Thanks Paul - most interesting. Really neat looking. What would you say it does to the sound?
Sadly, my CLS panels are 20 inches wide, so I won't be able to do anything quite like that. I'm thinking of getting a couple of strips of wood, painting them black, and using those as a 'frame' to attach a vertical line of 3 15 inch tiles to. Should then be able to stick this to the rear of the CLS frame with black electrical insulation tape. Anyone got any better ideas?