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.

(Chi-fi IEM Review) Fidue Gem 4: The resolution is very high, but the overall balance is aggressive, with a lot of distortion and a dry sound characteristic of balanced armatures.

Fidue Gem4

Fidue Gem4




  • This review is written based on a "private purchase" or "product rented for a price".
  • No remuneration or compensation, such as a manuscript fee, has been received for publishing this, and it is an honest evaluation based on measurement data from personal testing and personal opinion.
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  • People who like high resolution sound
  • People who like the dry sound of balanced armatures
  • People who like delicate expression


Overview of Fidue Gem 4

This review will give an overview of Fidue Gem 4. A complete review of this product can be found here.


audio-sound Score

  • Total Score: 7.9 / 10.0
  • Package: 8.0 / 10.0
  • Build quality: 8.0 / 10.0
  • Fitment: 8.5 / 10.0
  • High range: 8.0 / 10.0
  • Mid range: 8.0 / 10.0
  • Low range: 8.0 / 10.0
  • Less distortion: 6.5 / 10.0


  • Want to see the score ranking? Click here!


Basic Specifications
  • Frequency response: 10Hz to 40kHz
  • Impedance: 50Ω
  • Sensitivity: 112dB/mW
  • Cable connector: 0.78mm 2pin



The package meets the price standard.


Package contents

The accessories are relatively complete. There are enough eartips.

  • Fidue Gem 4
  • Carrying case
  • Eartips (2 types)
  • 3.5mm to 6.35mm adapter
  • Cleaning Tool
  • Aircraft adapter


Fidue Gem4
Fidue Gem4
Fidue Gem4
Fidue Gem4
Fidue Gem4
Fidue Gem4

Fidue Gem4


Build quality

The build quality of the exterior is well within the standard of the price. However, most Chinese earphones these days have beautiful designs even in the $100 range, so I'm not too surprised.


Fidue Gem4
Fidue Gem4
Fidue Gem4
Fidue Gem4



The fit is quite good, but the stem is a bit long, so it may be hard to fit for people with small ears.


Fidue Gem4
Fidue Gem4
Fidue Gem4
Fidue Gem4


Sound quality

REW Frequency Response

Fidue Gem 4


Sound quality description

In this review, I use the standard eartips (balance) size L and drive it with the FiiO M15.


Fidue claims to have enhanced resolution with its own technology, and indeed, the sound is very high resolution and clear.


The overall tuning has a high fidelity of the original sound, which can be described as a studio-tuned sound, with the midrange retracted to emphasize the three-dimensional effect. The midrange is retracted to emphasize the three-dimensional effect. The lower midrange is also emphasized a little, and the sound is a little aggressive and loud. If you like a bright and clear sound, this is not bad, but you may not like it because of its strong habit.


In addition, perhaps because of the higher resolution, the high distortion characteristic of balanced armature drivers is reflected in the sound, and the distortion is strong in the mid to high frequencies, which can be heard clearly, so you may often feel uncomfortable in the expression of the vocal band.


Please see here for detailed reviews on sound quality.


Sound quality general comment
  • Original Sound Fidelity: A+
  • Recommendation: B+
  • Personal preference: B-


The overall fidelity of the original sound is high, and above all, the resolution is excellent, making it a gem that will satisfy resolution-conscious audiophiles quite well. However, its sound is typically balanced-armature-like, with a lot of distortion and a tendency to sound dry.


Even audiophiles who love neutral tuning and faithful, flat sound will not like a sound that tends to sound strangely twisted in space in the midrange. Because of its weakness in the vocal range, it will be difficult to satisfy audiophiles who are generally particular about vocal imaging.


The fact that it tends to sound aggressive in general also makes it a choice for some people. People who like flamboyant sounds may like them to a certain extent, but those who seek a calm atmosphere in music may not find them suitable at all, since aggressive songs by nature tend to sound rattling and clattering. No matter what kind of music you listen to, you won't be able to shake off the strangely pushy feeling.



Sound quality features
  • High overall clarity and excellent resolution
  • Aggressive and enjoyable sound
  • Fairly high overall fidelity of the original sound
  • Brilliant and flashy
  • Accentuated dynamism


  • Dry and artificial sound like a balanced armature
  • Low frequencies with no depth
  • Midrange sounds flat and full of incidentals
  • Deep and dark midrange
  • Can be tiring to listen to in some cases
  • Lacks a sense of fullness and sounds cheap


Fidue Gem 4


General comment

The Fidue Gem4 is a very high-resolution sounding earphone that can impress those who like a clear sound. However, the sound is a bit too aggressive and has a lot of balanced-armature-like distortion, which makes it hard to say that it is highly transparent.


Fidue Gem4

Fidue GEM4

Fidue Gem4