I always wondered about the speakers that were under the seat. They were marine speakers. The face comes off then they were screwed into the floor. Half the screws were rusted too
Had to vice grip them out and whoever put them in drilled a hole in the bracket that attached to the floor and put the wire through the hole then put the spade attacher on.....so I had to cut the spade attachers off the wire.
I'll probably put them back in along with speakers behind the seat.