The Hathor uses the 15pr400 and two 4" mids. Tombowlus compared it to the baer for me by saying that the 1544 was had alot more in the mids, almost making the baer sound scooped in comparison (Im thinking in the 200-800hz range), the baer was bigger down low but, the hathor could be dialed in for that sound. The baer was cleaner, more pristine while the hathor got growly and dirty much easier and seemed to live for that sound. I'll have a pair of Hathors on friday and I may be getting a zoom q3hd to do my first video review. I'd really like to show off my stambaugh bass and gear to some of you guys that I've been talking to for years. This would let me have more of a face to face meeting kind of thing.
Awesome!
Of course, like any other driver, the K140 has its own tone that is still very nice.