Synergy 5221 - 07-10 Jeep JK 2/4 Door Front Cage Kit - Manual (Page 38)

58. If desired, paint the speaker bracket at this time, leaving the edge to be welded
unpainted. Reinstall speaker and tack speaker bracket into place.
59. Remove speaker and fully weld at least a 1” bead.
60. Reapply paint to weld areas and reinstall speaker once weld has cooled.
61. Hook up the speaker to the factory wiring and test to be sure speaker is working.