Yes, I have read that too, that the AX7e doesn't reach its potential with the RCA inputs. That has to do, in part, with the fact it is a balanced design. Using rca to xlr cable from the Minimax will not change anything-as the Minmax DAC is NOT a balanced design. So, addressing your question in direct terms, you will need a new DAC with true balanced output if you want you AX7e to receive a balanced signal- and make it sound its best (based on what reviewers have said).
