Personally I'd like to at least see a discrete delay for each channel adjustable in 1ms increments.

Phase adjustment for LFE would be nice too.

The 'last mile' - the point where the signal is converted from electrons to pressure is the weakest link and often most overlooked.

I would guess that all distortions and noise combined in the travels from media to speaker input pale compared to those from speaker input to eardrums.

Charlie