Eminent Technology ET-2 Tonearm Owners

Slaw-

I personally have only tried it with the spacer, but now wonder if this could be a source of unwanted resonance using the acrylic armboard?

IMO – added resonance – yes. But whether it is a good or bad resonance in your setup only you can tell. Is this any different really than adding layers to the platter ? As ones system resolution rises its a resonance game we play with vinyl. Adding layers for me complicates things; as far as allowing me to understand what material/part is contributing to the sound.

I believe it was used (shim) to keep from marring the acrylic surface with the 3 ET2 spikes. I did use it with the TNT. I don’t use it now – my 2 ET2 arms are mounted naked with their spikes.

With the machine skills you have, as seen by your standalone motor assembly I would be making up 2 or 3 different material armboards. :^)

Nandric
Regarding your 'base' philosophy. Not to get involved in infinite regress or adding up of meanings, we all are moving at about 700 miles an hour, carried by the diurnal
rotation of our 'mother earth'. For your 'basic base' there is no futher reduction possible. But 'it' moves as Galilei persisted on and got in trouble with the 'mother church'.

Hi Nikola

I personally learned a long time ago not to worry too much about things I have no control over such as the world spinning, 18 year old fraternal twins :^( , etc…. or I would have put myself 6 feet under already by now. I prefer to have fun in this hobby and in areas I have control over, solely based on what I am hearing.

And because 'plinth=base' there is no better base for whatever TT than the slate kind. It should be counted as the real estate because of the weight and value.

All materials resonate including slate. From what I recall reading (not listening) slate resonates around 121 hz (forget what thickness it was). Lower than your acrylic Kuzma which I believe was around 207-210 hz in the tests that were done; not sure again of thickness that was used. This info is avail on the internet if you google it. How accurate it is IDK.

I have however read that using a full TT system plinth in a low resonating material helps to boost the bass in a room ? This could help if your room/speaker/placement combination is lacking in the low end ?

Glad you’re having fun with your SP10 Nikola.

Ct0517
Fyi the Final Audio TT uses a 35mm thick slab of superplastic zinc ( SPZ ) for the "plinth" - weight of plinth exclusive of platter/bearing/armpod/arm is approx 40kg. The inverted bearing and armpod are bolted directly to this slab. Info is here :
http://books.google.co.nz/books?id=ohQdU5ggcOIC&pg=PA143&lpg=PA143&dq=superplastic+zinc+(SPZ)&source=bl&ots=uDqm8e0JsG&sig=oPdsNcyBUypOB6D9VWdrx_vFdgQ&hl=en#v=onepage&q=superplastic%20zinc%20(SPZ)&f=false
The base is tight and quick.
My experience is that slate does ring. A friend of mine is now working on a ultra lightweight composite powdered ceramic sandwhich plinth for the Garrard 301 to try a "non stored energy" approach having discarded slate/panzerholz etc.

In the time of Hegel the only methodological 'instruments' were the 'cocepts' and the 'S is P' sentence form. So to move farther Hegel invented that each concept has its opposite while the opposites have their own opposites, and so farther. I see that this 'method' is not only used to describe things but also put in practice: 'try the opposite if not satisfy with the actual concept results'.

Regards,

Hi Dover – thx for the info. Please tell me there is not going to be a pop test quiz on that material.

More on resonances

My Verdier plinth – which holds the platter, armpod, spindle (no physical bearing) instead two large shielded magnets - is made of Granito.

Granito is a material composed by little pieces of marble of very different origin agglomerated inside a mold with cement. Machined and polished.

The resonance of the plinth with its suspension is about 5Hz and it is well absorbed by the air cavities.

The Granito and resonance info comes from Mr.Verdier himself to me in an email.

My SP10 unit (version 4) is bolted in by four - one inch solid stainless columns to an MDF plinth which in turn sits on a pneumatic suspension, which in turn is on a wall shelf (load bearing) The MDF base is a full TT system plinth as it holds all the goods. It supposedly resonates a little lower than slate. The armpod 19 lbs relies on its weight alone but my version 5 plans are to have it bolted in as well, and I am not sure what material the next plinth will be.

The Nantais L75 is an all wood layered plinth and I have convinced myself that if I take my boat to the middle of Lake Ontario and drop it over it will sink. It feels like cement when carried.

This has been said before – The ET2.5 spindle resonates at 2-3 Hz. The skinnier ET 2.0 spindle resonates at around 5-6 hz.

Resonances can be fun ?

Nandric: I took the plunge and ordered the Clearaudio. On Take Five Audio's site, they looked to be short enough to work well. Thanks for the tip for EBay.UK, which is where I ordered.