Direct Drive vs. Idler Drive vs. Belt drive

Problems with two or three motors are: (1) They have to be perfectly in synch with one another, and (2) you now have two (or three) potential sources of noise that could be transmitted via the belt to the platter.  No free lunch.  I also think that we anal audiophiles worry perhaps too much about issues that are in reality way below background, if the product is well made and engineered.  So 2 or 3 or 4 motors (how about that?) might be fine.

Hi @lewm ,

People think that belt drive is a black magic, technically perfect solution.
You just need a heavy platter on a good bearing and you have very low, inaudible level of Wow and flutter. But it doesn’t work this way. At least, mid-price belt drive turntable have a very perceptible level of Wow and flutter, and it is much worse than rumble that good designed, affordable idler drive like Lenco has.

Regards,
Alex.

In a synchronous motor the rotor lags behind the rotating field. This angle changes with changes in load There are subtle differences between motors, even with apparently the exact same build. This results in slight differences in this lag angle for a given load between (identical) motors
In a multi motor design, this means that one motor will be the master and the other(s) will slave this. 
The master providing the bulk of the drive torque. 

Consider the implications of this characteristic when 2 or more motors are used to drive a platter    

Thucan, more wishful thinking. If you can't afford new stuff that is fine. Buying used gear that is within your budget can be a smart way to increase the performance of your system.  But trying to compare a D103 in any form to a Lyra Atlas or an Ortofon Windfeld Ti is ludicrous and delusional. However most do not have speakers capable of resolving the difference so spending the extra money would also be sort of silly.

Alex are you kidding? I would wager $1000 that you can't hear the difference between a cheap belt drive and an SP10 in regards to wow and flutter. Not only can you hear rumble but it also distorts everything else you woofers are doing. And, since when have you made that comparison in a scientific fashion. Let me answer for you. Never.