The power amplifier and speaker configuration
In the field of professional sound reinforcement, audio equipment, the configuration is very elegant, in which the power amplifier and speaker configuration is the most important, though, a number of speakers to the product instructions recommended by the user with a specific grade or model of amplifier, but still has its limitations, because users are often faced with many types of power amplifier, unable to start with.Amplifier and speaker configuration involved in many aspects, such as grade amplifier, power tube type selection and low sensitivity speaker amplifier, etc. which should be configured. Amplifier and a speaker to a specific configuration, generally with the designer's experience, hobbies, listening habits and other factors, it is difficult to find a uniform standard. Sometimes we encounter a number of users or designers often in order to cut costs to the smaller power amplifier speaker configuration, some users have for so-called "power sufficient reserves" to the big power amplifier speaker configuration. Obviously, this is inappropriate. Importantly, such a configuration would result in damage to equipment. In the amplifier and speaker configuration, the amplifier power is really the key, that is, the determination of the principles of power amplifier should be unified.As we all know, making hall acoustic design, you need speakers according to a series of calculations to determine power, and then determined by the speaker power amplifier power, but exactly how the matching between the power to achieve the best match it?First of all, in human ears domain 20Hz ~ 20kHz, the actual concentration of a large number of the signal energy of music in general, the lower band, while the high frequency energy is only the equivalent of middle and low frequency energy, 1 / 10. Therefore, the general loss of power speaker treble is much lower than the woofer in order to balance the high bass; while amplifier is like a current modulator, its input audio signal under the control of the output current to the speakers of different sizes, so that the occurrence of the size of different voices, to a certain impedance conditions, to get a nominal power of 400W or 200W power amplifier to achieve several times the output is very easy, just power amplifier distortion (THD) will be greatly increased, this distortion mainly arise in , the low-frequency signals in the high-frequency harmonics, the greater the distortion, high-frequency harmonics, the greater the energy, and these high-frequency distortion signals will be in conjunction with the high-frequency music signal into the pitch head, which is why a low-power amplifier push Great speaker tweeter burn will occur the first reason. In many people's concept, as long as the big power amplifier, it may burn speaker. While some power amplifier distortion, instruction, equipment configuration has been due to congenital deficiency, distortion may occur when in use, when the instructions have lost their meaning distorted. Moreover, since the user experience and quality constraints, power amplifier distortion is often easily ignored.Secondly, the power amplifier and a speaker configuration and objectives of the use of loudness as well as in situations where there is a certain relationship. In a certain target loudness, should allow the dynamics of music signal equipment with each piece can be fully guaranteed, if too much amplifier power, its gain is set very low, loudness has reached the requirements, but then limits the amplifier gain the signal dynamic range. Therefore, the amplifier power can not be too large; otherwise, since the wasteful expenditures, loudness, and music will bring dynamic speakers can not take into account, as well as the trouble of overloading. Based on past experience, the general language, music venues and large dynamic amplification of Disco, etc.