Von Schweikert VR4-JR

Given you say you hear it from ALL tweeters... I suspect you have tried turning off the rears.

the front & rear tweets are different from one another BTW. I'd have to say the thing in common with ALL of them is the crossover. if the connections to the speakers, and from the amps are tight and secure at both ends, it could well be in the Xover...

They are being run biwired, right? ...not using the data link?

you might also address a ground loop incident as a further precaution.

VSA replaced all the tweeters on my JRs at one point. Mine weren't buzzing however.

Easiest way to troubleshoot this is to try a different set of speakers. If the buzz goes away, it is the VR's. If it is the VR's, connect only the bass module and play bass heavy music. You may find that something on/in the cabinet is buzzing. If nothing, then connect only the MT module and play the song which causes the buzz. Get right up against the speaker and listen closely. My speaker input housing would buzz occasionally and I re-seated it and re-tightened all of the screws. The buzz was gone.

If you suspect the unwanted sound is a mechanical resonance from a speaker driver, try running a frequency sweep (though be careful with volume level as you get into the highs - you don't want to fry a tweeter.) If there is a resonant frequency you'll notice it as the sweep comes up to that frequency and then it'll go away as your sweep continues to climb.

You can probably find a sweep you can download as an audio file if you do a Google search.

If you are hearing it from ALL the tweeters, I doubt very seriously it is a driver problem. It is most likely a product of whatever recording you are listening to at the time, combined with the level you are listening at. And you may just be more sensitive to this particular frequency. I would play these same tracks on a different system and see what you come up with.

Since you say that ALL the tweeters exhibit this, I don't think it's a driver issue. Sounds more like it's a problem with the recordings. I would listen to the same material on a completely different system and see if it is still audible.