I have an '04 focus Sedan and I want more midbass.  I currently have some walmart pioneer 6x8s in the doors but I just bought some MLI65s and some peerless 2" fullrangers and I figured while I am taking the doors apart I should probably fix the giant holes.  My doors look like this: http://www.reversestress.com/other/FocusDoorb4_293.jpg. Well not exactly, mine are red and they still have a bunch of foam on them.  But anyway, my midbass sucks.  How do I cover up these holes so I can better separate the back wave from the front wave?  Oh, and I just bought an SAX100.4 to power them.