I have a vintage polk sub that i acquired form a friend. Now the only problem is that it does not supply power to the speaker outputs and it buzzes even when i dont have a line in. Would this be something worth fixing or should i just trash it? Im pretty sure the glue is gone off the driver because it also rattles when a line is in. so i would pretty much send the whole thing into polk for repair but i dont know if its worth it to even send it in. how much do you think they would charge me?