I owned the Acoustic RR-888, RR 777 and the RR 77 for years. And to me, they made the soundstage seem to be larger. Through the years I have changed components and speakers, but I never moved the Acoustic Revive items, until recently...
As I removed the Acoustic Revive units (now with my present setup), I did not notice any change. Perhaps it's because I now have Planar type speakers and room treatment is not as important as with previous box speakers,
I ended up selling them all and frankly don't miss them.
ozzy