Subwoofer hummmmmm

Why not call Vandersteen and get it from the designer's mouth?
Mr. V. usually calls back the next day.
Bob

Dedicated lines fixed hum problems in my system.

I did message RIchard V. He did respond very quickly. Suggested I leave both the NAD and the 2Wq on all the time. Said both would last longer if I did so. The obvious and quick fix. I was just curious as to why it hums.

I am glad to hear Mr. V contacted you quickly. He really provides great service.
As far as the hum goes, it may be your electrical wiring. Something isn't grounding properly.
Perhaps Almarg will chime in. He knows more about such things than I.
Much more...
Bob

One thing for everyone to consider...Only after taking the appropriate safety precautions, open your house electrical service box and check all of the grounds.  In other words, tighten all of the grounds that may not be sufficiently grounded.  I did this years ago after discovering that when I touched the clothes dryer, it hummed.  Sure enough, a couple circuit grounds were not well secured. Tightening those connections brought about an immediate cure of that problem.

I don't know if this will help with the issue at hand, but it is a good thing to check.  Floating grounds does not a good audio system make!