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) ACEFAST T3: Warm listening sound with emphasis on the midrange. Mellow, transparent and fresh midrange is attractive.






  • This review is based on a sample provided by ACEFAST 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 like mild and mellow sound
  • People who often listen to chamber music or small JAZZ
  • Sensitive to high frequency stimulation


Overview of ACEFAST T3

This review will give an overview of ACEFAST T3. A complete review of this product can be found here.


audio-sound Score

  • Total Score: 7.8 / 10.0
  • Package: 8.0 / 10.0
  • Build quality: 8.5 / 10.0
  • Fit: 8.5 / 10.0
  • High range: 8.0 / 10.0
  • Mid range: 9.0 / 10.0
  • Low range: 8.5 / 10.0
  • Less distortion: 9.0 / 10.0
  • Communication quality: 7.5 / 10.0


  • Want to see the score ranking? Click here!


Basic Specifications
  • Continuous / maximum playback time: 5h / 30h
  • Waterproof performance: IPX4
  • Supported codecs: aptX / AAC / SBC



The packaging of the ACEFAST Crystal T3 meets the price standard. It is made of paper and has a simple but solid construction.


Package contents

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

  • ACEFAST Crystal T3
  • Charging case
  • USB Type-C cable
  • Eartips (3 sizes)
  • Manual


Build quality

Build quality is at a very good level considering the price.






The fit is good. Small ears probably won't be a problem.




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 at a distance of about 5 meters. When I put a barrier between us, the disconnects became worse, making it difficult to hear music consistently.


There may be a small amount of background 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/Stop song Tap multifunction button twice
Forward song Tap the multifunction button on the right ear three times
Back song Tap the multifunction button on the left ear three times
Volume + Tap the multifunction button on the right ear once
Volume - Tap the multifunction button on the left ear once
Answer a call Tap the multi-function button twice
End call Tap the multi-function button twice
Reject call Press and hold the multi-function button for 2 seconds
Activate Voice Assistant Assistant Press and hold the left multifunction button for 2 seconds


Sound quality

REW Frequency Response



Sound quality description

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


The AceFast T3 is tuned to sound neutral while bringing the midrange to the forefront. Both highs and lows are tuned to sound mildly balanced and a bit docile to complement the midrange, so people who are particularly sensitive to high frequencies will like it because it is stable and comfortable to listen to. On the other hand, the sense of construction is weak and the three-dimensionality of music tends to be a little less clear.


Please see here for detailed reviews on sound quality.


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


AceFast T3 has a full midrange sound balance, with the mellow midrange taking center stage.

The high frequency range is slightly backward from the midrange overall, and seems to be adjusted for those who are sensitive to high frequencies. The low frequency range is also adjusted to enhance the mid-range, taking into consideration the quantitative balance between the mid-range and the low frequency range. Therefore, while the midrange is monitor-like, there is no element of sounding tight like monitor earphones, and the overall sound is a little softer, calmer, and rounder. It seems to be a good tuning for entry-level earphones.





Sound quality features
  • Mellow
  • Proper focus on the midrange
  • Excellent resolution
  • Harmonic
  • Mild and mellow
  • Chic and elegant
  • Calmness
  • Lush


  • Lacks a sense of construction
  • Easily blurred
  • Lacks high-frequency extension
  • Lacks low-frequency extension
  • Lacks a sense of immersion
  • Sounds easy to sound cheap


General comment

The AceFast T3 allows music to be heard with a mildly less stimulating atmosphere, especially in the midrange. The sound is less unpleasant and suitable for beginners of earphones. It is also suitable for those who prefer small, calm Jazz and chamber music, as it allows them to enjoy music such as chamber music with a mellow, smooth, slightly calm and elegant atmosphere. It is also good for those who are sensitive to high frequency stimulation. In terms of specifications, it is adequate for introductory use, but we are a little concerned only about the communication quality.


AceFast Crystal T3

AceFast Crystal T3