Toronado, if you go back and review some of my post's you will see that I did try both sub inputs and the regular input that lets you use the volume and crossover worked fine except the volume was at almost full output and I thought that wasn't right. I agree that the idea of bypassing the volume control isn't a good idea, I believe that's one of the reasons that they went to the 4000 series. Like I said, the sub worked fine with the NAD when used with the regular input.