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Yes, I'd certainly experiment by placing diffusion panels behind the speakers at or near the corners. If that center diffusion panel is actually 2 panels, I'd use those for the experiment. If that's to your liking, I'd then place an absorbing panel behind the equipment rack in place of those previous diffusors. Now this is nothing more than an experimental starting point, so in the end, your ear will be the final arbitrator.
What I've heard, and found to be true, is ... for cone/box speakers you absorb on the front wall (behind them) and diffuse in the listening space. For dipoles you diffuse on the front wall (behind them) and absorb in the listening space. The side walls also need tabsorption at first reflection points if your speakers have a wide dispersion.Here's what I did. Look at the wood dowel construction I made behind my speakers. I also found that absorbing the center space was better than diffusion there.That construction was based on one I'd seen at an audio show. The best part was they cost me about $100 using Home Depot dowels and a little stain and paint and elbow grease, as opposed to the $4000 the originals cost from some buddist-named company that you've all probably heard of before. Here's the look of the originals.