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can you blow a speaker from too little power? only smart people please
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<blockquote data-quote="helotaxi" data-source="post: 7075141" data-attributes="member: 550915"><p>Wire 20 D cells in series to get 30V. Then swap the polarity on that battery pack 40-200 times a second and tell me that the cone stops moving. A square wave is still AC. An ideal speaker with zero mass and infinite BL with zero inductance might be able to reproduce a square wave as it appears but a real speaker in the real world can't come close. A low voltage, low frequency square wave might have the cone stop moving at the peaks as the low power does not create the force needed to move the cone to a limit. That's not what we're talking about here. With a high voltage signal, you're going to have cone movement as long as the voltage is applied until you hit a mechanical limit. Hook a driver up to a 30-40V DC source and tell me that it doesn't hit a limit.</p><p></p><p>The power of the signal determines the amount of force moving the cone which determines the level of excursion. The reason that a speaker approximates the signal fed to it is that the force and thus acceleration are progressive as the waveform builds and then decreases. The motion of the cone lags the signal as well based on the inductance and cone inertia. Once the input waveform is not approximately sinusoidal the cone movement no longer looks like the wave form. Think about it, the cone cannot move instantly from one excursion limit to another which is exactly what it would have to do to match a square wave. Additionally, the inductance of the coil also smooths out the hard corners. The result is that the cone movement still approximates a sinusoid unless a mechanical limit is reached.</p></blockquote><p></p>
[QUOTE="helotaxi, post: 7075141, member: 550915"] Wire 20 D cells in series to get 30V. Then swap the polarity on that battery pack 40-200 times a second and tell me that the cone stops moving. A square wave is still AC. An ideal speaker with zero mass and infinite BL with zero inductance might be able to reproduce a square wave as it appears but a real speaker in the real world can't come close. A low voltage, low frequency square wave might have the cone stop moving at the peaks as the low power does not create the force needed to move the cone to a limit. That's not what we're talking about here. With a high voltage signal, you're going to have cone movement as long as the voltage is applied until you hit a mechanical limit. Hook a driver up to a 30-40V DC source and tell me that it doesn't hit a limit. The power of the signal determines the amount of force moving the cone which determines the level of excursion. The reason that a speaker approximates the signal fed to it is that the force and thus acceleration are progressive as the waveform builds and then decreases. The motion of the cone lags the signal as well based on the inductance and cone inertia. Once the input waveform is not approximately sinusoidal the cone movement no longer looks like the wave form. Think about it, the cone cannot move instantly from one excursion limit to another which is exactly what it would have to do to match a square wave. Additionally, the inductance of the coil also smooths out the hard corners. The result is that the cone movement still approximates a sinusoid unless a mechanical limit is reached. [/QUOTE]
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can you blow a speaker from too little power? only smart people please
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