How to distinguish good sound quality from bad sound quality?

The evaluation of the sound quality of the speaker is mainly judged from the following aspects: it is very important that the timbre uniformity of 1 is in the whole audio range, and the timbre should be uniform. Because the uniformity of timbre cannot be judged subjectively, it can be judged from the following aspects: 2. Round voice: listen to the dialogue and singing of the voice, because most speakers have the problem of intermediate frequency dyeing. 3 bass and mid bass shall not be abnormal. The common problem is that the sound is too loud and too thin. 4 The treble and bass should be bright and supple. Try a string ensemble to see if it is natural, not stinging or dry, but not too sweet or boring. 5 high notes should be clear. Although many sound qualities are rarely included above 13KHz, people can feel them through "overtones". For bass, people feel the fundamental wave, while for high frequencies, people feel the transmission of pulses through the air. You can listen to jazz and pay attention to whether it is boring or vague. Stability of audio-visual positioning: including air sense and sound field depth sense. Audio-visual is probably the most difficult knowledge for a speaker to master, and it is also the most difficult to judge. The reason is that no matter how good the playback effect is, it is far from the actual situation. For the sound image, we should pay attention to its stability and whether the instrument will drift back and forth or left and right when the music frequency changes. Is the sound field displayed between speakers or across the distance between speakers? Or are they all crowded somewhere in the middle? Can there be a natural sense of depth in the distance between human voice and musical instrument? Different types of speakers have different audio-visual characteristics. A dipole loudspeaker, such as an ammeter or an airplane, has a wide sound, but its sound image location is not so accurate. On the contrary, speaker systems with controlled directivity, such as horn type and display type pronunciation, have higher positioning accuracy, but the sound field is narrow and lacks depth. At present, the widely used dual-frequency and triple-frequency speakers are somewhere in between. 7. Dynamic limitation: At present, it is difficult to find a dynamic uncompressed speaker, that is, after exceeding a certain volume range, the speaker will not keep clean and sound uniform in the broadband range. It is obvious whether dynamics is limited. If you hear the bass unit and the midrange unit crackle or hum, or even bang, it means that the strength is limited. In addition, nonlinear response can also cause such problems. For example, the power amplifier is distorted first because of overload. At this time, the speaker can't keep up with the input signal in some frequency bands (mainly low frequency), so the volume is too large and too bright, which will lack the impact of strong transients. It is difficult for ordinary people to judge where the problem of dynamic limitation lies. The more intuitive way is: when the volume is turned up to a certain extent, the sound emitted by the speaker has been distorted, which means that the distortion is caused by dynamic limitation (pay attention to the speaker unit, the speaker amplitude is not very large, and there is no edging, etc.). It shows that the reason of hearing distortion is the power amplifier, and the overload of the power amplifier leads to distortion. If it is the phenomenon that the speaker is edging, it means that the power amplifier has a certain margin and no distortion). 8 low frequency effect of speakers. Even a wide-band speaker can rarely reproduce the bass of 20Hz or 25Hz band, which can be used to audition the frequency. Recordings as low as 40Hz are also quite rare. Only some electronic synthetic music with classical or popular drum music will have such a low bass. But some positioning and room acoustics have great influence on bass.