Atma-sphere et al, There is one type of pivoted tonearm that exhibits the property of a low vertical inertial mass with a high horizontal inertial mass, a la most SL tonearms. That is the Dynavector DV series. Rather than try to translate what Dynavector says about this feature of their tonearm, I am quoting here the DV505 owners manual:
www.dynavector.com/etechnical/505manual.html
The verbiage hints at why a high horizontal mass has some advantages as regards low frequency resonance control. As I think I mentioned once before, there are also a few vintage conventional pivoted arms that have obvious added mass on their lateral aspects, added usually at the pivot, e.g., the SAEC, to name only one brand. My point is that there are possibly some theoretical advantages to having a low vertical and high horizontal inertial mass, combined in one tonearm. Ralph, I would be interested to know what you think about this.
www.dynavector.com/etechnical/505manual.html
The verbiage hints at why a high horizontal mass has some advantages as regards low frequency resonance control. As I think I mentioned once before, there are also a few vintage conventional pivoted arms that have obvious added mass on their lateral aspects, added usually at the pivot, e.g., the SAEC, to name only one brand. My point is that there are possibly some theoretical advantages to having a low vertical and high horizontal inertial mass, combined in one tonearm. Ralph, I would be interested to know what you think about this.