I assume I can use both A and B sets?Yes, you can use both A and B.
If so.....from the A section on Receiver say left channel....a run from receiver + to high pass + on speaker and from receiver - to lhigh pass - on speaker? Same for right.
And from B section on receiver the same as above but will be going into low pass of speaker?
The speakers selector on your NAD 7020 Receiver will works as a jumper, you need to switch the speakers selector to A+B.