While we are on the topic, how about all those wooden violins, cellos, bongos , etc out there? Someone needs to do something about that!
They have to be wooden in order to produce sound. A concrete violin would make very little noise. A speaker box has to be silent. Only the cone needs to vibrate. However that has nothing to do with what we are discussing. The real problem is BOXES, wooden or not. I'd say get rid of all those boxes!