I also found the mixes for loudspeakers to sound processed and muddied a bit in the high frequencies that would otherwise be providing stereo soundstage cues. There are a lot of good stereo recordings that don't use any DSP and that achieve a better and more natural soundstage in my system.
I got the impression that this DSP processing might benefit systems that are not reproducing accurate spatial cues. The M3 Sapphires, and I assume a number of other good speakers, are terrific at providing the spatial cues in the recording.
It seems as if the DSP processing is using frequency-specific phase shifts to bring spatial cues down into lower frequency ranges (e.g., ≤15kHz), and attempting to make these cues less susceptible to the typical degradations in the playback stream. The result for many audio systems would be imaging that the system previously wasn't able to reproduce, while for more capable systems (that already reproduce the "fragile" spatial cues) the result is not as good as a good stereo recording without processing. That is all just a wild-a$* guess, but the recording definitely sounded off on my system.