Originally Posted by
Reffc
Extended FR may not be audible but its important as it contains musical information important to harmonics.
I have heard similar things said before and I suppose it makes sense that supersonic information can interact harmonically with (or be created by) audio band signals, but I've never seen it properly explained why this might be beneficial. From what I've seen, it just seems to be an accepted presumption that the inclusion of supersonics information is a good thing.
After all, the Celestion HF1300 tweeter sounds acceptable, yet cuts off dead at 13kHz (and yes, I do know that it was often used with super tweeters).
It is impossible for anything digital to sound analogue, because it isn't analogue!