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RE: Here you go

Localization is largely a matter of transient perception which are very short events like a breaking branch or a crunched dry leaf. They do not have pitch information - and where we can distinguish localization down to 10us of ITD - and better than 0.5degrees of the horizontal arc for clicks and note onsets, our pitch hearing (sine wave) localization is as bad as 15 deg of the arc. So in those terms spatial resolution is 30 times better for transients than pitch. But we also use phase and timing differences in pitch to obtain depth or distance perception like from floor bounce.

Transient hearing is mostly concerned with very short transients due to onset of sound before pitch develops, typically they are single sided positive pressure high slew spikes followed by relaxation and are 10-30db stronger than the steady state sound that carries pitch. Rise times go from 10us (0.01ms) for some percussion and brass (also have the greatest crest factor) to 200us for bowed strings, which also have a continuous string of transients which are part of the tonal texture.

We perceive the pressure event straining the cilia along the cochlear spiral and time the pressure wave going through. The cilia don't resonate (yet) and since the delicate small high pitch ones are at the end of the path, their stiffening up and lack of ability to resonate only affects transient perception mildly and more so for small ones than for note onsets of loud instruments.

Because the time scale is so much shorter than that of our pitch perception and it is mostly about timing, then group delay in speakers and feedback in amps can smear the transients or cause them to fall out of time. Low pass filters also affect them - but for 1st order linear phase ones where the time aligned drivers will preserve the transients. Apogee and Eminent Tech chose to leave the mids without a low pass and ease in the tweeters at a high frequency, I do the same now in order to preserve the spatial performance of the Neo8 line array on its own without missing the sparkle and extension of the ribbon. ..

CD resolution misses on the shorter transients and mistimes them with wrong rise times and smearing from the prefilters. Analog, and particularly direct to disc does a better job of preserving the transients DSD and 24/192 are pretty much sufficient to give some differentiation between note onsets of an ensemble. Sony touted this transient performance in its marketing of DSD for archiving and later as SACD.

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