Calling Vandersteen Subwoofer Users

I guess I need to update my system on here, its way over due.
The AVR is a Denon AVR-4308 and the preamp is a McCormack TLC-1 Deluxe with SMc Audio Ultra upgrades. The amp is a McCormack DNA-1 Deluxe with Gold upgrades and Jensen input transformers,soon to be replaced with McCormack 0.5 Ultra Plus monoblocks. Their in the shop now. I route the AVR thru the TLC, and just turn the TLC volume all the way up. The TLC has a Shallco step attenuator for the volume control. I just turn the volume down when I want to listen to a CD or turntable.
The AVR nor the cable box are the source, with them disconnected from the TLC the hum is still there (the cable box routes thru the AVR). There is no hum in the 3A Signatures just the 2Wq's.
John, does Mr. Vandersteen still recommend the 2Wq's if your using the 3A's in a home theater set up?

I hope the OP doesn't mind me contributing to his thread since we both seem to have the same problem.

OK
This is starting to make sense
First try unpluging any inputs into the 2WQs and see if you have hum.
If the hum is gone without anything pluged into the subs you have a ground loop in the system
Passive pre amps can have a high output imp this could be the source
you can try to ground the shell of the passive pre amp to the subs ground lug with a simple ground wire
Please let me know how you made out.
Cheers Johnnyr

Thanks Johnny
With nothing connected to the 2Wq's there is still a hum. I even went so far as to move the 2Wq's to the other side of the house (one at a time) and connect them there and there was still a hum.

And for what its worth I tried ground wires to the preamp shell with no results.

Also the TLC was converted to a buffered preamp with the Ultra upgrades. Not sure it that makes a difference.