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Quick and dirty acoustic treatment. Took the 4 Pi covers that were in the back of the room and leaned them in front of the metal radiator cover that's in between the speakers. The large hard surface is now mostly covered with cloth. It's a win. There's a change in midrange and upper midrange tonality and a tightening up of the bass. There's a bit more depth to the soundstage, too. Neat trick.
As long as quick and dirty gets the job done, the job gets done. It was an innovative idea in that you used what was available to do what you needed to do. And for that sir........good job.