Sound Power Question: How Much Energy Is Needed?

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Sound power is measured in watts, with examples like a jackhammer producing around 120 dB at approximately one watt of sound power. To artificially create sound at a specific decibel level, more energy is needed than the sound power output due to inefficiencies in sound generation. For instance, a rocket engine at 180 dB might require a million watts of input to produce that sound power, as no speaker operates at 100% efficiency. Additionally, even virtual sound generation through speakers necessitates significant power to achieve high decibel levels. Overall, achieving high sound power output demands substantial energy input, often exceeding the sound power level itself.
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Hi Guys,

I know that sound power can be measured in watts. For example a Jackhammer is around 120db which would produce a watt of electricity.

My question is, if I wished to artificially create a sound at the same db would you have to put in as much energy?

For example... if a rocket engine at 180db produced a potential of a million watts, if I wanted to artificially create this decibal volume would a million watts of energy have to be put into it to generate it?

Thanks guys!
 
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Yes, and more. You can't create sound with 100% efficiency, so you'll need more. The jackhammer makes heat and breaks rocks while it makes sound so it may require dozens or hundreds of watts to make one watt of sound.
 
What if the sound is produced virtually? computer-generated and put through a speaker big enough to artificially create the sound power of 180db? would that be using more power output?

To my mind, to do it the way I just put it wouldn't need a million watts or more to generate the sound power of 180db.
 
No speakers are 100% efficient, so if you want to make a million watts of sound power, you need at least a million watts of input.
 
Thanks very much for the information guys! very useful :)

on a final note, in which way must things be 100% efficient?
 
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