I picked up a pair of these at an estate sale. Cheap. Anyone know anything about them? It looks like there is a large hole in the back of them, radiator perhaps? I haven't tested them and can't seem to find a lot of info about them. Tweeters look to be in good shape...woofers need to be refoamed I believe. I'm not sure I can use them...is it worth having them refurbished? (not by me...I haven't the skill).