Since the audio system is used to play music, the functional quality is the loyalty to music. Without a device to measure loyalty, you can only use your ears to compare real live music.

Orchestral music has the widest frequency domain. It will have the broadest meaning for evaluating functional quality, and it is also the easiest to distinguish quality differences.

Here, the Tai Chi backup CD can help the player obtain the correct data, thereby restoring the real micro dynamic density.

The original text is written in Chinese and the English version is translated by Google.
If in doubt, please refer to the original text.


Functional Quality Assessment

Here, we introduce how to use Tai Chi backup CD and WRT Cable to evaluate the functional quality of the audio system. The purpose of this evaluation is to understand how wide the range of the audio system can be improved to achieve accurate playback of the music played by the orchestra and close to the sound effect of live listening.

Tai Chi backup is to move the original CD data to the CD-R. This process uses the low-jitter processing and Cyclic Unidirectional Technology developed by us. The data on the CD inevitably contains jitter. Reducing jitter and resisting the effects of these jitters is a way to improve the quality of digital music. Cyclic Unidirectional Technology is to let these residual jitter follow a single direction within a certain period of time. This can effectively reduce the time-domain deviation between the digital bit and the bit clock, and the influence of multiple modulation on the bit clock, thereby reducing the chance of data errors. (Please refer to the CD disc data jitter)

For most CD players, compared with the original CD, when playing a Tai Chi backup CD, the music background noise will be lower, the ambient sound will be clearer and closer to the original real record, and the emotional state of the sound will be closer to LP record. The above sound improvement has been confirmed in the actual use of our various grades of players (although this is the case, we still do not rule out exceptions. If you have a more accurate player, please share the information with us).

Before evaluating the functional quality of the entire audio system, we must first examine the quality of the CD player. This is to examine the ability of the player's servo system to resist the jitter of CD disc data. This ability affects the emotional state of the sound and the density of details.

In a quiet period (such as after 10 pm), use headphones to listen to the sound of the CD player to compare the sound effects of the two CDs (original and Tai Chi backup). This method is easy to accurately identify the exact quality of the CD player.

Because the data of the two CDs are the same. Therefore, in an extremely accurate CD player, there will be no difference in sound quality between the two CDs. In actual comparison, the degree of difference in sound quality between the two CDs corresponds to the ability of the CD player's servo system to resist data jitter on the CD.

The degree of difference in sound effects is related to the accuracy of the player's servo system. Different quality players will have different levels of sound improvement. For some players, if the internal analog circuit has strong micro-dynamic filtering, the improvement may only be the emotional state of the sound.

If the sound effects of two CDs are the same (music background noise, ambient sound and emotional state of sound), your player will be a perfect signal source.

After identifying the CD player, we can evaluate the functional quality of equipment other than the player. One point is more important. To clearly distinguish the emotional state of the two CD sounds, the audio system needs to use the WRT Cable.

Generally, the linearity of audio equipment (various distortions of audio equipment will eventually be reflected as linear distortion), CD player (when there is no data error) is the best, followed by preamplifier, and power amplifier (after connecting speakers) is the worst.

An excellent audio system can do this. There is not much difference between the sound heard from the CD player's headphones and the speaker sound (especially in terms of emotional state, there should be no difference between them). The slight difference between them is that the earphone sound has higher transparency, while the speaker sound is fuller and has a better sense of space. This is due to the inevitable reverberation of different degrees in the audio room. In addition to this, the difference in sound quality between earphones and speakers is the range in which audio systems other than CD players can still be improved. In our SFR music playback system, the sound effect of speakers is better than that of headphones. This is because the spatial sense of the speaker sound is more important for live music and singing performances.

Created by Chen
Last revision date: Aug-2019


All rights reserved by Chen Audio Laboratory, Inc.
If any or all of its contents are reproduced, this webpage must be cited as its source.