Check out this review of the DCI Specialty Audio Hum Eliminator
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Keith, I have had the same problem for a while. I have an Ayre V5x, Calypso preamp and the 3a Sigs with a pair of 2Wq's using a modified Sony Xa777es player. I have found that it envolves the grounding scheme between tubes and solid state. It will drive you nuts.
I have grounded the 2 subs to the preamp using the little knobs on the back of the subs. I have ungrounded and grounded everything in the system at some point. No filters, no hum.
Finally, I unplugged the cables with the amp unplugged, hooked the cables up, turned the amp on and ---no hum. I haven't touch anything since.
I talked to Ayre and Vandersteen with no help. You could plug the filters straight into the Ayre with nothing connected on the other end and it would hum!
I have found using a solid state pre---no hum.
It has got to be some sort of ground thing between the use of a tube preamp and a solid state amp with the filters inserted. Neither component ties the signal to chassis ground and both are true balanced.
Everyone said that using balanced would cure the hum but it hummed with single ended and it hummed with balanced.
Right now, everything is dead silent---no hum whatsoever. I can't say why but I'm not touching anything!
i borrowed a friend's v-5x a few months ago and hooked it up and it hummed so much i can't even call it hum, it was more like massive drone chanting. took out the filters and no hum. loudness of the hum seems to be a little less than usual today even though i removed all the cheater plugs which work but degrade the sound. the hum does seem to have a mind of it's own.