Quote Originally Posted by frenchmon
Sounds like it would have the same effect as a speed box.
Although I haven't spent any time with a Speed Box, I like the concept of the machined subplatter better. The reason for that is that the molded phenolic subplatter is supposedly often out-of-round and of inaccurate diameter. The machined subplatter would presumably solve that. What the Speed Box can do is apparently continuously check and correct the motor speed. However, that would correct only the pulley speed, not anything that happens after that. If the subplatter is truly inaccurate, wow would remain.

I printed out a strobe disc at the Vinyl Engine site and tried it out on the Rega. Not only does the record turn the right number of times over an extended period of time, the bars on the strobe disc never waver. My gut tells me the machined subplatter is the best upgrade you can put on one of these turntables, other than a tonearm.