Lewm,
As you know, Henry, a shelf will be put into oscillation, by energy put into it.
I know no such thing.
And your common flaw of argument is precisely these types statement of false 'universal facts' without the provision of any scientific evidence.
What I do know from a study of acoustics.....is that for any given material (and dependent on its thickness)......the majority of air-borne sound waves will be reflected or pass directly through.
Certain frequencies (depending on the material in question) will be absorbed as heat....and/or transmitted in all directions within that material until they are all absorbed as heat.
But I repeat....the majority of air-borne sound waves will be reflected or pass through the majority of materials.
Every material (including liquids and gases) has a resonant frequency....and these can easily be measured via accelerometers and other more complex devices.
The excitations of these resonant frequencies (and their harmonics) can be measured and heard (if within the audible sound spectrum).
You have provided no scientific proof that the resonant frequency of my particular shelf (or anyone else's) has been excited by the air-borne sound pressure produced by the speakers?
Of far more telling damnation IMO.....is the fact that you still....repeatedly and consistently.....refuse to address the effects of these 'resonant frequencies' on:-
1. The Platter
2. The Spindle
3. The Motor
4. The Pulley/s
5. The Belt
6. The Tonearm
7. The Headshell
8. The Cartridge
9. The Cartridge Screws
10. The Cantilever
11. The Stylus
12. The Record
You hyperventilate over a 'resonating plinth' or shelf....which presumably you believe will 'transmit' its obscenities into any or all of the above mentioned turntable parts and thus contaminate the reproduction chain......yet you appear to have no concerns for the 'resonating vibrations' transmitted directly into all these above mentioned parts?
Doesn't this in any way appear comedic to you?
Or is it just me?