New 55,000 Euro tonearm

I forgot, that boron tonearm is the Technics EPA 100MK2. @mijostyn  and guess what? it's not a neutral design and it's a just neutral tonearm quality performance as till today no other tonearm design.

R.

The saphire Kuzma arm wand confirm what is my take about.

In the other side as you I'm not a fan of the tonearm unipivot designs....

Anyway, this unipivot looks as something to experience 

The Kuzma Safir is not a unipivot. 

Kuzma ruby choice material for its arm wand design was trying to take in count  how ruby behave with vibrations and feedback.

No - the Safir uses a sapphire arm tube.

@rauliruegas , Raul all those factors go into designing a good arm. Neutral balance is just one of them. But, there are solutions that make neutral balance less important like vacuum clamping. Neutral balance means nothing if the record is perfectly flat. Tight control over degrees of freedom and low resonance are more important as there is no way around these characteristics. This totally disqualifies unipivots and requires excellent preloaded bearings and a non-resonant arm tube and tonearm structure. The SAT arm certainly has those characteristics but there is another side to that conversation and that is mass. The SAT tonearm bearing structure is extremely heavy with excess inertia. A record can be made flat but it can not be made concentric and at least 50% of records are visibly out which means that little stylus has to start and stop that massive  bearing structure 33.33 times per minute. IMHO the SAT arm is a caricature of a tonearm. There are classier low mass ways of making a tonearm non resonant without adding so much mass. Example, Frank Schroder makes his bearing structures cylindrical. The only structure stiffer than a cylinder is a sphere. It is also very light if visibly unexciting. As for arm tubes, those conical tubes are sexy and a conical structure avoids having one loud resonance point but if the material of the arm tube does not resonate (well dampened) a conical structure is unnecessary. Those wispy arms of yore like the Infinity Black Widow need not apply. 

In Short, neutral balance is just one relatively minor aspect of tonearm design but to me it means the designer is paying close attention to detail and is likely to be concerned with all aspects of tonearm design.  

@dover , I'm no expert but I do believe Ruby is a form of sapphire.

@mijostyn 

I'm no expert but I do believe Ruby is a form of sapphire.

Sure, and diamond is a form of carbon, did you give your wife a lump of carbon for her engagement ring ?