Mr Winer -- if you had taken the time to read the full thread you would have seen discussion of test data showing the effects of vibration on jitter in CD playback. While we can have a discussion as to whether this is audible it seems there is no discussion as to whether the effect of vibration is real
http://www.industrial-electronics.com/DAQ/optical_discs_digital_data_and_vibrational_jitter_effects.html
ps as a complete aside I was amused by the following in the WSJ today - if science is struggling to tell us how to brew a cup of coffee is it any surprise we have difficulty measuring the reproduction of music
http://www.wsj.com/articles/milk-or-sugar-in-your-low-viscosity-liquid-dynamic-scientists-seek-the-perfect-cup-of-coffee-1482164994
http://www.industrial-electronics.com/DAQ/optical_discs_digital_data_and_vibrational_jitter_effects.html
ps as a complete aside I was amused by the following in the WSJ today - if science is struggling to tell us how to brew a cup of coffee is it any surprise we have difficulty measuring the reproduction of music
http://www.wsj.com/articles/milk-or-sugar-in-your-low-viscosity-liquid-dynamic-scientists-seek-the-perfect-cup-of-coffee-1482164994