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Old 15th Oct 2017, 9:38 pm   #189
Craig Sawyers
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Join Date: Nov 2010
Location: Oxford, UK.
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Default Re: Audiophoolery. 'Cable Break In' - I never knew that!

Quote:
Originally Posted by stuarth View Post
I once read a review of a CD player in what I thought was a respectable magazine which made the claim that this particular player had cleaner bass because in had a die cast chassis....
Stuart
You have to be a bit careful here. The tracking requirements for a Red Book CD are quite testing. The laser focus has to be held to less than 1um and 1um in radial tracking with respect to the recorded data. The 1um focus has to be held even with 1.2mm warp. Given the rapid movement of the lens and tracking system, and the associated inertia, a rigid frame to hold the parts together is essential to prevent structural resonances.

OK - I hear you say "This is digital - it is 0's and 1's". Well it might be at one point, but I'd invite you to look at an eye diagram for the analogue output from the photodiodes in a CD mechanism. A CD mechanism is analogue through and through. Focus, tracking and data.

Craig
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