Tonearm mount to the plinth vs arm board vs rotating arm board vs isolated tower

That’s the advice you get from ’amateurs’....🤪
HERE is the ’reality’ from Mark Doehmann, responsible for the designs of the Continuum Caliburn and Criterion turntables as well as his own Doehmann Helix 1 and Helix 2 turntables.....all of which are carefully designed with the tonearm mounting bases ISOLATED from the bearing and plinth 👍

Sorry Halcro, you fail to understand that both can be true.

Here is the brief from Dohmann...

The new ’table retains a somewhat simplified version of the unique "floating" armboard technology originally found in Mark Döhmann’s earlier designs, which physically isolates the board while maintaining (it is claimed) positional stability.

So Dohmann claims to provide BOTH isolation AND postitional stability.
I have not personally deconstructed the Dohmann but I understand that it uses a series of interlocking plates and composite materials to provide both isolation and maintain positional stability of the arm relative to the platter.

We are after all trying to measure a micro groove with the stylus - the stylus mounted on the armboard, the groove is mounted on the platter.
Any lack of rigidity between the platter and armboard will result in inaccurate measurment of the record groove. Its that simple.

If you want to perform an experiment - try measuring the height of your house whilst bouncing on a trampoline - you could post a video on you tube with and without the trampoline and we can then give you some feedback.

The base weighs 18 lbs (8.1 Kg)......

But a SOLID GRANITE CRADLE, whilst not as heavy as cast
metal.....was GOOD ENOUGH and relatively affordable

Really - mines 68kg, and utilises SPZ which dissipates any energy between 4 and 100hz internally at a molecular level, but is completely rigid.

Granite rings like a bell due to its crystalline structure. I would not use it in a turntable. 

My turntable however, sits on a HERZAN ACTIVE ISOLATION STAND which cancels all vibrations from 0.5Hz-100Hz.

Very good - but I prefer my music full range, if I didn’t want to hear anything below 100hz I would listen to Tin Cans.

Your herzan cant move fast enough to remove all vibration - its superficial.

Nice story....🤗
Unfortunately....a fairytale 🤥

Thank you, I like fairy stories.

For those of a technical bent, and who like fairy stories, google SPZ and grain sliding - there is plenty of interesting research from reputable institutions such as Cranfield et al. You are right with 4hz - I meant 10hz-100hz

Granite rings like a bell due to its crystalline structure.

Can you please explain its crystalline structure which enables this?
Is it similar to bronze or CAST-IRON which are in fact used for bells?
Should you perhaps inform Toho who foolishly made their TURNTABLE CRADLESfrom cast-iron....🤔

"Ring like a bell" is a euphemism for nasty resonance that induces ear cancer. If you cant hear it then you are good to go. By the way, the german word for ear cancer is ohrenkrebs.

05-12-2020 1:23pm

In the case of the first you have a subjective means to winnowing out how a separate arm pod is a failed concept;

THE ATMASPHERE PRINCIPLE

THE 'FAILED' CONCEPT

Thank you for reminding me of why I dont use rubber belt drive turntables or direct drive turntables - the swirling and lurching from note to note of a platter driven by a rubber band vs the grainy grey wash of the direct drive as it interminably tries to calculate the correction speed required on ancient "software" using 1970's electronics, not to forget that a can of Baked Beans probably has more structural integrity than the motor housing on the DD.  And to think you can even hear it with a low res MM. Thanks again for reminding me.