EDL ER4P/S Extended Range In-Ear Monitor

(2 customer reviews)


Product Spec

  • Response Accuracy: 92%
  • Noise Isolation: 35-42 dB
  • Frequency response: 50-10 kHz ± 2 dB; 20-16 kHz ±4 dB
  • Acoustic polarity: + electrical = + acoustic
  • Transducer type: balanced armature
  • 1 kHz sensitivity: 108 dB SPL for a 0.2 V input (102 dB @ 0.1 V; 106 dB @ 1mW)
  • Impedance: 27 Ohms nominal
  • Maximum output: 122 dB SPL
  • Maximum continuous input : 0.75 Vrms

SKU:  EDL ER4P/S Extended Range in-Ear Monitors Category: Tags: , , ,



This is a replication of Etymotic Research ER4P/S Extended Range in-Ear Monitors, a legendary of single BA IEMs, proudly made by earphone DIY Labs and save you 70% budget!

The kit is build on identical Balanced Armature Driver – Knowles ED29689 and 100% grantee the sound style/quality being identical to original ER4P/S.

Note we build this IEM per order, so please allow 3~4 days lead time before shipping

Note we are developing DIY kits which you could use and build your own ER4P, please keep an eye on us!

ER4P Kit
ER4P made by earphone diy labs



Knowles ED 29689 Extended Range Balanced Armature Driver

How does this ER4P sound?

Ultra-high resolution! And literally you can refer to most ER4P/S impressions, because they’re built with exactly same BA driver! (background knowledge: unlike dynamic drivers, balanced armature drivers is fully sealed. So the sound quality is solely determined by the BA driver, the acoustic design has minor impact). Here is a reference from Head-Fi: 

It is analytical and bright, fairly neutral while slightly on the thinner and colder side, tight and impactful bass that isn’t quantitatively large, resolving and fast which are very typical of BA based IEM. … The overall sound signature is analytical, a little on the bright side but not harsh, resolving and fast with slightly upper mid ~ lower treble focus; fairly neutral while still retains a tiny sense of warm. Bass is very tight, impactful but lacks a good body, while instruments separation is good, air and depth reproduction isn’t – thus soundstage is mediocre.
Also see the top review on YouTube:

What’re in this DIY KIT? 

  1. 1 X ER4P (optimized for portable) or ER4S (optimized for personal studios) – choose from order options 
  2. 2 color options – crystal or black
  3. 1 pairs of ER4P original ear pads 

Note, we save the original ER4 connectors (easy broken in daily use) to offer you best durability.

ER4P/S in Crystal 

ER4P Kit
ER4 in crystal
ER4P Kit
ER4P in crystal

ER4P/S in Black 

ER4P Kit
ER4P in black


ER4P Kit
ER4P in black

How if I have special requirements?

Please leave your requirements in the ordering note and we’ll handle them accordingly, or contact our service account for any issue. 



Collected from hundreds DIYers building this kit.

[FAQ 1] How does this kit compared with the IE800 kit? 
A: IE800 is better on ultra-low bass performance, like 5~10Hz which you can feel with you skin. While ER4 P/S and most BA drivers can not do that due to the size of its diaphragm. However, ER4 offers better resolution and fantastic female vocal. So it’s really depends on your flavor. And as both perform super great, the gap is tiny and barely perceptible. 

Additional information

Weight 0.1 kg
Dimensions 15 × 10 × 3 cm
Shell color

Crystal, Black

ER4P or ER4S


2 reviews for EDL ER4P/S Extended Range In-Ear Monitor

  1. Johanes Nilam (verified owner)

    i ordered the er4p from earphonediylabs 2 weeks ago.. eventhough i have not previously owned any etymotic earphones before i did own both shure se425 and se535.. and i was surprised by the quality of the er4p built by earphonediylabs.. the build quality and also the cable are excellent and i prefer the sound on these earphonediylabs er4p compared to my se535… the earphonediylabs er4p seems to be more accurate and clearer!! i really recommend anyone to try these out!!

  2. F. Yamamoto (verified owner)

    Excellent product that working perfectly well with my Shanling M3X & UP5. It actually needs less volume setting than that of the original cable.

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