What is the current thinking regarding perception of acoustical signals in the 20kHz to 100kHz range. There is a reference by Rupert Neve regarding perception in the 20-40kHz range, and that he designs his equipment to respond up to 200kHz. http://www.resolutionmag.com/pdfs/MAKER/rupertneve.pdf [end of page 1, start of page 2]. Kevin