Tweeter : 1,75 #34; Horn Type Phase Plug Aluminum, Titanium Diaphragm Midrange : 6.5 #34; Semi-Pressed Paper Cone with Polycotton Sr. Ferrite Magnet Aluminium Phase Plug Copper Short Circuit Ring Midbass : 8 #34; Semi-Pressed Paper Cone with Polycotton Sr. Ferrite Magnet Aluminium Phase Plug Copper Short Circuit Ring Crossover : Optimized 4th order 24 db Acoustical Linkwitz-Riley