Room treaments

I love GIK.


From what I’m reading I suggest the following: More diffusion and don’t ignore the floor between/behind the speakers. Lot of hash lives there.

Do bass traps carefully. You can overdamp, leaving you with a lean system, but smoothing out the response is critical to a good system. If you can measure as you go you’ll be in a better place.

If you have no bass resonances, or well controlled one's you are done.

Best,

Erik

GIK is excellent, but I'm using Vicoustic now. Check them out before making your decision. https://vicoustic.com

The ' corner bass traps ' floor to ceiling may introduce issues in terms of balance.
Tackling 20 - 200 Hz will be the most difficult but a relatively low reduction in level should be smooth enough.
Absorption behind the ' mains ' should help a bit as well.
My sense of a rooms ' sound ' tells me that diffusion on the side walls could be a better solution than absorption.
Even absorption on one side and diffusion on the opposite wall at first reflection points - ' A Symmetric ' could be effective.

@fiesta75,

I have explored vicoustic and my experience with them was not good. They rely on dealer network, so you’re dealing with a middle man who may or may not be a subject matter expert. Whereas GIK is direct sales and you are consulting with their in-house room designers. That alone to me is a biggest differentiator! With GIK, you can count on a solid advise, no more guess work on your part.

OK, here we go again....

Go to "At Home," "Hobby Lobby" or other discount home dec store and buy a dozen or more 6' - 8' tall artificial Ficus trees.  Scatter them wall-to-wall between the speakers and the wall behind the speakers.  Then place a tree on each side at the first reflection point.  Place the remaining trees between the listening position and wall behind the listening position.  

Artificial Ficus trees both absorb and diffuse the sound waves.  And they are visually appealing.  No need to spend a lot on small panels in specific locations.  These artificials cost between $40 and $50 each.  So a dozen of them are the same cost as only a few sound absorbing panels and in my opinion are more effective.

My room size is 14' x 24' and slightly irregular ceiling height between 7' 8" and 8' 10".