When I am playing Vladimir Horowitz on my turntable should I ask him to stop on the half hour Eastern Standard Time so I dont have to listen to the speed corrections ?
Seriously though when I was selling Elite Rock Townsend turntables which used an AC motor, when I corrected the operating voltages from 69.9 to 70 volts, even though AC motors are supposedly dependent of frequency not voltage, the sonic presentation changed from that of a Van den Hul to a Koetsu without changing the cartridge. Something was going on - motor resonance, optimum torque, minute speed changes - who knows.
Atmosphere is right there are many things we hear that are not measurable.
A sinewave doesn't tell you whether the pianist was happy or sad when they hit the note.
By the way the 0.02 is the correction of the AVERAGE fequency deviation - that is quite different from the real deviations in frequency.
Seriously though when I was selling Elite Rock Townsend turntables which used an AC motor, when I corrected the operating voltages from 69.9 to 70 volts, even though AC motors are supposedly dependent of frequency not voltage, the sonic presentation changed from that of a Van den Hul to a Koetsu without changing the cartridge. Something was going on - motor resonance, optimum torque, minute speed changes - who knows.
Atmosphere is right there are many things we hear that are not measurable.
A sinewave doesn't tell you whether the pianist was happy or sad when they hit the note.
By the way the 0.02 is the correction of the AVERAGE fequency deviation - that is quite different from the real deviations in frequency.