@yogiboy , Thanx. I thought that line came from Dirty Harry
rsf507, motors do not have "pace" as long as they are spinning at the right speed. Variations in motor speed cause changes in pitch long before you would notice a change in "pace." We call this wow and flutter.
AC motors are more desirable in turntables as they are self-correcting. As long as the AC they are getting is accurate they will "fight" to maintain the desired speed.
The motor in the older tables is an AC motor. The Eclipse motor is a three phase AC motor driven by a computer controlled phase converter. It is just as accurate as any DD turntable and it's method of correction is quite different. It corrects the speed slowly as this is much less audible than the usual immediate correction. It also shows you the exact platter (not motor) speed down to one thousandth of an RPM. Along with a more massive platter, the high torque of the motor and vacuum clamping, the pitch stability of the Sota is state of the art. Due to the magnetic thrust bearing and isolating suspension rumble is also at the state of the art. Some people will argue that certain DD tables are quieter. This is false as you are not just interested in the rumble generated by the turntable itself but also the rumble generated by the environment. Only a suspension tuned to a very low frequency can protect you from environmental rumble. If you want to see what environmental rumble looks like just put your stylus down on a stationary record, turn the volume all the way up and keep an eye on your woofers. Have your wife turn the dryer on. Try tripping the furnace. Walk around. Jump up and down in front of the table. All that dancing you see your woofers doing is environmental rumble. It is doppler distorting everything else the woofer is doing. Make sure your rumble filter is off! You can jump around all day long in front of a Sota and the woofers will remain dead still.
@sbank , I need to point out a slight correction on your comment. Not all 9" and 10" arms will fit on a Sota without modifying the plinth cover. As the Sota's arm board is recessed, some arms like the Tri Planar will not fit without cutting away part of the plinth at at the back and right hand side of the tonearm board well. Arms with VTA towers will generally not fit. It is also critical to not that you can not just throw any compatible arm on any Sota tonearm board. In order for the suspension to function correctly at the tuned frequency it has to see a specific mass at that corner of the turntable. The tonearm board mass is varied to accommodate the mass of the tonearm. Some of the older models fine tuned this with lead shot in a well under the tonearm board. The "sweet spot" is however, pretty wide as we are talking about 1-3 Hz.