[tremon]

But as long as the EQ effect of the speaker/microphone setup is constant, an AI should have no problem learning how to restore the original.

[TylerE]

Not in the real world where audio bandwidth is limited.

[contravariant]

That's one big if.

[entropicdrifter]

Seriously, the tone can change from just a couple millimeters of difference in microphone or speaker positioning, not to mention the possible variations in room sound due to furniture or other object placement.