Denf, I have my electrostatics pulled out about 6 feet from the back wall and still prefer diffusion treatment even at that distance. I use a knock off of the original RPG. Mine are buried in the wall with an acoustically transparent cloth cover so they are not visible.
I also use four tube traps, great for tuning out the bass bump from dumping high SPL into the corners. If you want to see the RPG treatment before it was covered, click on "system" link in my post. Good luck with your project.
I also use four tube traps, great for tuning out the bass bump from dumping high SPL into the corners. If you want to see the RPG treatment before it was covered, click on "system" link in my post. Good luck with your project.