those must be quality woofers because you normally don't see those thick heavy baskets on cheaper speakers , those frames are pretty much standard issue for most car audio subs of the 90's in the 8/10/12/15 inch woofers.even some of the fosgate spp pro series used those same frames and those are very high end speakers from rockford.
as for the radiator , it's job is to actively double the moving mass of the active woofer, this setup is used to allow for smaller cabinet size and the radiator acts as a port to increase spl and efficiency.