Hi
I know that this will sound very strange to you, but I had the same basic set up as you do for about 12 years.
I also made my own RPG Diffusers out of oak ( They would have cost me $8000.00 to buy). The tops were 24x48 and the bottoms were 48x48. I had eight panels, and I mounted them on wheels- They were very difficult to move otherwise. I also used Tube Traps (OEM)2- 16" Rounds one in each corner with a 12" Round sitting on top of it. I also used 9" half rounds on the side and rear walls. Throw in some Sonex in various spots and except for one piece, this was my listening room. That one piece was a 12" round with a 9" round on top of it. After 12 years, I knew the acoustics well. You will never guess where the 12" with the 9"on top was situated. Halfway between your speakers, in front and in between your amplifiers. It really looked ugly.So ugly, that I must have taken the Tube Trap out of that position at least 50 times, only to put it back in the middle again.
I know, it must sound crazy to you but, with the Tube Trap in the middle of the speakers, everything sounded better. The imaging was much better, my system sounded more musical, and voices and instruments sounded more true to life. I never figured out why. Perhaps the Tube Traps blocked the reflected sound waves coming off of the Self made RPG panels from coming directly at me and re directed the waves back to the panels where they would create more imaging deeper in the Sound Stage. They also reflected the waves back at the Tube Traps, which also re-reflected the waves towards the middle of the sound stage.
When I saw your room, it brought back memories- so I thought I would write this to you, so you could see if it, or something like it, also worked in your system.
Enjoy!
Jeff
