Thanks guys!
Joe: the foams need to be replaced on the J88, on both sides. Need a replacement passive radiator too, you can probably tell from the photo that I've just stuck the rotted radiator to the inside of the grill to fill the hole currently. Hoping she'll sound super amazing when the speakers are all rockin. That J88 is easily the best cosmetic condition box I own, she's like brand new, hence the close up of the controls.
Rock On.