Audioengine designs and manufactures our own tweeters, woofers, and many other critical components. In other words, these are not ""box built"" speakers with off-the-shelf parts but entirely custom-designed to our specifications. What we do not fabricate directly in our factory we have custom-made to our designs (parts such as toroidal transformers, magnets, and wiring harnesses, for example). The cabinets, drivers, bass port designs, amplifiers,...