Phase plug, a component within the compression driver, the interface between the diaphragm and the horn.
Phase plugs are machined in metals such as aluminum, or cast in hard plastic or Bakelite.
phase | phase (waves) | Phase-change material | Phase | 2010–11 UEFA Europa League qualifying phase and play-off round | S phase | phase transition | Phase (game) | Laves phase | Three-phase electric power | three-phase | The Plug-In Drug | spark plug | Solid phase extraction | Single-phase electric power | Phase transition | phase space | Phase diagram | Mustard Plug | G0 phase | Another Phase | VESA Plug and Display | Universal Plug and Play | Two-phase locking | Two-phase commit protocol | Tsukuyomi: Moon Phase | Three-phase | The Hitchhiker's Guide to the Galaxy Tertiary to Quintessential Phases#The Tertiary Phase | The Hitchhiker's Guide to the Galaxy Primary and Secondary Phases#The Primary Phase | Telephone plug |