Suppose everything I will say from now on:
We open song-A from youtube(1 computer) in 5 tabs(5 same songs started same time) with same volume.By intrigue and test it will act like same song only played as once with same volume.The volume is not multiplied with 5 times.
In real life think there is 5 identical singers named B(think as copies).They start to sing song-A at the same time with same volume from same location(Think like they are dots binded together so their distance is the same to listener).My intrigue and knowledge says we would hear 5x the amplitude of Song-A so by the fraction of logarithm the sound we hear and our ear processed will increase differently then the computer example. My dilemma is how computer sends 5 song-A to speaker but give same volume as one as different in second example.It might be a thing that is not often thought by people.Can someone explain the mechanism?