Is the DP-8 really a unipivot? I thought only the UP-4 is a true unipivot.
No. The DP6/8 uses a dual pivot, similar to the traditional knife edge bearings in the old SME arms except that instead of knife edges it uses points and cups. Far more stable than a unipivot.
one of which we can call a modified unipivot (Kuzma 4-point). As for me, I am a little suspicious of tonearms that started life as unipivot designs and later incorporated very significant crutches
The Kuzma 4Point did not start out as a unipivot - it was a "clean sheet" design, bearings in the vertical plain are similar to the Moerch - 2 points, one in a cup, 1 in a knife block. This is quite clever becuase the armtube is removable, and when you place it on the pillar assembly all you do is locate the point in the cup on one side, and then lower the other side which automatically finds the correct position. Long term I would surmise that if the cup wears, the point will self centre, and the slot on the other side allows for any change - very clever.
If you use audio parlance - gimbal bearings, unipivot bearings, knife edge bearings ( SME SAEC ) both these arms are more akin to knife edge bearings than the others.
The Kuzma 4Point11 has the best, easy, repeatable, fine turnable VTA adjustment of any arm I have used/set up. If you have a collection of both traditional thinner records and 180g vinyl then easily adjusted, and measureable VTA is critical in my view so that evenif you dont do VTA for each record, at least you can have 1 setting for each type of record - 180g/normal
