Welcome back JCarr. Our fear was that you left us.
We need a kind of ''super authority'' in this conundrum about
the question ''why do carts sound different?'' Considering the
fact that technical issues are the same or similar the ''only''
other possibility is ''the art of the designer''. He must or should
voice or ''tune'' his own carts and this imply a.a. musicality.
So those names like Ikeda, Takeda, Lukatschek, Van den Hul,
Allaerts and J.Carr are not coincidental . However by ''explanation''
we are used to think in technical terms so there are conjectures
about stylus shape, cantilever material, moving mass, etc., etc.
So we move from the conundrum to ''parts- wholes'' distinction
with as many ''explanations'' as are the participants in the
discussion.