The sub is a btl I can tell by the magnet. As it is useless to me, its an experiment. About the cooling liquid for computers. Its simply water or in some cases coolants. Yes they are non conductive. So is LN. Nitrogen is mostly non conductive. Also not impossible, I just need to study the driver a little, and design a method for the extream cooling . I was listening to the sub in a loud speaker case, and it sounds preety nice, but for any car/home, I would want the 15-18 model.