Speed controllers keep your turntable spinning at exact speeds. Once you own one you shall never want to be without it.
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Generally they vary the frequency of the electricity, not the voltage, to slow, or speed up the Motor Here in US that frequency is 60hz, in Eu it is 50hz.
Some speed controllers, such as the VPI SDS also ramp down voltage to a pre-determined setting after initial motor start up at full voltage. This is said as well to reduce motor noise with the lower voltage, thus helping lower the noise floor with it.
So if I plug my Clearaudio motor into a Clearaudio syncro, the syncro is going to regulate the power to the motor to either slow down or speed up the motor? It reduces or increases the amount of electricity the motor receives? The less power to the motor, the slower it turns the platter and visa versa?