How do remove the subwoofer from a 1999 ford explorer Screw are out but will not come out?

The speaker will have a foam gasket between the flange and the mounting hole, which may or maynot be adhesive backed to avoid rattling do to vibration. Pry very carefully and slowly with a small putty kife. A side note: sometimes the woofer does not pop out that simply, some have something else holding them in the box... i do not have an answer at this time since I am also running into this issue there is a bolt behind the unit. it's held in place with 4 bolts