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Avoid Distortion How to configure the power amplifier for better results

Power amplifier to some extent dominate the whole system can provide a good sound quality output. For many of my friends, the amplifier is not very understanding, do not know in the amplifier speakers, what accessories are required to configure, in order to play the effect of the amplifier to a better state? A: that is, under beats headphones on sale the speaker installed A resistance to do the current sampling, in fact, feedback back or the voltage signal is analog current feedback, do most people, but this circuit is flawed, there are two reasons: his output gain will be with the impedance Change and change. As a result, the voltage applied to the horn 2 is not constant, as if the power applied to the horn can be constant. But do not forget, the sound pressure curve of the speaker is in the constant voltage output under the TEST ah, so this circuit is not a good sound, listening bad, beats headphones cheap fun only, but there are improved circuit to voltage negative feedback Mainly, plus the amount of this type of current negative feedback, it touches can make a good sound, but the role of current negative feedback is to change the damping coefficient of the amplifier, the amplitude and frequency characteristics of little effect. Is the sampling point in the speaker below, the speaker is an inductor, the current flows through the inductor its phase will change, low frequency okay, high frequency can be phase shifted 90 degrees, phase characteristics of the poor. The second: negative resistance amplifier, in addition to in some special occasions, one for sound and success is YAMAHA, its main role is to extend the low frequency has a very good effect, but the frequency of more than 200Hz Will play the effect of deterioration of sound quality, it is generally used in ultra-low frequency active speakers. In fact, this circuit is used with the speaker, there is no practical use of the meaning alone. Its working principle is: If the speaker is a rigid body, then add a tube, you can become an ideal Hall Mozi resonance box, then no matter how the size of the box, how the thickness of the tube, as long as the Hall Mo Mo resonance Calculation formula. Even if the 20Hz resonant point can also be done to the size of the box, but the efficiency of the level only, because the speakers on the presence of speakers, speakers in the sound when the movement is not a rigid body, then the box will not produce Hall Mozi resonates.

Therefore, if the sound of the speaker when the diaphragm is still stationary. So, the box is close to the rigid body, you can meet the conditions of Hall Mozi resonance, you can design the box of the resonance point. The sound of the speaker when the work is not a negative power amplifier task. Negative impedance amplifier works when the speaker in the low-frequency work, the impedance characteristics of the rapid changes in the amplification circuit through the current sampling to take this change out to the amplifier, so that the amplifier in the form of current control speaker, if the amplification Circuit equivalent analysis, can be found in the internal resistance of the amplifier in the calculation of negative resistance characteristics.

In the dynamic amplification of the speaker when the amplifier makes the internal resistance beats by dre close to 0. As a result, this circuit makes the damping of the loudspeaker in any direction. As long as the sound to the end, the speaker does not move, the box will become rigid beats headphones cheap body.

The third: current-mode feedback amplifier circuit, this is the practical current amplification circuit, but also the real current-type negative feedback, the feedback signal is the current, not the voltage, that is not added in the negative feedback, but to join , There is current into the. This circuit is the first in the video transmission, or equipment like oscilloscopes on what a lot of use.

Because of the low impedance negative current feedback input of this circuit high frequency characteristics of good, capacitive load drive capacity super, as long as the improvement, and found that the power amplifier is very good, you can make up some of the voltage amplifier lack of congenital, Open loop frequency response is low, closed loop transient frequency distortion, very weak capacitive load drive capability. The disadvantage is that the open-loop gain of this circuit is relatively low, and the distortion after closed-loop is one order of magnitude higher than that of the voltage amplifier.

However, the total total distortion will not be over 0.01%.