I have received numerous inquires regarding information on the Arno 40s proprietary layered cabinet design. I know that aluminum, wood, some type of polymer, and soft material gaskets are used in the construction, which leads to a total non-resonating baffle without the sense of "deadness" that all metal or stone baffles can produce. Because of this the speaker's sense of aliveness, transient speed, and total clarity shines through when delivering the music.
If you have more technical questions I would recommend you contact the US importer. I know what I hear, but the specific explanation of the layered design is limited to what I have shared above.