My first impression about Nautilus is small and not powerful than I expected. It has three horn and tip of horns are open and you can see glass wools. It is to reduce interferences. It is "not enclose" "disappear" I think that this shape is fructification of the pursuit of sounds as B&W says. We tried to drive Nautilus by tube amplifiers at first. Sound is very clear. They say High-end speaker is very difficult to drive by amp. But Nautilus is kind of different, it belong to a different category. I'm looking forward to drive Nautilus by many type of amps. It is worth seeing and listening to Nautilus. Please come our shop. I am waiting for you.