Make sure you listen before and after adding room treatments. Sometimes they can suck the life from the music. And never use the foam stuff.
Room treatment
Maybe this topic has been covered already. If so apologies. My room is 14x14 with dormer behind my seated position. I have GK Acoustics corner diffusion bass traps in corners, rectangular absorption panels on sidewalls with some diffusion having some small standing book cabinets, and CD cabinets along sidewall. I'm in the Queue for Magnapan LRS+. Being dipole speakers what would be appropriate for front wall. Diffusion or Absorption.