Calling Vandersteen Subwoofer Users

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.

If you have a cable box in your system disconnect it. That's where I've found my problems before.

AVR? 2WQs
what brand? and do you have Pre amp out and main In?
Bhaaf good advise disconnect the CATV as well
Jr

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