While true, I want to emphasize that studios generally have a great deal of absorption, so reflections are not nearly so dominant as in a typical domestic room. The PIR equation for a studio environment is likely substantially different from that of a domestic room.Definitely - in fact, in many cases off axis sound bouncing off walls will dominate what you hear. If that off axis sound is ragged, so is what you hear.
The KH420 and SCM50 aren't massive but the SCM100 and SCM150 are huge.These midfield monitor type speakers are all not huge compared to typical passive speakers:
The SCM50ASL are still larger at 104,6l compared to the KH 420 at 94,5l. That old-fashined wide baffle speaker is bigger than both of those combined though.