Most dome drivers have a problem in that they wobble vertically due to usually only having one support, the spider. And I suspect the bigger the dome the more the problem which is probably why there are so few mid range domes. Both ATC and PMC minimize this by using two spiders (ATC even uses two on their 1 inch dome tweeter). Do yu know if Wharfedale uses double spiders.
By the way for me the most interesting large dome driver was one designed in the 70s I believe. It had double spiders and a large hole through the magnet structure. They attached a long rubber tube to the back filled with long hair wool, a transmission line dome mid. I don't think they produced it, unfortunately. John Crabbe, the great editor of Hi Fi News then held up finishing his built large horn system waiting for it and finally gave up and used a variation of the IMF Monitor mid/tweeters instead.
By the way for me the most interesting large dome driver was one designed in the 70s I believe. It had double spiders and a large hole through the magnet structure. They attached a long rubber tube to the back filled with long hair wool, a transmission line dome mid. I don't think they produced it, unfortunately. John Crabbe, the great editor of Hi Fi News then held up finishing his built large horn system waiting for it and finally gave up and used a variation of the IMF Monitor mid/tweeters instead.