I’m not familiar with the cleanbox (although many here love it). Assuming you got the cleanbox pro, the pic I see online has rca in and xlr out. Where were you planning to attach your rca to xlr cable? If you’re using the Minidsp 2x4 or hd you’ll have rca ins and outs. I would definitely run rca cables on the unbalanced side (receiver to Minidsp to cleanbox in) and xlr cables on the balanced side (cleanbox out to amp). I guess you could run the rca to xlr “backwards” since your amp takes rca in, by why not just get the cheap xlr to xlr cables on the balanced side if you can?
SPEAKERS: 3 x DIYSG 1099's LCR; DIYSG HTM 6's and 8's surround; 4 x RSL C34E Atmos; 4 x UM18-22 Mini Marty's.
COMPONENTS: Denon X4400; Minidsp 2x4 HD; 2 x Jensen Iso Sub 2RX; 2 x NX6000d; Epson 5040UB.