As Vinnie said above, they're Bastanis speakers. I have the Prometheus, not exactly DIY because I bought it all as a kit and just had to assemble the woofer enclosures and do some basic soldering. They're definitely an ideal match with the Sig 30, and I do use a bottlehead phono pre for that little bit of tube magic (no real interest in digital, I do that mostly when I'm using headphones or at work). They were sold by
baulsaudio.com here in the states, I don't know if they still are but I hope so because I still need to upgrade my tweeters.
gary