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Acrylic platter tribulations

Posted by KT88 (D) on December 17, 2005 at 12:26:08

In Reply to: Re: Glass platter tribulations posted by HenryH on December 17, 2005 at 09:52:23:

Not at all what I hear. Acrylic can be a decent platform but most tables that use it to any extent sound dull to me. I have heard some exceptions from Avid (not all acrylic, but a constrained layer) and Basis.
Glass by itself can ring, but it is easily buffered by the use of various mats. Aluminum and steel are by far the hardest materials to keep from ringing. Many companies use lead or rubber inserts and add-ons to combat this. Glass is much more ideal in that it has the mass desired and is obviously very flat and is inexpensive to machine as you only need to do the edges. The stiffness of glass is simply top class and it transmits sound very quickly. That can either be used to the designers advantage or of course it could work against it. It is never as difficult to tame as metal as it transmits energy so quickly that it will not store it but for the shortest instants. Much of the ringing is eliminated also by simply using a thicker billet. Acrylic is always dead no matter it's thickness as it is simply not hard enough to transmit the energy effectively and so many listeners hear this blurring or softening effect. Some like it and some don't. It can be a good isolation material and help create a nice, black background, so it's absorbtive properties work both ways. It is best used on heavier tables.
-Bill

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