Yes you are right.
But becouse somebody cant hear it don't mean the sound don't exist- but agree if a sound is heard by nobody then I guess the sound could not be proved it happened. But the disturbance in the air, the pressure wave did happen.
LOL I love the posts on these forums..
Absolutely, the pressure waves happened, they existed, but pressure waves are not sound, they are what we translate as sound..
To Further clarify though...
Kinda think of it this way.. Radio waves, infrared, and visible light are no different other than their frequency, but since we cannot see the other ones, we do not call them colors or normally include them in light even though they should be. The frequencies we cannot hear are called "Subsonic" or "UltraSonic" Meaning quite literally "Below Sound" or "Above Sound" because without the ability to translate them into sounds they are not sound, they are pressure waves. Now yes, they are sound to certain creatures, but once again it does require the actual hearing of it to become a sound.
Proving it happened is not the requisite for it becoming sound, the actual hearing of it is. IE: Even though they call them "Sound meters" They do not "hear" they simply measure. Sound is a subjective thing and it is entirely dependent upon the observer, or observers, and techniques like perceptual encoding that happens in MP3's allow the same sounds to be generated by different air moment patterns than the original.
An MP3 on an oscilloscope would look VERY different than one from a raw concert or a wave file, and has massively different pressure changes, HOWEVER they SOUND the same, because the compression throws away pressures we can't hear, due to it being near another pressure level and it saves massive amount of space.