I'd like to start modeling my B&W Nautilus clones. I will most likely be making a three way design, rather than the four way of the actual Nautilus. This will consist of the big spiral TL for the bass unit that will not contain a terminus. The mid and tweeter will also be TL, though with a terminus - which seems to be how the real things are set up, though there's some sort of additional mid. I've never done any sort of transmission line designs though, and i was hoping someone could point me to a good book or online resource that'll basically tell me everything i need to know to at least begin my design. I did a search here for transmission line and miraculously didn't come up with anything, and the books i have only speak of TL in passing - focusing on standard sealed and ported boxes instead. Any reading material suggestions would be appreciated. Thanks guys!