I had the VPI SDS and it worked fine but after trying the PS300 from PS Audio I sold it and still use it today. I feel the 300 sounds much better. It adjusts both voltage and frequency and is better for an AC motor. If you can get one used upgrade it to miltiwave2 and shut off mutliwave as AC motors will burn out with more than 1 frequency. The other thing I found was my older Meridian DVD player sounds better with both 60/100hz.
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