Charles, welcome. The DSP correction as used with the LFR1100s is designed to alter loudness, frequency and phase differences between the output of the front and back drivers. The purpose is to reduce the conflicts between front and back output which occur when those outputs are identical(as they are in some less sophisticated omni-directional designs).
As to some of the other points raised, both theory and personal experience indicate that there's no real audible(as distinguished from measurable)benefit from so-called "high end" DACs and other processors. A great thing about the current audio scene is the availability of electronic components which give us audibly flawless performance at quite low cost.
