- Absorption is the correct treatment right behind the speakers for sbir, etc. Put some floorstanding GIK 244 or Acoustic Fields ACDA right behind where the woofers are. Other places for absorption.... directly in front of you, directly behind, directly to each side, and directly above mlp (which would help with the strongest lengthwise and width wise, heightwise room mode).
- I assume you like the ’aesthetic’of the skyline diffuser. But QRD quadratic is predictable and sounds better. Acoustic Fields sells all their formulae in a book for 50 bucks or so. Get that book and start cutting wood, glue, nails, etc for all your diffusive needs. There needs to be a min distance between listener and diffusion panel. Side walls between speakers and listener would qualify (ipsilateral and contralateral reflexive spots), back wall if you meet the distance threshold...any spot that’s not directly behind or directly to the side or above, reserved for absorption as noted above.
- Considering the 14ft distance between speakers and mlp, that area rug in front of you is a bit inadequate. You could get a open cell foam type of absorption at specific spots on floor that absorbs lower frequencies than your rug, upon which anyone can still walk on, etc