Redbeard, your an audiophile after my own heart. Long ago, on this site, I infuriated a few folks by suggesting that since what the speaker is moving is the air in the room, it should be fragrant to sound better. I even suggested that French perfume was the only thing for products from that country, such as JM Lab Utopias and the like, but that, having Bryston and Canadian speakers from a large manufacturer because of my limited means, that a pine scented air-freshener was best in my case. Insofar as the paint on the walls, obviously the colour of the paint does have psychoacoustic consequences. The texture is very important also, the best being an eggshell finish. You may have a tough row to hoe with this crowd though if you only bring science, technical know-how or plain common sense to the table. Good luck.