[Home Theater Network HDAV.com.cn] Yesterday, the group discussed the dive of the AV box, impromptu to do a small experiment: the horn generator, the science of junior high school knowledge.
For the pure AV main box, the bass dive is useless. It can be enough to go below 80HZ. The following can be delivered to the gun. The main box is the big dynamic, but also the low frequency can not dry, and the position of the main box. Very few gun positions. And the power is divided, the control of the lower frequency of the motion will produce more serious intermodulation distortion, affecting the effect of the middle and high sound, so the high-end HIFI amplifier is more expensive.
To make the woofer move a lot of current, and to let the moving horn stand up, it needs to generate a larger short-circuit current to prevent the movement, and when the horn is blocked, it will generate current to the medium-high frequency unit.
I recorded a video for you to see how much current the horn cuts the magnetic lines of force:
Wiring method: directly connect the 3 watt spotlight of the LED to the positive and negative poles of the woofer. Note that the positive pole of the lamp is connected to the negative pole of the horn: this can be bright when the picture is taken down, and the light is turned on when it is bounced!
The damping coefficient of the power amplifier directly reflects the control ability of the power amplifier to the horn. The horn is a mechanical and electrical component. When the alternating voltage signal is applied to the horn, the voice coil and the paper cone of the horn will reciprocate, but due to inertia. The role of the voice coil and paper cone will not be banned, that is to say, under normal circumstances, the paper cone will not brake, even if the signal stops, the paper cone will still be free to oscillate, which makes the sound ambiguous. The lower the frequency, the more obvious.
Assume that the internal resistance of the amplifier is very low, which means that when the signal stops, the amplifier will short-circuit the voice coil (inductance) of the speaker, so the movement of the voice coil and the paper cone will stop immediately, and such an amplifier will have excellent transients. The actual performance is that the low frequency is clear and never turbid.
And AV amplifiers, especially the merger machine, entry 30 watts, 50 watts in medium and low, 70 watts in medium and high, 100 watts in flagship! It is impossible to control the low-frequency dive of the large floor box! On the one hand, low cut, on the one hand, increase Power post level!
The power consumed by the ultra-low frequency is more than 80% of the whole. After the low cut, the control power and energy reserve of the AV power amplifier are greatly improved!
For the need for greater driving force and control, the side is handed over to the full-time responsible subwoofer. The subwoofer has some movements with a continuous power of kW and a small internal resistance. But even so, it is not arbitrarily, some guns can be opened to 60DB to ensure control, and some big sounds can be heard directly to 70DB! Some have to reach the extreme taste and open to 80DB or more can not feel the bass Gun distortion is the metamorphosis level:
It is also explained that the control force may also reduce the standing wave: if the room acoustic frequency is not good, if the standing wave frequency is consistent with the horn resonance frequency, the resonance resonance is caused, and at this time, the frequency of the resonance point of the horn resonates due to the standing wave. The amplitude is enhanced, and the power amplifier can not be controlled. At this time, the frequency of the resonance of the horn diaphragm is again applied to the room, causing secondary effects and the phenomenon that the vehicle cannot be stopped. Just explained the phenomenon that the power amplifier changes the standing wave.
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