As to the comments about "rubber chickens and the mis-information superhighway", I couldn't agree more. But what the writer suggests is the cause is only half right, in my opinion. The whole loudspeaker industry has long suffered from "rubber chickens", most because it is fairly low-tech. I'm not talking about the physics of the matter but rather the construction of the machine itself. It's a simple machine, really, and a working model can be built by almost anyone. It won't throw a rod or catch fire if done improperly. Worst thing it will do is burn a speaker coil or sound bad. So this tends to invite all sorts of types as manufacturers, with varying levels and abilities. This isn't limited to DIY - Look around at the commercial products that have been sold over the years and you'll see what I mean.