14.00 5 Pairs

Airline Adapter
BUY NOW - $10.00 Each

Glider Eartips
Ear Canal Opening: 8-11mm
BUY NOW - $14.00 3 Pairs

Gray 3-Flange Eartips
Ear Canal Opening: 8-13mm
BUY NOW - $14.00 5 Pairs

ER•4 P to S Converter Cable
BUY NOW - $49.00 Each

Filter Removal Tool
BUY NOW - $1.50 Each

Filter Removal Tool with 4 Filters
BUY NOW - $11.50 Each

Green Filters
BUY NOW - $15.00 6/pkg

Shirt Clip for ER•4
BUY NOW - $8.00 Each

Zippered Pouch
BUY NOW - $4.00 Each

Deluxe Zippered Pouch
BUY NOW - $14.95 Each

1/8" to 1/4" Stereo Adapter
BUY NOW - $3.00 Each

Smartwrap Cord Winder
BUY NOW - $5.00 Each

Note: ER-4 eartips are not interchangeable with ER-6 eartips


The earphones fit into the ear canals with either soft plastic flanged eartips or foam eartips. The plastic eartips can be cleaned and reused.


  • For best performance and the most solid bass response, the eartips must be inserted deeply in the ear canals.
  • If one or both earphones stop working or has reduced volume, change the earphone filter. See About the Filter - Changing Filters for detailed instructions.
Earphone Insertion Video

Insertion and Removal of Eartips

      View Earphone Insertion Video
  • For best results, moisten the 3-flange eartips before insertion.
  • Using your right hand, grasp the eartip with the red plug.
  • With your left hand, pull up and back on your right ear to straighten your ear canal.
  • Carefully insert the right earphone so that it seals deeply and comfortably in your ear.
  • Repeat procedure for the left ear, using the earphone with the blue plug.
  • Remove earphones slowly with a twisting motion to gradually break the seal.

Foam Eartips

If a good seal cannot be obtained with the 3-flange eartips, use the black foam eartips supplied with the earphones.
  • Firmly grip the 3-flange eartip with one hand and the earphone with the other.
  • Remove the eartip from the earphone, and replace it with a black foam eartip.
  • Compress the foam eartip by rolling it between your fingers.
  • With the opposite hand, pull up and back on your ear to straighten your ear canal.
  • Carefully insert the earphone into the ear canal, holding it in place until the foam expands to produce a seal.

Proper Earphone Use

When used correctly, the ER•4 MicroPro earphones will provide excellent performance and high quality audio. Because the ER•4s provide exceptional sound reproduction and unrivaled isolation from outside sounds, high playback levels are unnecessary.
  • Set the volume control of the audio source to minimum.
  • Insert the 3.5mm earphone plug into the headphone jack (a 1/4" adapter is also supplied).
  • Set the volume control to a comfortable listening level.
  • Do not use insert earphones while driving a motorized vehicle, operating machinery, bicycling or jogging, because you may not be alerted to potential danger.
  • Do not use the earphones at excessively loud levels.


  • Do not expose the earphones to extreme temperatures.
  • Avoid dropping and strong impact.
  • Leave eartips on the earphones for shock protection.
  • Do not pull on the cord to remove the earphone from the audio device or the ear.
  • Clean or replace eartips prior to use by others.

Cleaning and Replacing Eartips

Over time eartips may lose their elasticity. For best performance and retention, replace 3-flange eartips every 3-6 months. Replace foam and glider eartips regularly.

To clean the 3-flange eartips:

  1. Remove the eartip from the earphone.
  2. Clean with water and mild soap.
  3. Dry the eartip before placing it back on the earphone.

About the Filters

ER•4 MicroPro Earphones have special filters that smooth the frequency response and prevent earwax from entering the earphones. A filter is located at the end of the earphone and is visible when the eartip is removed. If a filter becomes clogged, it should be replaced. A dirty filter will reduce earphone output. A filter should be changed if the loudness decreases or the sound quality declines.

Note: Filters are not reusable.


Note: Use the tool to remove the filter.
1. Remove eartip. 2. Insert tool into the filter. 3. Remove filter and discard.


Note: Do not use the tool to replace the filter.
4. Insert a new filter and press
    gently against a hard surface
    to secure it in place.
5. Re-attach eartip.

Accurate Earphone Reproduction

For earphones to have 100% accuracy, a recording of a live performance must produce exactly the same sound at the eardrum as the original performance. To achieve this, the acoustic properties of the ear must be factored in. The acoustic resonance and horn effects of the ear change a flat audio signal entering the open ear into sound with a (2700 Hz) high-frequency boost, which is the same response heard at the eardrum in a typical ear.

Channel-Matching Compliance Graph supplied with each ER•4PT

Frequency Response
20 Hz - 16 kHz
Accuracy Score
4B (92%) 4S (92%) 4P (86%) 4PT (86%)
balanced armature
Noise Isolation
35-42 dB
Impedance (@1 kHz)
4B (100 Ohms) 4S (100 Ohms) 4P (27 Ohms) 4PT (27 Ohms)
Sensitivity (@1 kHz) SPL at 0.1V
4B (90 dB) 4S (90 dB) 4P (102 dB) 4PT (102 dB)
Maximum Output (SPL)
122 dB
5 ft
User Replaceable ACCU•Filters™
2 years

MicroPro Frequency Response (measured at eardrum)

  Made in the USA    
ER•4 MicroPro is a trademark of Etymotic Research, Inc.
"et-im-oh-tik" true to the ear
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