Damping to exitation of parasitic modes of

"Sympathetic Vibration" just means that one vibrating object is driving another

driven or forced damped harmonic oscillator is the best search term to get the right differential equations...

I agree that you will likely need different materials for different freq. bands.

Um, ok. I do believe you are correct Sir. But that's not the use of the verb in the context in which it was meant. At least it fits my thoughts on the matter much better than -
 "Complimentary Vibration" which is as nonsensical to me as it is indeed logical. The misnomers abide me not well tonight.

Jeff, the entire Shun Mook "thing" is beyond me. I've never been one to cry "shenanigan's" to what another swears by because I've experienced too many as of yet, unresolved occurences myself. Yet if it was truly that much an epiphany, would not they at least be available with an money back guarantee?    Are we sure "Shun Mook" isn't Swahili for 'Purveyor of fine snake oils? Hmmm. shall I alert the "shenanigan's" armed response unit/ bobsled team?! And why aren't we all growing Mpingo tree's in our basements under immense high pressure sodium lighting as an erstwhile yet felonious endeavor?

There is something inside a Shun Mook Mpingo disc which makes it even more difficult to wrap one's mind around. There’s a small circular discoloration in the wood where someone obviously drilled out a hole on one side of the disc and inserted this thing, then covered it up with a circular insert. You can hardly tell it’s there. The Moingo discs are directional, both top to bottom and as you turn the disc around. That’s why one side has some Chinese character engraved in it, so that’s the side that’s facing down. I’ve knocked off more Moingo discs than the average bear and know how to mark them for direction. Call it a skill.

Hey Geoff,

A good friend is encouraging me to try Mad Scientist Black Discus. Looks like a unappetizing Reese Cup to me. Have at it if you will.

The DIY power purifier on their website looks interesting...

Dave