DynaVector DV505 is it worth the hassle?

Mechans, You wrote, "it is right on top of the vinyl no VTA adjustment unipivot bearing". Can you explain further just what it is you are talking about? Do you own a Dynavector tonearm to go with your DV XX20 cartridge? I ask because I too have some interest in purchasing a DV tonearm and am following this thread.

Albert, Do you think that the "dynamic balance" feature of the DV507 partially overcomes the potential disadvantage of a short arm wand on a warped LP? (I don't know whether the 505 also sports that feature.)

Dear Raul and Genesis, Your remarks and Raul's quote from the DV manual are a bit puzzling to me. How do we reconcile the two concepts of "lightness" as you both mention and tonearm "effective mass"? In their literature DV does make the dual and to me internally contradictory claims for both qualities. In fact, they quote the effective mass (with their standard 15-gram headshell) at 25 grams! (That's high, folks.) As I understand the concept of effective mass, it is a measure of the inertia of the tonearm, which along with the cartridge and hardware mass interacts with the compliance of the cartridge to determine the LF resonant frequency. I don't see how a tonearm can be described as "light" when it has a high effective mass. Mind you, the high effective mass is what you want with a low compliance LOMC, and this is what makes me interested in the DV tonearm, in fact. It certainly is a beautifully made and well thought out product.

I get it. The vertically pivoting portion of the tonearm can develop a relatively high effective mass AND be "light" in weight at the same time, due to its short length. I am especially intrigued by Raul's mention that it can be used with no drilling, by fastening it to the mounting board with double-sided tape.