| On Reflection
Those ceiling reflections are luckily quite far away. However, you may have flutter echoes, as I said. I suggest that you test this. I can't imagine that Space Couplers would kill these flutters, surely they would go straight through?, but I have an open mind on that. Perhaps the SC's could be mounted at an angle? Or they could have an absorptive panel above them. This combination is incredibly powerful in tests I have seen.
Do a search here on SC's. I seem to remember that terry? had amazingly helpful DIY construction details.
Those plywood or even hardboard panels could be allowed to sag , creating a diffusive curve. Thin cheap panels should be fine. I have seen such panels in Reverberation Chambers.
DD
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