How can external PSU's from different manufacturers make a turntable sound any different?
Surely if the standard PSU can supply enough power for the motor to drive the platter at a constant speed then that is sufficient?
Or is this the whole point and a standard PSU isn't quite up to the job of maintaining a 100% accurate and constant speed?
Or is it electrical 'noise' introduced by lower specification PSU's which is the problem and fancy PSU's are reducing/eliminating this noise?