How the amplifier matches the speaker

by:Gisen     2020-03-27
1.Power matching The specific criteria for the configuration of the power of the amplifier and the speaker is: under certain impedance conditions, the power of the amplifier should be greater than the power of the speaker, but not too large. The undistortion rate of the power amplifier in general applications should be about 1.2-1.5 times the rated power of the speaker; in high dynamic situations, it should be about 1.5-2 times. According to this standard for configuration, since it can ensure that the power amplifier works in the best state, and the safety of the speaker, even for inexperienced operators, as long as it is not a serious mistake in operation or the front-end peripheral equipment is not properly adjusted, Speakers and amplifiers work in a steady state. 2.Power reserve matching The power reserve required by a tube power amplifier is different from a transistor power amplifier. For transistor power amplifiers, the selection of power reserve should reach about 10 times the standard of high-fidelity power amplifiers, and civilian high-end power amplifiers are about 6-7 times, and generally have 3-4 times. The tube amplifier can be much smaller than the above ratio. In addition, in order to make it able to withstand the burst of strong pulses in the program signal without damage or distortion, the nominal power rating of the selected speaker should be about three times the theoretically calculated power. 3.Impedance matching It refers to the rated output impedance of the amplifier, which should be consistent with the rated impedance of the speaker. At present, the power amplifiers used in professional speaker systems are generally fixed resistance. Generally, the amplifiers work at 4惟--8惟 at most. Some sound engineers prefer one amplifier to push more than 2 speakers. At this time, pay attention to the impedance of the speakers. When only the speakers are connected in parallel, the impedance will decrease. If it is lower than 2惟, the power amplifier will be easily damaged at this time. This kind of short-circuit working mode should be avoided. 4.Matching of damping coefficients The damping coefficient is the rated output impedance of the power amplifier / the output internal resistance of the power amplifier. Since the internal resistance is actually a resistance component of the sound, the damping coefficient determines the amount of resistance that the speaker can withstand. The larger the resistance is, the larger the resistance of the speaker will be, which will reduce the transient response index. In general, when selecting a home power amplifier, the damping coefficient should be greater than or equal to 40, and the damping coefficient of the tube power amplifier should be greater than or equal to 6. If you want to ensure that the stability and transient characteristics of the playback are not affected, the combination of the iso-mechanical quality of the sound and the damping coefficient of the power amplifier is particularly important. 5. Matching of wires There are many imported fever and nerve wires, costing more than 10,000 yuan, followed by thousands to thousands of yuan. The use of effects is a matter of opinion. A good cable will generally improve the lack of a certain system in the audio equipment. Its transmission theory is too complicated to say and can only be briefly described. The material and structure of the transmission line determine three important parameters, namely resistance, capacitance, and inductance. Do not look at these small differences, which will directly affect the sound system frequency characteristics, damping characteristics, signal rate, phase accuracy, and tone orientation and Sound field positioning, etc. Its main function is high-speed transmission, anti-vibration, anti-noise, anti-interference ability. Matching form of amplifier and speaker The power matching between home power amplifier and speaker is generally divided into three forms: the power of the power amplifier is greater than the power of the speaker; the power of the power amplifier is basically equal to the power of the speaker; The first form is more common. Because the power of the power amplifier is large, when listening to music, they will feel that the low frequency is strong and powerful. At the same time, they can correctly handle the volume of the power amplifier to prevent the speaker from being burned. The second method should be an ideal matching method for ordinary users. Because the power of the amplifier is basically the same as the power of the speaker, the sound of each band of the speaker will be accurately reflected when listening to music. Under normal use (high-frequency, low-frequency boost is not too much, no feedback screaming when singing karaoke), it is generally not easy to damage the speaker. The third method is sometimes used. If the speaker is a 100W 脳 8惟 amplifier, 70W 脳 2 / 8惟 can be used. The advantage of this configuration is that for people who have not been in contact with the audio equipment, the equipment will not be damaged due to occasional operating errors. Of course, this configuration will be slightly softer for enthusiasts.
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