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Why do tonearm specifications list null points?

I happened to be going through the manual that came with my Clearaudio Universal 12" tonearm and noticed they list inner and outer null points, 66.04 and 120.9 respectively, along with all the other specs. 

I was under the impression that tonearm geometry can be set to anything you want to use (Lofgren, Baerwald, Stevenson, custom) by setting it up with the specified spindle to pivot, overhang, and angle settings using a tonearm protractor, e.g., Dr Feickert, etc.

So, is the tonearm manufacturer trying to say that this particular tonearm is somehow optimized or was designed to utilize those null points they list in the spec?

128x128jimmy_jet

Showing 1 response by rauliruegas

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rauliruegas
12,835 posts
 

Dear @jimmy_jet  : As a fact normally manufacturers did not write that spec because it's not really a tonearm spec and could makes ( as in your case. ) a " mix-up " for the owner.

Those null points means that one kind of alingment you can choice is the IEC standard Löfgren A and that's it.

" Soundstage returned ", well that's what you listen but not really a change by the Löfgren B because the overhang in between both alingments is lower than 0.5mm with the same offset angle.

Even the average distortions between both kind of alignment is around 0.04% lower in the LÖfgren B than in A.

 

What you listen is more a consequence of the tiny errors coming from the protractor and coming from our " hands " movements to the new set up. It's almost imposible to make a change in alingment making the same change 3-4 in a raw and achieve exactly the same grade of accuracy.

 

Regards and enjoy the MUSIC NOT DISTORTIONS,

R.

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