Hi Chris,
I agree, it can be confusing.
I will not claim this is all the changes, but the 805S has a first order crossover and the S805 has a 3rd order. Dimensionally they are very close but they are slightly different nonetheless, they do not weigh the same either, with the 805S 5 lbs heavier. What all changed cabinet wise I don't know, but they are different. As for the bass/midrange driver, I don't know if that is the same or not. The binding posts look the same, but the Signatures are silver, they are gold on B&W's previous and current line, I have no idea the difference, if any, between these.
I agree, it can be confusing.
I will not claim this is all the changes, but the 805S has a first order crossover and the S805 has a 3rd order. Dimensionally they are very close but they are slightly different nonetheless, they do not weigh the same either, with the 805S 5 lbs heavier. What all changed cabinet wise I don't know, but they are different. As for the bass/midrange driver, I don't know if that is the same or not. The binding posts look the same, but the Signatures are silver, they are gold on B&W's previous and current line, I have no idea the difference, if any, between these.