Audio at 54 Khz by Tannoy

It is true that most of us can hear 15kHz top, but there are harmonic freequencies present in music or any audiable freequencies that will go bellow 40Hz and above 20kHz. Ability to reproduce with presicion these harmonic freequencies will better define a natural sound.

I remember reading a french article claiming proof that we *perceive* sounds beyond our aural limits (through the bones, I believe). If this is the case, wide-bandwidth reproduction is useful: many instruments' harmonics go well beyond the standard 20kHz -- one example being sax (60-70kHz?) -- so why not have them? Likewise, BTW, many instruments' harmonics fall well below their fundamental -- as anyone who has played around listening to the sub alone would know!

Now as to whether such multi-kHz info exists on the s/ware, in the first place, is another matter!

I've read the original articles (I am a neurobiologist) and they are intriguing but not convincing. There are many technical issues which make it difficult to accept that the experimental findings are behaviorally significant. The neurophysiological localizations were particularly strange.