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#21
You just posted some general information that any high school physics class would know.
You got 1 fact right, for the transmission of electricity power, they use very high voltage lines to cover long distance. But we are not talking about transmitting power. We are not talking about driving a machine. We are talking about transmitting information.
Also you got the whole concept backward. Sony/Panasonic/JVC/Samsung can pick any voltage they want. Even if you are 100% correct, they would have picked a different voltage to cover a 6 foot cable because customers would have complained about the very short cable that doesn't work for their tv cabinet.
This was how people's tv in their living room looked like 30-40 years ago.
So even if you are 100% right, then the following would have happened.
1) the sales department figured out that they need to give their customers a 6 foot cable or else their customers would complain
2) the engineering department would figure out a 6 foot cable need xxx voltage to carry a clean audio signal
So your theory simply wouldn't even work in the real world.