This B&W site includes all the service manuals:
http://bwgroupsupport.com/manuals/service#ID_Nautilus800Series
This site shows a parts list for all B&W speakers:
http://bwgroupsupport.com/parts/partslist-bw
Scrolling down to the N805 speaker, the tweeter is $144 (p/n ZZ11266).
Marcus
http://bwgroupsupport.com/manuals/service#ID_Nautilus800Series
This site shows a parts list for all B&W speakers:
http://bwgroupsupport.com/parts/partslist-bw
Scrolling down to the N805 speaker, the tweeter is $144 (p/n ZZ11266).
Marcus