I would strongly recommend against buying from anyone on eBay, lots of people who claim to be guru's but just copying other peoples hard work, too many people like that kicking around. It's very easy to build a speaker XO but it's not so easy to see how it would work with your speaker cabinet. Stick with Paul @ RFC, he has a very well known track record with Tannoys. He has very intimate knowledge of the various tannoy cabs and their "habits" . I've got Paul's top spec for my 15" MG's and I would not use anyone else. You might be paying more, but consider the old saying, buy cheap buy twice.