Thanks Myles. I've just discovered this site and have read that people are moving over from Audiogon. I would sum up the difference between the 9" SME V and the V-12 like this: It is like going from a compact two-driver, two-way speaker to a 3 or 4 driver, three-way speaker, without any loss of coherence or seamlessness. Extension both up and down increased as well as the retrieval of low level information and micro dynamics.
This latter quality could be from the longer length resulting in a flatter arc and thus lower distortion. I used a MINT LP arc-type protractor to align both the V and V-12 and the shape of the curve and the overhang (distance of the arc trace to the spindle hole) are dramatically different (see first photo below). Finally, I was able to adjust the counterweights of the V-12 arm making it very heavy. This allowed me to slide the weight very close to the pivot point of the arm (see second photo below). The added weight of the counterweight and the longer arm put more downward force on the bearing and the closer distance of the weights decreases the moment of inertia of the arm, both, at least in theory, improving performance.
This latter quality could be from the longer length resulting in a flatter arc and thus lower distortion. I used a MINT LP arc-type protractor to align both the V and V-12 and the shape of the curve and the overhang (distance of the arc trace to the spindle hole) are dramatically different (see first photo below). Finally, I was able to adjust the counterweights of the V-12 arm making it very heavy. This allowed me to slide the weight very close to the pivot point of the arm (see second photo below). The added weight of the counterweight and the longer arm put more downward force on the bearing and the closer distance of the weights decreases the moment of inertia of the arm, both, at least in theory, improving performance.