jerry95 ... I was thinking
along the lines of ramping the speed up or down in tiny increments to
see how it might affect individual recordings which may too "bright" or
too "dull". I listen to classical music exclusively and many digital
recordings sound "digital", just like CD's.
Has anyone experimented along these lines, to make these recordings sound "better"? I don't think adjusting turntable playback speed is a remedy to treat bright or dull sound.
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lewm... The SDS, the Walker Audio Precision Motor
Controller, and many other similar devices allow you to set the speed
precisely, but they cannot correct for variations in line voltage or
current or stylus drag or bearing friction ... This is not really accurate. The devices you describe work with AC synchronous motors; line voltage and current have no affect on speed, which is governed by the AC line frequency. (That's the "synchronous" in "synchronous motor.") AC line frequency is very tightly controlled by electric utilities, because deviations in frequency can unbalance power distribution systems. It's unlike voltage, which can vary widely without causing disruption in power delivery.
As for bearing friction and stylus drag - these are really only factors with lightweight turntables and platters. Once the platter has sufficient mass, these variables have little to no influence on platter speed.
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