New SDS settings

I got a new SDS unit and the voltage drops to 72 V on both 33 and 45 RPM settings upon start-up. In my old unit, voltage would drop to 72 V for 33 and 102V for 45. I called VPI and Steve, who calibrates the SDS before it's shipped, told me that it should be 96 V for 33 and 102 for 45; he also said that the motor would not have enough torque at 72 V for best sound. Are we talking the platter speed being affected more by more difficult passages at a lower voltage? His recommendation was to recalibrate the unit.

I find it interesting as I thought the idea was to get the lowest voltage that would be enough to get the platter spinning. So if the platter spins at 72 V, it would be better than 96 V. I'm also very surprised the 'table works at the 45 RPM setting at such a low voltage.

Does anyone have any insight into this matter, or perhaps experimented with different voltage settings on the SDS? What is the interaction between voltage and sound? I guess the bottom line question is: what voltage is optimal for best sound?