Absorption or diffusion????

Hi all, I've been adding some acoustical treatment to my room the last couple of weeks. I am waiting for some of the Auralex Tfusors and Metrofusors which are on order from my local Sam Ash. I have implemented pieces of their Studiofoam 2" pyramids, wedgies and Lenrd Bass traps for absorption. I am thinking of applying some of these on a piece of cardboard and mounting it to the screen of my 50" RPTV via Velcro strips when listening to music. Which should I use over the TV, absorption or diffusion? The TV sits in between my main speakers.
Thanks
Greg