Abstract: An acoustical door comprising an inner core assembly includes a spacer frame having a first set of spacer strips extending along a first direction and a second set of spacer strips extending along a second direction. The inner core assembly further includes first and second core layers positioned within the spacer frame. The second core layer is constructed of a material dissimilar from the first core layer. The acoustical door further comprises a multi-layer skin spaced apart from the inner core assembly. The multi-layer skin includes a sheet constructed of lead. The acoustical door also includes a spacer coupling the multi-layer skin and the inner core assembly around a mutual periphery. An air space is defined within the mutual periphery and between the multi-layer skin and the inner core assembly such that the multi-layer skin is configured to flex independent of the inner core assembly.

Abstract: An acoustical door including a multiple ply core with individual plies separated from one another by intervening spacer networks. The networks provide generally uniform sound damping spaces between the core plies and are glued in position between the plies to bond the core together.