Music or sound over 20khz

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Dolby

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Is an amplifier able to output anything higher than this?
So when it comes to tweeters outputting more than 20khz - can an amplifier do it?
Same as the extended frequency of (for example) the old SACD, is it possible?

I had a debate / argument with someone on another forum that believes certain, rather rather strange things ...

1. Anything above 20khz can't be heard and is a waste ...
2. He prefers science and maths as opposed to listening - so every speaker will sound the same with the same specs, barring perhaps materials in a cone
3. He (and others!) can't hear the difference between a R20,000 <> R500,000 system.

I think this argument started because he refers to all audio folk as fools with deep pockets that fall for marketing and hype. I know I shouldn't bother engaging, but point 1. piqued my interest and I hoped the smarter guys here may be able to answer?
 
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