I've had email conversations with Jason on this a while ago for the Bifrost>Asgard>Lyr stack. He recommended RCA splitters and said there shouldn't be audible differences, if any. Done a lot of testing at that time and indeed I observed no sound degradation (from my perspective at least). I imagine it should be the same for the Mini Trinity stack.
Admittedly, I never ran the Lyr and Asgard at the same time. I did test SQ with and without splitters, and the sound was fine with the splitter I used.