It's lowest is 2.65 and highest point is 2 .9 plus the thickness of the plastic I used to form the part, the cone is slightly tilted to clear the dimmer and direct the magnet into the lowest part of the sidepanel . I use Fosgate speakers in my car and they have a 2.875 depth fron the magnet bottom to the bottom of the flange that goes on top of the plastic and they do not hit the side panel,convertible wiring has to be pushed down about 1/2 inch depending on where the relay was mounted, some dimmer switches have to be moved inwards also