In theory, a unipivot arm has less
friction, leading to better sound, a more "natural" and airier presentation,
lower surface noise and less high frequency resonance. Bass bloat
common in many non-unipivots for certain acoustic bass heavy recordings is
eliminated. Caveats are that they are more difficult to set up, but only for
the first time, and the sonic gains are worth all the effort.
"A poor arm bearing (with bearing play) causes a
very unpleasant extra resonance in your arm and therefore in the sound
reproduction. The effect is virtually non-existent with unipivot arms." -
Van Den Hul
Of course, there are good non-unipivot arms,
our favorites are the SME IV and Vs. And just because it is a unipivot
doesn't mean it's superior, there are some that fail to excite.
For more information, for academic purposes
only, as it is the implementation that usually determines quality,
Read More on arm designs. After reading this
article, note that the Scheu unipivot tonearm is a clever combination of the
low-slung design (Hadcock,
Kuzma, VPI, Moerch, ARO) and the lateral weight similar to that implemented
in the Graham arm. |