Yes, the photograph analogy is good. No one as far as I know in music or film claims that they can improve upon the original recording. This is why the provenance of the recording is so important in remastering. The earlier the copy, the better.
What they can do is to manipulate the original so that it looks/ sounds different. And that’s exactly all what some cables do.
What they can do is to manipulate the original so that it looks/ sounds different. And that’s exactly all what some cables do.

