Shunmook ebony weight owners

Actually, Wolf, having a guitar or two well placed in one's listening room, not to mention also something as massive as a piano, could do a lot to "tune" the room.  Surely, your system would sound "different" if you pulled out the piano.  This makes perfect sense to me.

I once inadvertently left a large empty cardboard box in my listening room.  It absolutely killed the sound in various ways.

Where we do agree is that the Shun Mook discs are much too tiny to do anything substantive, and the notion that such a thing could "regulate the resonance" of other much more massive objects is unbelievable/absurd/fallacious.

Geoff, I agree with your underlying sentiment that it is unwise to disparage a tweak or a piece of audio equipment just because it is very expensive.  I try not to do that.  On the other hand, I do try to apply what knowledge I have of the relevant physics (college level, in my case) and electronics to understand how a product "works". Then I can judge better whether it is worth the cost.  In this case, I don't see the connection.  Absent magic, it seems impossible that a small wooden disc can "regulate" the resonance of other much larger and heavier objects of heterogeneous composition that happen to be in the same room with it. Since this claim is rather extreme, it behooves the maker to provide some rational explanation for the mechanism by which the claimed end is achieved.

They say it's "simple physics".  Simple physics tells me that a small wooden disc is too small to do much of what they claim their discs do in the context of an entire room full of larger objects and audio equipment.  It's a matter of mass.  We need some magic here.  And it's the "proprietary process that gives the disc a unique property to regulate the resonance of any sonic component and its transmission."

Puh-leeze.  Whenever I read about a proprietary or patented process that must be kept secret, I worry.  Or in this case, I doubt. Because I cannot even imagine how a small piece of inert wood could regulate resonance of other objects.

I got this from a website: "Types of Wood Used for Making Violins. The woods most commonly used in violin making are Maple, Spruce, Ebony, Boxwood, Willow and Rosewood. Usually the back, ribs, neck and scroll are made of Maple while Spruce is used for the top, blocks, and linings."
Mostly, violins are not made from ebony.

What do they do, is what I meant. I have never understood how a little piece of wood, or even many little pieces of wood, could be expected to "do" much to tame room acoustics or dampen chassis resonance, one of those two of which I presume is the intended purpose of an mpingo disc. But hey, their enduring popularity is testimony to my cynicism.

Define "work", as in "they work great".  Someone.