Which tonearm with a Soundsmith The Voice?

Alanpiga - A few that come immediately to mind: SME Series III, Infinity Black Widow, Grace 707, Mission 774 original. All of these are readily available for less than $500 - most of them closer to $300.

I saw a used Schroder #2 9" arm with a Pertinax armwand for sale, but unfortunately not on Audiogon.

where was this 2 for sale?

22 cu is the same as an Ortofon 2M. There are plenty to choose from that are less than 12g. Even a little more than 12g should be fine if your set-up isn't prone to feedback.

An arm with mass lower than recommended (Black Widow) isn't a good idea. If the effective mass is too low, the resonant frequency goes above the recommended range and can cause intermodulation distortion. This would be especially true in an arm w/o fluid damping.

Origin Live Silver or Zephyr should be good (12g), and also a Moerch with a yellow arm tube. Some people rave about the Audiomods arm from UK, sold direct. There are plenty of excellent used and vintage arms. You have to hunt.

Regards,

I run the vinyl engine tonearm effective mass calculator using 2 gr as mounting hardware (Soundsmith's aluminum screw set) and got the following results for the desired resonance between 8 to 12 Hz (-.82 to 9.16 gr). -.82 gr.: a negative number! there is no lower limit!!! This doesn't correspond with some of the suggestions I have seen. Some suggestions are for 11 or 12 gr. so, practical mass differs from calculated mass. What else is to be considered to determine ideal mass?