Calling all Von Schweikert VR-9 owners

Guys:

Do you know what is an acceptable level of transformer buzz for the VR-9s? The speakers have huge, 1,000W digital amps in the bass cabinets, and I'm trying to get a handle on whether noise should be audible or not--and to what degree. My electricity checks out perfectly, so that's not the issue. I'm listening in the nearfield, and combined with the fact that the speakers are 96dB with the bass boost on, maybe those factors are causing the buzz to be audible--albeit slightly--from my chair (7'+ away from speakers). My room is very quiet, so maybe that's adding to the audibility. I pulled the amps last night, and put Lock-Tight on the transformer nut and silicone on the back plate, but the buzz is still audible, albeit MAYBE a touch lower in level. FWIW, when I put my hand to the back panel, I CANNOT feel any vibration. Can anyone comment or share their experiences? Thanks!