yea the nad has a sub out,you just need a long enoegh cable,http://www.amazon.co.uk/Fisual-Subwoofer-Cable-Install-Series/dp/B00CWZ01O6/ref=sr_1_1?ie=UTF8&qid=1414008321&sr=8-1&keywords=subwoofer+cable
The D7050 has a pair of pre outs, that can be used. Use the app to check how they are setup, you do not want them to be in stereo if you are using them with a single subwoofer cable.