Need advice on digital inputs


Looking for a little advice on something...still a bit new to all of this. I have an NAD c379 preamp and a Cambridge audio cxn100 streamer. I have the Cambridge hooked up to the NAD from the analog outs on the Cambridge to the analog ins of the NAD. Both of these units have good dacs, so having it hooked up like this which dac am I using, the Cambridge or the NAD?? The Cambridge has digital inputs and outputs, the NAD only has digital inputs, how do I use these on the Cambridge unit? Thank you for all and any advice. 

spoonman16510

Fellas if I could bother you with one more question...there is a big difference in volume depending on which input I'm playing the source material on, when using the dac in the Cambridge with the volume set at 50% it is considerably louder than using the dac in the NAD with the volume still at 50%. Any thoughts on this? Again thank you for the help. 

There is an extra gain stage when using the analog output of the Cambridge to analog input of the NAD. Adjust to the same playback level, compare, and use whichever you think sounds better. When adjusted for volume matching they are likely to be very close. If you hear no difference in sound quality, use whichever is more convenient.