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It's miraculous that pressure variations on your ear drum reproduce the impression of the orchestra; the speaker just builds on that.

From that point of view a speaker makes perfect sense, and that insight points to an even deeper importance of implicit versions of this transform.

I don't know what that means. But "Two ears = two speakers" must really blow your mind.

FFT is closer to what's going on with Cochlear Implants. Which both suck for some of the same reasons.