In my opinion, before you expect room correction to "level the playing field", you should be aware that there are two things DSP cannot fix:
1. DSP cannot correct the dynamic limitations of a loudspeaker. It cannot make the motors handle more wattage before overheating, and it cannot make the voice coils travel further before going into over-excursion.
2. DSP cannot improve the radiation pattern. For example if a speaker has a lower treble over-emphasis because the radiation pattern is very wide at the bottom end of the tweeter's range, thereby putting out too much energy into the reverberant field in that region, the best you can hope for is a compromise. If the on-axis and off-axis responses differ significantly, you cannot fix them both at the same time via DSP.
My point being, if you're going to rely on DSP, then make intelligent initial choices in these two areas because DSP can't fix them.
That being said, it is quite possible for a standmounts-plus-subs system to outperform many floorstanders. It depends on the specifics - there is a lot of variation possible. Sometimes standmounts-plus-subs is the configuration of choice, rather than the configuration of necessity.
Duke
dealer/manufacturer