Have you ohmed them out?
I am pretty sure they would be 8 ohms if they are anything from the 800 series or 700 series. But, B&W has been doing some odd stuff with the ohm loads on the 700/low 800 series... (3.1 ohms lowest impedance humpf)
350Hz to 4Khz is also the operating band. With STEEP slopes on the 350. Plus I hate to burst anyone's bubble but these are going to be VERY hard to get much design information on. And if they are designed for the Nautilus tube which I believe they are from the basket, they aren't going to preform that great with out it, since they were drivers and enclosure designed together... //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif