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World's best/expensive home stereo system? - worlds best stereo recievers ever

First things first. Do not give me useless answers. I know how to Google or Wiki, so you do not tell me where to look.

I have to compare to stereo systems. I am comparing 2 TVs, 2 projectors, 2 speakers, 2 boats, 2 A, price, size, etc., etc.

The world list of most expensive home stereo systems. Ty

PS I do not want that systems are expensive because diamonds are embedded. They are useless.