Etymotic Research ER-4PT MicroPro Earphones


Still one of the best audiophile in-ear headphones, the repackaged Etymotic ER-4PT is identical to the original ER-4P design and delivers outstanding musical clarity unsurpassed at its price. With tightly controlled bass and articulate, extremely well-extended highs, these little in-ears deliver pristine audio. High efficiency plus low impedance makes the ER4P a great earphone to plug directly into portable players like iPod, iPad and MP3 devices. 

  • Product Features:

    • Perhaps clearest, most detailed audiophile sound at this price
    • Excellent musical resolution of mids & highs subtleties
    • Top isolation / ambient noise-blocking ability just like earplugs
    • Excellent accessory kit contains array of eartip & tool assortment
    • Made in the USA!
  • Specifications:

    • Driver Type: Balanced Armature
    • Impedance @ 1kHz: 27 ohms
    • Sensitivity: 122 dB SPL/V
    • THD+N:
    • Isolation: -22dB ~ -30dB
    • Connector Type: 3.5mm (1/8")
    • Cable Length: 5 ft.
    • Cable Style: Straight Y
    • Weight: 1 oz.
    • Manufacturer Warranty: 2 year

    What's In The Box:

    • Various silicone or foam eartip sets
    • Travel case
    • Shirt cord clip
    • Full-size 1/4" stereo plug adapter
    • Owner's manual
    • Filters (x4)
    • Filter Removal Tool
    • ER-4PT to ER-4S Conversion Cable
  • The earphone & audiology research gurus over at Etymotic Research in Illinois, USA have again re-vamped the ER-4P adding the 'T' (for 'Traveler') to the name -- which means solely the addition of a handy airline plug adapter and nifty new packaging. Otherwise, the ER-4PT remain the exact same awesome in-ears they've always been: a low-impedance, highly-efficient version of their 'amplifier-only' ER-4S model. Similar to the ER-4S in every way but impedance, the ER-4PT have attracted great interest in the in-ear world due to Etymotic's ('true to the ear') clean bass response and ability to achieve fast musical dynamics and robust volume levels from portable players (or other weak audio sources) without demanding a dedicated headphone amplifier. Etymotic's signature 'lean but tight' low-end response combines with truly excellent upper treble extension to provide a pleasantly engaging listening experience for mobile audiophiles seeking neutrality and true acoustic transparency. Huge bassheads should probably look elsewhere, however, since the ER-4PT bottom-end is perhaps a tad controlled for extra-funk hip-hop styles. So, what does all this mean? If you want to use reference high-performance earphones directly out of portable audio sources like iPod, iPhone, iPad, MP3, and computers sans amplifier without breaking the bank, the ER-4PT could be precisely what you need.

    This low-impedance, single-microdriver earphone is the perfect portable audio player buddy and rates at a highly efficient 27 ohms impedance. The Etymotic ER-4PT's earphone cabling is made out of a softer rubber material than the ER-4S type which slightly reduces the problematic 'microphonic' cable noise effect (the 'cord just hit me' thump that echoes through your skull), which tends to be a common phenomenon with many in ear headphones. As far as other features go, the ER-4PT look like, are the same size, weigh the same, have the same earpieces/accessories, and come in basically the same package as the venerable high-impedance ER-4S model. The ER-4PT come with several different eartip types and sizes -- flanged silicon, rubber-flex, and squishy foam types -- plus 2 pairs of earphone nozzle filter replacements within the box. Now includes ER-4PT to ER-4S Conversion Cable.

    Obtaining a good ear canal seal/fit with the Etymotics--or with ANY in ear headphone--is critically important for best sound quality. Please watch the Etymotic Insertion Video to learn more about proper in-ear insertion techniques.


    As a very cool extra, optional custom audiologist in-ear molds for the ER-4 are available via Etymotic. Any customer purchasing an Etymotic product can register their product at; after registering, you'll print a voucher from the Etymotic site, then schedule an appointment with an audiologist in the Etymotic network (which can be located through the Etymotic website by entering your zip code). Then take the voucher to the audiologist appointment, the audiologist takes impressions of your inner ears and sends the impressions -- along with the voucher -- to the Ety labs. Customer pays nothing to the audiologist; the lab will contact you for credit card payment ($100usd); the lab then produces the molds and ships them to the customer with the lab compensating the audiologist. BAM! It's a really easy way to get into 'master-level' sound quality performance and superb personalized wearing comfort at a very reasonable expense.

  • Etymotic Research ER-4PT Frequency Response

    View our full featured 'Build a Graph Tool' for headphone comparisons and in-depth measurements.

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