Why do you want to do a delay test of speakers?Big sound bar sales

　　Everyone knows that the transmission form of sound waves is a sine wave with alternating positive and negative changes. This positive and negative is what we call the phase. The phase of the sound wave is positive during the positive half cycle, and the phase of the sound wave is negative during the negative half cycle. If the sound from multiple speakers or sound sources arrive at the same place at different times, the sound will be blurred and unclean, and the sound will always sound hazy; there may also be different phases of sound waves. There may be one positive and one negative, and the energy will cancel each other. The energy offset is wasted, not to mention, it will also cause a drop in sound pressure. A drop in sound pressure requires an increase in gain, which may lead to level output. Too large will cause signal distortion, damage the unit, cause loss and adverse effects.

　　In addition to providing a beautiful sense of hearing, the sound must be clean and powerful, and we must also ensure the normal operation of professional audio equipment. It is common for the above problems to cause unsatisfactory results or equipment damage, so we must find a way to eliminate such hidden dangers and carry out the delay test and phase adjustment of the speakers. Of course, before making adjustments, we have to figure out what is the reason for the inconsistent time when the sound of multiple speakers arrive at the same place? This article will specifically analyze the causes of this phenomenon for you.

　　Some people may say that low frequencies run slowly, but high frequencies run fast. It sounds reasonable, but it is totally unreasonable. From a physical point of view, the speed of sound in the air is related to factors such as altitude, temperature and humidity, and there is no such thing as frequency. In the same environment, none of the above factors seem to be related. So, what else can cause this phenomenon?

　　The most direct reason is that the placement of the speakers is different, which leads to the difference in the time when the sound wave reaches the same position and the phase is different. In KTV decoration nowadays, basically few people pay attention to the problem of speaker placement, which leads to many problems. This is one of the reasons. Through the adjustment of delay, the effect can be improved to a certain extent. The well-known eight methods of speaker placement are also considered based on such factors.

　　Will the problem of location be solved? Not necessarily, there is another reason, that is, the difference in the structure of the speaker cabinet causes the transmission time of the sound wave to deviate, especially the structure of the ultra-low speaker and the full-frequency speaker. The units of full-range speakers are basically installed on the speaker panel, but some ultra-low speaker units are installed inside the cabinet. The transmission of sound waves must pass through the inside of the cabinet before coming out. It also takes time. Therefore, it will also cause a difference in time. We also need to deal with it.

　　Someone may find that the unit of my subwoofer is also installed on the speaker panel. The sound wave transmission does not pass through the inside of the cabinet. There is no problem with the above two reasons. Why is there still a time difference? Here is the introduction. A deeper reason is the energy conversion time of the horn. We know that the horn is a transducer element, which converts electrical energy into heat and sound energy. We will not discuss heat energy first, but only introduce the problem of sound energy conversion. Does the horn directly convert electrical energy into sound energy? Some friends may say Now, isn’t the horn just an electro-acoustic conversion element? In fact, the electro-acoustic conversion of the horn we have seen is just one end to the end. Electric energy enters and sound energy comes out. In fact, there is an intermediate part of energy conversion, and this intermediate part also contains three energy conversion processes. First, the electric energy enters the horn's voice coil. After power-on, the voice coil moves in the magnetic circuit of the horn through electromagnetic induction, that is, the electric energy is first converted into kinetic energy; then the voice coil moving in the magnetic circuit drives the paper cone to move, resulting in air before and after the paper cone. Vibration, at this time, the kinetic energy of the paper cone that drives the air to vibrate is converted into sound energy.

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