The Rockport Alya's 1.25"-thick front baffle is cast from aluminum, then machined to accommodate the drive-units. The tweeter's usual front-plate is discarded and replaced by the baffle, which has the necessary opening and locating pins. This gives a very clean acoustic environment for the dome. Andy Payor's hand is shown here locking the tweeter into place with a ring that screws into a thread tapped into the rear of the baffle.