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Posted to rec.audio.high-end
Dennis Moore
 
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Default The truth about accuracy of CD v. LP

Yes, but to reiterate the point, Stewart is trying to ignore.
Good execution is very important.

Simple one piece plastic bearings that won't last are inferior
to two bearings and a belt if well made. Not much way to
argue that the design that lasts years is worse than one giving up
the ghost in 18 months.

A matter of basic engineering, simple overly flimsy parts don't
last as long as adequately engineered parts much less over
engineered parts. Hence a well done belt drive isn't inept
rather simply well done.

Dennis

"Stewart Pinkerton" wrote in message :

It's a matter of basic engineering. LPs spin at constant angular
velocity, therefore you want a table with an absolutely constant
rotational speed, where high inertia is an advantage. Being a fully
mechanical medium, you also need extremely low bearing noise and no
transmission of motor vibrations.

CDs have a constant linear velocity, hence the rotational speed is
constantly varying, and low inertia is an advantage. Combine that with
the use of a FIFO buffer and a servo circuit, and the fact that
'cogging' and bearing noise are irrelevant for a CD transport, and it
becomes obvious that the addition of a second bearing assembly and
intermediate belt offers no advantage, just more to go wrong and
higher mechanical stresses.
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Stewart Pinkerton | Music is Art - Audio is Engineering