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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: Do Acrylic Platters, as a meterial, have any type of sonic signature? posted by jaybar on April 20, 2007 at 07:09:07:
Acrylic platters have a simple problem. The acoustic impedance of the acrylic is very close to that of vinyl so they couple to the vinyl very well. In physical terms this is because acoustic energy passes across the interface with less than 3% loss.Where's the problem? The acoustic impedance of the bearing / support for the platter, being metal, is far far higher so about 80% of the energy is reflected at this interface. Similarly almost 100% is reflected at the acrylic / air interface. The reflected energy passes back through the acrylic and again crosses the vinyl interface with 97% efficiency. This energy bouncing back and forth is bad news.
The thicker the platter the longer the path so the greater time lag before the reflections show up, a possible explanation of the effect noted by some listeners.
Mark Kelly
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- A problem with acrylic - Mark Kelly 19:10:06 04/20/07 (0)
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