Speed Box for turntable

Have also read about (but have not actually verified myself) that upgrading the AC cord connecting to the SDS results in sonic benefits. It would seem then that upgrading the AC cord wired into the motor would also yield improvement, although that one is hardwired & so isn't nearly as easy to change as an IEC cord would be.

Bernardwong, I have had great results running my HW-19 with the SDS. Given the age of my table I took the approach of upgrading the platter, arm, and cartridge, and when I wanted that final "push over the edge" (as Nigel Tufnel would say) I purchased the SDS. I can't say it made my table sound like a brand new, SOTA, $10k+ system, but it did make the noticeable improvements noted by Rushton above.

I would not worry too much about putting an aftermarket power cord from the wall to the SDS. Its function is to condition/clean/filter/stablize...whatever you want to call it...the power it outputs to the motor.

Dlwask, your suggestion not to worry too much about an aftermarket power cord from the wall to the motor controller makes sense and is very sane advice. But in the spirit of full disclosure, I will offer that the choice of power cord *can* make a sonic difference in some systems. In my system with the higher level Walker Audio motor controller and the Walker Proscenium turntable, this is the case. It's nuts, but we can hear the difference. In this crazy hobby of ours, this is just another example of the truism: "everything makes a difference." Cheers.
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Rushton, point taken and noted. My technical side always looks to find the answer or reasoning behind things, only to be proven wrong with a listening test. I can't tell you how many times I am just left scratching my head in disbelief when something really should not improve sonic quality, but it somehow does. I've learned this too many times before and sometimes I still wrestle in keeping an open mind. Walker 'table, you lucky dog!