I read an intriguing quote from the RPG product info. If I read
correctly, what they are saying is that pourous absorbers (like
Auralex stuff) doesn't work well for bass trapping on walls/corners
(see below).

Does this mean those big huge Auralex Venus traps really don't work
that well for taming bass/room modes?



RPG corner trap info quote:
"Small rooms often exhibit poor low frequency response with
significant emphasis at modal resonances. They also have limited space
to make acoustical improvements. Porous surface absorption is
ineffective at these modal frequencies, because the air motion near
walls and in corners is essentially zero for these long wavelengths.
RPG® research solved this dilemma by developing a unique membrane
system that converts the high sound pressure fluctuations typically
found in corners into selective absorption in the modal frequency"