GW43
Prominent Member
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- Feb 27, 2005
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- Out of my mind on dope and speed
With all the talk comparing vinyl sound quality to that of CDs, I wonder if anyone has considered the "compression" that occurs with vinyl as the needle tracks towards the centre of the disc.
At the outer edge of a disc the needle covers around 94cm of groove at each revolution (Pi x Diameter: 3.142 x 30cm). At the inner grooves, let's say 7cm out from the centre, the needle is covering only 43cm of groove. So, the information within the groove gradually diminishes as the needle tracks towards the centre. At the end of the last track it's less than half than at the start of the first.
There is also the increased lateral forces on the needle as it tracks towards the tighter turning circle.
I understand CDs spin a different speeds depending where the laser is reading from to ensure the amount of information retrieved is the same.
CDs are therefore more consistent in their information delivery!
"Consistently bad" some will cry!
At the outer edge of a disc the needle covers around 94cm of groove at each revolution (Pi x Diameter: 3.142 x 30cm). At the inner grooves, let's say 7cm out from the centre, the needle is covering only 43cm of groove. So, the information within the groove gradually diminishes as the needle tracks towards the centre. At the end of the last track it's less than half than at the start of the first.
There is also the increased lateral forces on the needle as it tracks towards the tighter turning circle.
I understand CDs spin a different speeds depending where the laser is reading from to ensure the amount of information retrieved is the same.
CDs are therefore more consistent in their information delivery!
"Consistently bad" some will cry!