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


Hello,

I am rebuilding a Garrard 301 and looking for a plinth. I am planning to buy 3-4 tonearms to try. I would like to know which is the best way moving forward.

Is there a difference between mounting a tonearm directly on a solid plinth vs arm board (same vs different materials) vs rotating arm board vs isolated tower. 

Thanks
Nanda
kanchi647
The arguments just go round and round like a record.
Most of us manage to get good sound and most of us have no idea why.
Most of us think we have things figured out as to why our systems sound good to the point we will pick up our figurative sword and vehemently argue our point on boards like this and yet what we won’t admit is that we are always looking for the change that will make everything better.
I don’t claim to be an exception. I fit all of the above.
That said, I think that a cast iron or similar inert plinth weighing 200 lbs or more will NOT make a motor unit-bearing-platter-tonearm interface sound better. If someone gets good sound with such an inert massive plinth it is by fluke, not design. I am thinking of Oswald Mills cast iron plinth for the SP10 as I write this. It might very well sound great with that particular direct drive deck but I doubt the same would hold true for most other designs, particularly idlers.
I like to give this example-John Atkinson can measure loudspeaker enclosure resonance and predict the impact of same on the speaker’s sound quality til the cows come home and Mike Fremer can tap on the plinth while a record is playing and tell us what he thinks this means until the swallows return to San Capistrano but neither test means squat. And further, a totally inert loudspeaker enclosure built like a sarcophagus of poured concrete will likely sound.....dead. Aluminum rings and yet people listen to Magicos and swear to themselves that with all that expensive space age technology and expense and machining, well they gotta sound good. I don’t think they do but if you do, I would suggest it is despite the space age aluminum enclosure, not because of it.
Vibrations have to be tuned and managed, not eliminated. Just as a microphone transducer vibrates, just as a loudspeaker driver vibrates, just as soundwaves emanate from vibrations, so too does a stylus/cantilever. No one argues that those vital vibrations need to be deadened, but then many try to deaden everything else.
Fremer gave Rega’s latest top turntable a rave review. He quoted them as stating their design principle was to keep in mind that a turntable, at the end of the day, is a vibration measuring device. And then out of habit he rapped his hairy knuckles against the plinth and noted it was ’lively" Arghhh. When will we ever learn? Harbeth, Volti, DeVore, Audio Note, and many others have this figured out when it comes to loudspeakers. I am not a Rega guy but Rega has if figured out. But on and on it will go, round and round.
I must be doing something right, if both Geoff and Clearthink are angry at me. Clearthink even used his signature triplicate warning system.  (I mustn't "limit, restrict, or discourage...")   Did you think that Geoff is some shrinking violet who needs to be defended lest he walk away in tears?  Here's the thing, Geoff:  Have you considered that we are riding on an enormous ball that is circling the sun at 67,000 mph, while also rotating about its own axis at about 1,000 mph, at the equator?  My point is that the earth is our platform and everything is subject to those seismic vibrations with which you are so obsessed.  Relatively speaking we are all in a sort of spaceship that is subject to the seismic forces.  Therefore, relatively speaking there is no net motion due to seismic forces of a turntable with respect to a tonearm or cartridge or vice-versa.I'm surprised at you for getting so hot so quickly, but perhaps I struck a nerve.
@fsonicsmith 
Nothing is wrong with Aluminum; to the contrary, it is a superb material for almost anything mechanical (there is a reason supercars are built from it). It rings because it is very stiff, and that is usually a good thing, but because it is very stiff (and light), it is very easily damped. So if you dampen Aluminum, you get the best of both worlds; stiffness yet well damped composite. Steel or cast iron is a different matter. It is stiff, but weighty and therefore hard to damped, usually not a good material for anything audio (unless you are building a bell).  
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