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Audio and Video Talk
General Discussion
Educate me, how does an underpowered amp/receiver damage a speaker?
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<blockquote data-quote="windshear" data-source="post: 67130" data-attributes="member: 619"><p>Lets see if i can remember the basics. If you simplfy audio and you take just one frequency, it doesnt matter which one, you end up with a sine wave. Now for arguments sake lets say it has a peak voltage of 1 volt. This is not the same as 1 Volt DC. The industry took a standard of a theoretical factor to get an equivalent of the DC by plotting the signal and getting an average. This multiplier is 0.707 . So if you multiply the 1V AC signal you end up with 0.707RMS. This is the only place where RMS(root means square) should be used in terms of electricity, there is no such thing as Watts RMS. </p><p></p><p>Lets say you have an underpowered amplifier that could output 10V peak. At lower volume the signal peak may approach the limit of 10V and you end up with 7,07V RMS and all is happy. However now you increase the volume to its theoretical maximum, you no longer have a sine wave but a DC signal at 10V for however long that signal is present. This is sometimes referred to clipping. If you translate this into power formulas which i wont do, (they elude me at the moment) ??? You end up with much higher average power to the speaker, which is translated into heat due to the work being done. Heat is never a good thing as the coils can only dissipate so much.</p><p></p><p>With audio, being dynamic and levels ranging from high to low, you could end up clipping regularly with an underpowered amplifier. Now i have just approached this from a voltage side of things, however im sure someone will chip in regarding the current side of things as thats what causes the actual damage. Especially from a DC current aspect compared to an AC one , especially when it comes to thin voice coil wires.</p></blockquote><p></p>
[QUOTE="windshear, post: 67130, member: 619"] Lets see if i can remember the basics. If you simplfy audio and you take just one frequency, it doesnt matter which one, you end up with a sine wave. Now for arguments sake lets say it has a peak voltage of 1 volt. This is not the same as 1 Volt DC. The industry took a standard of a theoretical factor to get an equivalent of the DC by plotting the signal and getting an average. This multiplier is 0.707 . So if you multiply the 1V AC signal you end up with 0.707RMS. This is the only place where RMS(root means square) should be used in terms of electricity, there is no such thing as Watts RMS. Lets say you have an underpowered amplifier that could output 10V peak. At lower volume the signal peak may approach the limit of 10V and you end up with 7,07V RMS and all is happy. However now you increase the volume to its theoretical maximum, you no longer have a sine wave but a DC signal at 10V for however long that signal is present. This is sometimes referred to clipping. If you translate this into power formulas which i wont do, (they elude me at the moment) ??? You end up with much higher average power to the speaker, which is translated into heat due to the work being done. Heat is never a good thing as the coils can only dissipate so much. With audio, being dynamic and levels ranging from high to low, you could end up clipping regularly with an underpowered amplifier. Now i have just approached this from a voltage side of things, however im sure someone will chip in regarding the current side of things as thats what causes the actual damage. Especially from a DC current aspect compared to an AC one , especially when it comes to thin voice coil wires. [/QUOTE]
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Educate me, how does an underpowered amp/receiver damage a speaker?
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