The matching principle of power amplifier and audio equipment

　　In the field of professional sound reinforcement, the configuration of audio equipment is very elegant, and the configuration of power amplifiers and speakers is the most important. There are still limitations, because users often face many models of power amplifiers and have no idea where to start.

　　There are many aspects involved in the configuration of power amplifiers and speakers, such as power amplifier grades, selection of power tube types, and which power amplifiers should be configured for low-sensitivity speakers. The specific configuration of power amplifiers and speakers is generally related to the designer's experience, hobbies, listening habits and other factors. It is difficult to find a unified standard. Sometimes we encounter some users or designers who often configure speakers with smaller power amplifiers in order to save costs, and some users configure speakers with high power amplifiers for the so-called "sufficient power reserve". Obviously, this is inappropriate. Importantly, this configuration can cause damage to the device. In the power amplifier and speaker configuration, the power of the power amplifier is indeed the key, that is to say, the principle of determining the power of the power amplifier should be unified.

　　We all know that after the acoustic design of the hall, the speaker power needs to be determined according to a series of calculations, and then the amplifier power is determined by the speaker power, but how should the power of the two be matched to achieve the best match?

　　First of all, in the 20Hz~20kHz range of the human ear, the music signal that really concentrates a lot of energy is generally in the middle, low and low frequency bands, while the high frequency band energy is only equivalent to 1/10 of the energy in the middle and low frequency bands. Therefore, the power loss of the general speaker treble is much lower than that of the woofer, in order to balance the high and low frequencies; while the power amplifier is like a current modulator, under the control of its input audio signal, the output size is different It is actually very easy to make a power amplifier with a nominal power of 200W reach 400W or several times the output under certain impedance conditions, but the distortion (THD) of the power amplifier will be greatly increased. This distortion is mainly generated in the high-frequency harmonics in the medium and low-frequency signals. The greater the distortion, the greater the energy of the high-frequency harmonics, and these high-frequency distortion signals will enter the treble together with the high-frequency music signal. This is the reason why the low-power amplifier will burn the treble head when pushing the loudspeaker. In the concept of many people, as long as the power of the power amplifier is high, it is possible to burn the speakers. Although some power amplifiers do not have a distortion indicator, due to the inherent insufficiency of the equipment configuration, distortion may occur from time to time in use, and the distortion indicator has no meaning at this time. Moreover, due to the limitation of the user's experience and quality, the distortion of the power amplifier is often easily ignored.

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