2 way speaker set with x-over.4" midrange with glassfiber/paper cone, 1" silk dome tweeter for flush and surface mount,mounting depth driver 51mm ,cut out diameter 92 mm. TECHNICAL DATA DIN - size 4 inch Mounting diameter 3,62 inch Mounting depth 2,01 inch Nominal power handling (all voice coils) 40 W Nominal impedance) 3 Ohm Number of voice coils 1