audio-sound @ hatena

An audio review & news blog. The volume should not exceed 80 dB is recommended. I usually adhere to the safe-listening style by WHO. Please note that my aural impressions and interpretations of measurements are also made from a safe-listening style.

(News) ECCI YST-03 Brand New Triple Driver Hybrid IEMs With Beautiful Ear Shells




In-Ear Monitors are a partner to many audio lovers from all around the globe. Their easy drivability, excellent sound, and attractive prices make them an appropriate choice for music lovers. Today, we release a brand new set of in-ear monitors, the ECCI YST03. YST-03 is a triple driver hybrid set of IEMs with beautifully designed ear shells. The shells of YST-03 look so beautiful that the brand advertises them as a jewellry-like look. The main attraction here is actually the Dyed abalone shell structure that gets special treatment with PVD gold-plated frame around the face panel area. YST-03 boasts a pure high-resolution audio experience with a triple driver hybrid setup housing a 10mm CCAW Voice Coil Dynamic Driver paired with dual customized high-frequency balanced armature drivers. ECCI YST-03 doesn’t make any holes in your pocket, it is priced attractively at just 99.90$, you can check out more details here.



  • Triple Driver Hybrid Setup.
  • Dual Customised High-Frequency Balanced Armature Drivers.
  • 10mm Dynamic Driver With CCAW Voice Coil and Silicone Suspension.
  • Professional Acoustic Tuning.
  • Stunning Look.
  • PVD Gold-Plated Panel Mount.
  • Dyed Abalone Shell.
  • Easy To Drive.
  • High-Purity 5N Single-Crystal Copper Silver-Plated Cable.
  • Ergonomic & Comfortable.


Technical Specifications

  • Impedance: 25Ω±15%.
  • Sensitivity: 102dB/Vrms.
  • Distortion: <1%.
  • Frequency Response Range: 5Hz-40kHz.
  • Connectors: 0.78mm 2-pin connectors.
  • Termination Plug: 3.5mm.


YST, The Hybrid Driver IEMs

The YST series of IEMs from ECCI features a hybrid driver configuration. Previously, ECCI has launched the YST02(dual-driver hybrid) IEMs, the latest YST-03 brings us a triple driver hybrid configuration. The pair houses a classic combination of Dynamic and balanced armature drivers with a 10mm dynamic driver and dual customized balanced armature drivers. The DD unit here uses a silicone suspension and a high-quality CCAW voice coil. Both the drivers are arranged in a two-way frequency crossover similar to the ones we get in bookshelf speakers. They have both physical frequency division and RC circuit frequency division. The DD unit here produces a powerful lower-end response with a clean mid-range presentation while the BA drivers are here for high-resolution clarity in the treble region.


Built Like A Piece Of Jewellery

The ear shells of the YST-03 earphones are no less than a piece of jewelry. They have got a PVT gold-plated frame to the face panel area. The pair uses dyed abalone shells with a unique texture for each unit giving them a unique look for each shell. YST-03 earphones have got simple stunning looks.


Professionally Adjusted Sound Tuning

ECCI YST-03 gets professional treatment for sound tuning. The pair is tuned using a comprehensive application of sound psychology, acoustics, and subjective aesthetics. This results in a spacious soundstage with a detailed response throughout a wide frequency response range. The pair produces a stereo-like experience similar to that of a set of speakers.


Drive Them With Ease

YST-03 gets a low impedance rating of 25Ω along with a fairly high sensitivity of 102dB. It is designed to be efficient and easy to power. The pair works well straight off a smartphone without the need for any expensive gears.


Detachable Connector Cable

ECCI YST-03 comes with a high-quality single-crystal copper silver-plated cable. This cable has 2-pin 0.78mm connectors with a 3.5mm termination plug. High-purity single-crystal copper silver-plated core material ensures the signal loss is minimal during transmission and we get a pure sound experience.


Price & Availability

ECCI YST-03 is launched officially for 99.90$. The pair is available to purchase at HiFiGo, you can check out more details here.