Tonearm mount on the plinth or on Pillar ?

If you think air borne vibration is not a problem you are up against the issue of the real world. No matter how dead you think a thing might be, it will always have some motion, some vibration.

This is an uneducated assumption.
Most people follow this belief but if you had studied acoustics and the science of materials, you would know that materials react to air-borne sound by a mixture of:-

• Reflection
  
• Absorption (as heat)
  
• Transmission (passing directly through)
  

It is only when sound pressure of a sufficient volume (and that's important) at a material's Resonant Frequency occurs...that the material can 'vibrate'.
You do know of course that the Resonant Frequency of most tonearm/cartridge combinations is 6-15 Hz and this is well below the frequency reproduction ability of all commercial loudspeakers and almost all subwoofers as well?
It in only in this frequency band that any vibration of the tonearm/cartridge can be observed. There is no 'alternate' vibration phenomena unless you can direct us to the relevant scientific papers?
For the heavier plinth and platter components of the turntable system, a resonant frequency in the order of 2-6 Hz may apply.
You seem to use the term 'vibrate' as if somehow it were a different genus to 'resonate'?
Not only is your understanding of air-borne sound transmission and vibration factually inaccurate, it is logically impossible.
Were it true....every increase in the volume dial would degrade the sound.
Let me repeat that....
If air-borne sound pressure is a problem in the turntable playback system, then every increase in volume would of necessity degrade the sound.
Now there are many out there who will exclaim that this is indeed the case with their systems but as I explained previously...they are hearing the effects of structure-borne feedback...AMPLIFIED.
There are tens of millions of turntable systems where turning up the volume is heard to IMPROVE the sound quality noticeably.

Halcro


"It is only when sound pressure of a sufficient volume (and that's important) at a material's Resonant Frequency occurs...that the material can 'vibrate'."

I want to be sure that I have interpreted your statement here accurately.

What you are saying is this....A material will NOT vibrate as a result of acoustical excitation unless that acoustical excitation is at the resonant frequency of the material and that this acoustical excitation is of sufficient energy.

Is this a correct summation of what you just posted?

Cheers. 

Halcro
Further expansion of my last question....
Are you saying that, with accoustical excitation, the material will ONLY vibrate if the excitation frequency is the resonant frequency of the material?

IOW. Accoustical excitation at frequencies other than the materials resonant frequency will result in NO vibration in the material, regardless of the energy level of this excitation?

cheers. 

Accoustical excitation at frequencies other than the materials resonant frequency will result in NO vibration in the material, regardless of the energy level of this excitation?

"Acoustical excitation"....? I'm unfamiliar with that term in the scientific sense. Can you please explain its meaning?
As I stated, acoustic theory as I studied it, related to materials science and air-borne sound transmission accepts that there are only three  physical observable factors.

• Reflection
• Absorption
• Transmission

Apart from the sub-atomic level at which some say everything is vibrating.....a material cannot vibrate unless its resonant frequency/frequencies are excited. And even then it may not be noticeable or destructive unless the amplitude (volume) is sufficient.
That is why the famed 'myth' of the glass of wine/water being made to shatter when a singer hits the resonant frequency has only been scientifically observed when the volume was increased to 115dB if I recall correctly?

Now here is a serious new turntable...
http://www.analogplanet.com/content/dietrich-brakemeirs-apolyt-turntable-aims-be-worlds-finest-and-m...
Dietrich knows a thing or two about turntables, arms and cartridges.
And gosh....what are those?
They look like tonearm pods and did he say in the interview that the tops of the pods are totally isolated from the plinth and structure?
Just like the famed Continuum Caliburn turntable with its arm support divorced from the platter bearing support via suspension cables and bottom magnets.
They are obviously all mad....😱