Can the Mic be eliminated by sum and difference?

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what you want is for the signal coming out of the FRFR to be the exact same you'd hear standing in front of a real guitar speaker cabinet. but the way to do that is to use that real guitar speaker cabinet and listen to it in person. how can you capture the sound of that speaker without a mic? there's just literally no physical way to do that. it's the same way that you can't take a picture without a camera. something has to capture the image.

I'm just spitballing here, but couldn't this be done with holograms, magnets, HD, or possibly the internet?
 
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