NAD 7400

I have this receiver which I like a great deal. I wonder if there is a way to use a sub though there is no specific out-put for this. Thank you.

Yes, there are a few different ways to use a sub with the NAD7400. To determine the best way, it would be helpful to know what speakers you are using, and what brand/model sub you have or wanting to purchase.
I alternate between pairs of Tetra 120u and Silverline minuet Plus.