The main source of sound quality is the air. No air, no sound. That simple.This is why i use 2 ionizers, and 24 Helmhotz tubes they change the "air", they change the normal pressure zones of the room....
And this is called acoustic....
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What about water ?Wales can hear for miles .Good observation...
Waves need a support....Air or water or ether....
«Fire speak, water cry, air smile, matter dance»-Groucho Marx