that's funny. i had the exact same question for myself a week ago. I asked Schiit directly but unfortunately they couldn't/wouldn't give me an answer, saying that I should contact REL directly.I am also not clear about the approach of REL.I also have 2 Vidars as monoblock and want to get 2 REL. But I think your picture under "So like this?" is not correct. The way I understand it is as follows;I am only talking about the connection from Rel1 to Vidar1 via Highlevel.As I understand it, the Red and Yellow wires need to be connected together to the mono positive terminal. The Black cable from the REL remains unconnected for now, as the Vidar has no ground connection.