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.

(True Wireless Earbuds Review) Sudio E2: The most attractive feature is the highly immersive spatial audio mode; ANC performance is also quite good and fully functional.

Sudio E2

Sudio E2




  • This review is based on a sample provided by Sudio to convey a sincere quality review to our readers.
  • 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.
  • Please read the privacy policy of this website.


  • People who want to enjoy immersive sound
  • People who like fashionable earphones
  • People who want earphones with high functionality
  • ANC and hear-through oriented people
  • People who want to experience effective active noise cancellation
  • People who prefer wireless charging support


Overview of Sudio E2

This review will give an overview of Sudio E2. A complete review of this product can be found here.


audio-sound Score

  • Total Score: 8.4 / 10.0
  • Package: 8.5 / 10.0
  • Build quality: 8.5 / 10.0
  • Fit: 8.5 / 10.0
  • High range: 8.5 / 10.0
  • Mid range: 6.0 / 10.0
  • Low range: 9.0 / 10.0
  • Less distortion: 8.5 / 10.0
  • Communication quality: 9.0 / 10.0
  • Active  noise canceling: 8.5/10.0


  • Want to see the score ranking? Click here!


Basic Specifications
  • Continuous / maximum playback time: 6.5h / 30h
  • Waterproof performance: IPX4
  • Supported codecs: SBC



The Sudio E2 package meets the price standard.


Package contents

There is no shortage of accessories. The package contains the following:

  • Sudio E2
  • Charging case
  • USB Type-C cable
  • Eartips (5 sizes)
  • Manual


Build quality

The build quality of the Sudio E2 is well worth the price. The matte-textured case feels smooth, gentle, and comfortable in the hand.


Sudio E2
Sudio E2

Sudio E2



The fit is good.


Sudio E2
Sudio E2
Sudio E2
Sudio E2


Connection quality

I tested it by connecting it to a Cayin N6II/E02 with AAC.


I don't know because I haven't been in crowds, but it is stable in the home. Distance tolerance is excellent, and the connection is seamless and intact even at a distance of about 5 meters. The sound is momentarily interrupted when there is a barrier between us, but then it returns and we can hear the music consistently.


There may be a small amount of white noise, but most people probably won't notice it.



Power ON Open the charging case lid and take out the earphones
Power OFF Store earphones in charging case
Pairing Automatic pairing mode if no connection is available after the earphones are turned on
Play song Tap multifunction button once
Stop playback Tap multifunction button once
Forward song Tap the multifunction button on the right ear twice
Back song Tap the multifunction button on the left ear twice
Volume + Tap the multifunction button on the right ear three times
Volume - Tap the multifunction button on the left ear three times
Answer a call Tap the multi-function button once
End call Press and hold the multi-function button for 2 seconds
Reject call Press and hold multi-function button for 2 seconds
Spatial audio mode ON/OFF Press and hold multifunction button on left ear for 2 seconds
Switch between ANC mode and transparent mode Press and hold the multifunction button on the right ear for 2 seconds

REW Frequency ResponseSound quality

Sudio E2


Sound quality description

The following review was tested on a FiiO M15 with an SBC connection.


The sound signature of the Sudio E2 is V-shaped with an emphasis on depth. By default, the sound has a wide sense of depth in the midrange, but it tends to sound cramped and not very audiophile-friendly due to poor transparency and a sense of ceiling in the high frequency range. However, when the spatial audio mode is turned on, the sound field sounds extended, providing a highly immersive experience. For the actual effect of the Spatial Audio Mode, please refer to this article on Recording Signatures.


Please see here for detailed reviews on sound quality.


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


Sudio E2's spatial audio mode is very interesting because it makes music sound three-dimensional. However, it seems to add reverberation and other elements to the music, and some songs may sound oddly unnatural in texture or have a distorted sound image.


And the E2 without spatial audio mode is below mediocre sound quality for its price range, and I personally do not recommend it at all. By standard, the Sudio T2 gives a much more wonderfully balanced and resolved sound.


Sound quality features
  • Sound with a sense of depth
  • Low frequency range full of realism
  • High sense of definition
  • Highly immersive spatial audio mode


  • Sounds cramped when spatial audio mode is off
  • Resolution is not good
  • Muddy and dull sounding midrange
  • Spatial audio mode works unnaturally with some songs


General comment

The main attraction of Sudio E2 is its unique spatial audio mode. It has the potential to provide a more immersive sound experience. ANC performance is also quite decent for its price range, and it has a full range of features, including support for wireless charging. Most importantly, the design is stylish and comfortable to the touch.


However, if the spatial audio features do not appeal to you, you may recall that the Sudio T2 is cheaper and offers better quality sound and better battery performance.


Sudio E2

Sudio E2

Sudio E2


Coupon Code

Sudio has provided us with a 15% off coupon that can be used on their official shopping site. Please use it for your shopping.