About the Hugo DAC:
As Rob explained, the inter-aural-delay neural network of our brain measures time delays between our ears. It operates at ~4µs for a biological 250kHz sample rate. That's far in excess of Redbook's own 22µs timing. Rob's contention is that a FIR filter akin to our brain's processing power would require 1'000'000 filter taps. That's still beyond current tech. But Hugo's WTA filter already uses 26'368 taps which rely on 16 paralleled 208MHz DSP cores. Hence Chord's refusal to work with commercial chips. Their 150-250 taps are far too low-rent to keep up with the bio DSP of our human brains.
Source
http://6moons.com/audioreviews2/chord/2.html
So we need high res audio (high sample rates more specifically) not for the extended frequency response but to get the timing of transients right, which would improve the sense of depth of the stereo image?
Any research that confirms we are capable to notice ITD's as accurately as the speed our brain cell membranes operate?