What would you say if I told you that the most expensive thing about your system might not be what you think it is? No, I'm not thinking of your listening room, although, from a physical standpoint, that might certainly be true, and it might even be the subject of some future article. It's not your collection of records, CDs, and master tapes, either, even though that, too, might at one time have been the case. Instead, for altogether too many people (not you and I, of course) the most expensive thing about their system is one or more of the mistaken assumptions they might have made in putting it together.