You're welcome. There are 3 connection levels with Paul Speltz auto-transformers. Paul has detailed information on his site. If you have any questions about how to use the auto-transformers with your own speakers I am sure Paul Speltz and Ralph Karsten will be glad to respond to your messages.
Actually I do have experience with Paul Speltz auto-transformers with Atam-Sphere M-60. Preamp was SMC VRE-1C driving Acoustic Zen Crescendo with similar efficency as your Raidho. Overall SQ was very good but felt under powered in the bass region.
With the amazing Paul Speltz auto-transformers, one wonders why Atma-Sphere offers M-60, MA-1, MA-2 and MA-3 when all they need is S-30.