The second problem is the balance between sound quality and sound field
The main thing here refers to the width, height, and focus of the image, which is the "mouth shape" in the old burning words.
To understand this issue at a deeper level, it is necessary to understand how people sing, and the working principles or sound radiation characteristics of some common musical instruments.
The frequency divider can sometimes adjust the directivity, or partial directivity. But this may conflict with the sound quality and tone, and you need to choose at this time.
Of course, you must also consider the mixing of the music file itself and the placement of the speakers, room treatment, and listening position selection. Usually, stereo speaker system, multi-channel system, mono (for example, only the center broadcasts a specific program source, such as human voice) are different.
The old leaders of the previous department attached great importance to the sound field and could optimize the sound field performance at the expense of a certain sound quality and tone performance. In other words, when the sound quality reaches a certain level, sometimes even the tuning will make the sound slightly flawed, but it can be that the image positioning and focusing performance is better, and the sound image drift is reduced. This is usually the adjustment. And this in itself is consistent with Wolfgang Klippel's psychoacoustic experiments 30 years ago. The premise is that the sound quality and tone performance have reached a certain level.
Of course, what I said above has nothing to do with headphones. Moreover, usually a frequency division scheme is only applicable to the corresponding acoustic system. For example, the arrangement of the speaker cabinet/baffle/unit is different, which will affect the sound performance of the speaker due to factors such as diffraction. Therefore, even if it is the same unit, if the cabinet/baffle/unit arrangement is different, it is usually not recommended to apply the same frequency divider-this problem mainly occurs in some "reproduction" schemes in DIY.
There is no absolute perfect speaker, or under normal circumstances, the sound quality and sound field performance of a speaker may have certain flaws or problems, and sometimes the sound quality and sound field problems are difficult to have the best of both worlds, which requires subjective judgment and a trade-off. Although this problem itself exists in the single speaker, it appears more in acoustic systems, such as stereo speaker systems or multi-channel speaker systems. (System Level)
The true meaning of subjective tuning is to choose. People make "strategic judgment" instead of listening more accurately than the instrument, or hearing sounds that do not exist at all, unless it is difficult to directly measure such systems as car audio Acoustic system.
If the subjective tuning of an acoustic system is performed, the adjustment of sound quality and tone may only account for about 20% of the work, the adjustment of the sound field may account for about 30-40%, and the performance of the balanced sound field and tone may sometimes account for up to 50% of the work the amount.