Would have been perfect if stereo (directional) bass would have been treated by audysey channel by channel but LFE combined... No idea what they actually do....
I would take a good full range speaker and put it close to the DUT.
A waterfall spectrum of the DUT output while its being bombarded by a 100dB SPL full range sweep would be an interesting test.:cool:
16 bit would give you 1/65536 error in amplitude for each sample.
You are right that reconstruction of in-between samples could in theory have a slightly larger deviation from 1/65536 due to the interpolation.