Damping to exitation of parasitic modes of

So Jeff, your saying you believe in "Sympathetic Vibration" and "Compassionate Resonance"? I'm unsure about the resonance and have found no way as of yet to prove anything positive about those vibrations.
   Clue me in.
    As far as the Sorbothane goes you may have used too much in mass of the wrong durometer. I've also had problems with it not loading to spec. Besides that, It smells funny.

And yeah I've been experimenting with the constrained layer damping since before it was given that monicker I believe. It's one piece of the puzzle. No more, No less.
    I quit solving for "X" as an absolute a long time ago. Everything has it's place up to a point.

Give my sympathy to your liver, Joyboy.

If you don’t have any Shun Mook Mpingo discs in the system you’re really missing out. You have my sympathy. Even one Mpingo disc in the room, properly placed, will cause your jaw to hit the floor. Your wife will call out from the kitchen, "Honey, what did you do to the system?" Finding that precise location, as fate would have it, is what drives audiophiles to the brink of, well, the brink of something. Of course, resonance control is my middle name and I have many resonance control products, including a rather largish constrained layer damper. The specific material I use for the viscoelastic layer is, however, proprietary. If I told you I’d have to kill you. 😬