I hear ya'll on not needing the Babynbox but I'm coming from a stealth setup of MK4/MK41 > Babynbox > PCM-A10 so swapping out the A10 with the FR-AV2 is a good first step. I'm intrigued by the idea of swapping out the Babynbox with a set of CMCs but I'm looking at BH&H (always dangerous) and it looks like a compact set of CMCs start around 1K each, specifically the CMC1 series like the CMC1L. Depending on that configuration you'd need to either go MK4 > CMC -> Cables -> FR-AV2 which might get clunky in a hat or MK4 > Cables -> CMC -> FR-AV2 which would require the KCs and those are like another $400 each. Those cables must be made from the blood of christ or something because that seems insanely expensive. But minimally, unless something popped up in the yard sale, that's another 2K just to replace the Babynbox+cables and I don't want to drop that kind of cash just yet.