@intactaudio Dave good to see the inquisitiveness ( the quality of wanting to discover as much as you can about things), is proving to be availing.
I was off this thread, but my visit and your last post has got me 'back in the game'.
As said, I have been fortunate in having it agreed a New Tonearm Design, I am being asked to be present for a demonstration and offer a assessment of the demonstration experience, has been agreed to have one of the models set up as a Underhung Geometry.
It will be a rigidly coupled Mounting, it will be used in comparison to the 9" and 12" Overhung Geometry. The length of the Arm to be allocated for a Underhung Geometry is yet to be made known.
The Plinth/Chassis will be able to mount Two Tonearms to a 12" length.
The demonstration is to use a Two Cart's, same Brand/Model with very similar hours of usage.
The Tonearm Design also has a Geometry, that has the Styli when in the Groove at the same height as the Vertical Bearings Axis Pivot Point.
Your taking the time to create the experience and evaluate, has been a added boost to my intentions. I am keen to see what is able to be created and where the attraction of the Geometry can be discovered, in relation to the Overhung alternative.
As per usual, whether Overhung or Underhung, all assessments will end up as a subjective evaluation, that is to be made through drawing from multiple years of experiences of being demonstrated multiple differing HiFi related Designs being put to use.
There is a Computer Programme available occasionally for System Health Checks, especially for a Vinyl Set Up. The use of this on a well known system produced a end result, where the improvement in the presentation was by myself perceived as almost Tangible. The imaging become very focused and the performers were more present than what was remembered. This Software might? be available for the demonstration day as well.
It will be used at some point to give the New Tonearm Design the fairest of lore, as getting the Cart' optimised in its set up Geometry will go a long way to help learn as much as can be offered.