The speakers are not tired, they are sunburned and toasted. The door speakers are shielded from the sun pretty good, but the deck and dash speakers have paper cones and surrounds and the UV light and heat cooks them to pieces and the extreme heat sometimes even melts the speakers off.

So, stereotypically, most Volvo owners listen to NPR or Classical music and you don't have to worry about blown speakers from someone listening to Snoop Dogs "gold toothed gangsta". Your door speakers should sound as good as the day the car was new.

To remove the door and dash speaker covers, you just need a small flat head screwdriver. They just pry up and off. The dash speakers are held in place with push snaps.....(you push the center of the button in to release) The door speakers with large torx screws, and the rear speakers are bolted in with 7,8,or 10mm bolts. You will need a 1/4" rachet and deep well socket. I thought the deck speakers were 6X9". Anyway, pop the deck and dash speakers out first and inspect for damage and replace.......