Calling Vandersteen Subwoofer Users

How'd this work out, I'm having a similar problem with my 2Wq's picking up a slight hum? The rest of the system is dead quite though.

Sorry for the late reply was away for the weekend. Yes I tried all the above before but haven't had the opportunity to try the ground wire yet. Will try before the weekend though. My system is dead quite until I plug in one or both 2Wq's.
I guess I need to update my profile. I now have a VPI HW-19 Mk IV. And the hum was still there before I hooked up the phono amp. Also on the same note I never experienced the Grado hum with my Rega.
Thanks for the input and will post my finding.

John Thank You for the advise.
Sorry to have taken so long to report back, got a little busy over the past two weeks. Was able to get all the testing done and the 2Wq's are still humming. Good news is the Grado/VPI are not the source, with it completely disconnected (power and interconnects), the hum is still there. Tried connecting everything to the same phase leg, with and without a ground wire and the hum seemed to get worse, the ground wire didn't help at all. Disconnected all components to see if any were causing the problem, found a worse ground loop when the AVR was connected, was able to correct that but with the AVR disconnected the front speakers were dead quite, connected the 2Wq's and the subs started to hum. Funny part is they are not as loud up close as they are when the two combine between the speakers. Good thing is you can't hear it while the music is playing. Guess this is something I'll have to live for a little bit. Anyone have any more suggestions.

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.

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.