Both the CXN (V2), and the CXA61/81 use high quality internal DAC's with differing sound profiles. It is worth experimenting with connections between the CXC, the CXN (V2), and the CXA61/81 to see which you prefer.
The CXC can be connected directly to the CXA61/81 using the S/P DIF input, or one of the TOSLINK optical inputs. This will then use the internal DAC of the CXA61/81.
As both digital outputs on the CXC are active at the same time it is also possible to connect the CXC directly to both the CXN (V2), and CXA61/81 simultaneously giving you the option of two separate listening experiences.
Alternatively, to connect the CXC to a CXN (V2) and CXA61/81 using the internal DAC of the CXN (V2):
Connect the CXC to one of the digital inputs on the CXN (V2) using either S/P DIF for a shorter connection, or TOSLINK optical for a longer connection.
Connect the CXN (V2) outputs to one of the analogue inputs of the CXA61/81 via balanced XLR (CXA81 only), or unbalanced RCA.
You will now be able to select the CXC as an audio source on the CXN (V2) for high quality CD playback.