Why is the horn distorted?

　　Engaged in loudspeaker (horn) the person OF the industry KNOWS TO HAVE LOUDSPEAKER distortion THIS CONCEPT, BUT specific distortion is what meaning, distortion must be controlled in what scope, distortion cause at what, how to avoid distortion, I am afraid the person that knows is not very much. I will explain them to you today.

　　Loudspeaker distortion is also known as high - profile wave distortion rate. Radiate THE SOUND THAT GOES OUT from loudSPEAKER, RIGHTILY ONLY ADD THE SIGNAL TO REPRODUCE, BUT IN THE SOUND THAT RADIates actually OUTSIDE fundamental FREQUENCY SIGNAL sound, THE SOUND THAT STILL HAS OTHER FREQUENCY appears, MAKE THE voice SOUNDS TO HAVE abnormal feeling, THIS KIND OF PHENOMENON CALLS distortion.

　　The distortion rate must be compared with the quantitative sonic output to be correct, but should not exceed 5%.

　　Distortion is mainly caused by:

　　1 Driving force (current deformation due to uneven distribution of magnetic beam, input exceeding rated input power),

　　2. Support part (flange part of elastic wave and vibration plate);

　　3 Vibration plate piston motion and segmentation motion and other three important reasons.

　　Distortion includes: 1. Nonlinear distortion includes harmonic distortion and intermodulation distortion.

　　2. Transient distortion.

　　A, harmonic distortion: generally caused by the speaker magnetic field is not uniform and vibration plate system nonlinear distortion. Usually produced at low frequency, because the amplitude of low frequency is large, voice coil paper basin, elastic wave and other easy to produce non linear distortion.

　　Within the magnetic gap back of the speaker, not only is there is only the plate thickness corresponding circular magnetic field, in fact exist in the external magnetic field are the same, just the lines of magnetic force is not so dense hair, strong magnetic field is not uniform magnetic field, therefore, there is no uniformity, so the coil movement into the inside clearance, the feeling of inhomogeneous magnetic field, and will cause a certain distortion.

　　B, intermodulation distortion: it is caused by mutual modulation when two signals of different frequencies are added to the loudspeaker at the same time. Intermodulation distortion will cause tone distortion. When the intermodulation distortion is large, the sound quality of chorus clapping and other replays will be significantly worse.

　　C, transient distortion: this is due to the speaker vibration system can not keep up with the fast speed of the electrical signal caused by the output waveform distortion. This distortion is related to the smoothness of the frequency response curve. This distortion is more severe at each resonance point of the plate, which corresponds to the peak and valley of the frequency response curve.

　　Before I had written an article to tell the output power of power put must be greater than the output power of horn, not only can affect sound effect otherwise, and can accelerate the damage of power put. When the horn impedance is higher than the output impedance of the amplifier, the output power of the amplifier will be affected. And when the horn impedance is too low, such as below 4 ohm, the use of power amplifier and rated output power does not match, in this case distortion will increase.

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