Point source – Endow's FS301 uses an external passive signal processor to discretely steer various drivers in its hemispherical head array plus the built-in subwoofer. Behind the upper cluster sits an 8" driver which loads it, an approach deemed superior to classic sealed and vented boxes. The head array plays down to 100Hz, there is no filter between 200Hz and 5'000Hz and the embedded technology is patent-pending. Visit their website to learn more.