Dover,
I don't doubt your results. They are what they are. It's the explanation that doesn't add up. The Goldmund platter is designed to match the mechanical impedance of the record with the surface adjacent to it. A steel or copper surface directly underneath the record is a different approach.
I don't blame science or lack of, for the vagaries of platters/mats. A mat is designed to work with an existing platter. As your results indicate (VTT1 & Verdier) there are too many variables to call this science.
I assume the Counterparts mat is the one Sota called Supermat (80's). It's different from Goldmund mat. The plastic formula is softer and I believe the Goldmund mat has no layer of lead.
As the names indicate acrylic and methacrylate are closely related. Delrin is DuPont's trade name for acetal homopolymer and like copolymers, can be formulated for differing hardness. Most platters/mats are probably made from copolymers and their exact formulation was/is a trade secret. The Goldmund mat seemed slightly harder than their platters, but this perception could possibly be influenced by thickness.
What then is the goal with an aluminum platter, to dampen the platter or match the record impedance? Perhaps both?
Regards,
I don't doubt your results. They are what they are. It's the explanation that doesn't add up. The Goldmund platter is designed to match the mechanical impedance of the record with the surface adjacent to it. A steel or copper surface directly underneath the record is a different approach.
I don't blame science or lack of, for the vagaries of platters/mats. A mat is designed to work with an existing platter. As your results indicate (VTT1 & Verdier) there are too many variables to call this science.
I assume the Counterparts mat is the one Sota called Supermat (80's). It's different from Goldmund mat. The plastic formula is softer and I believe the Goldmund mat has no layer of lead.
As the names indicate acrylic and methacrylate are closely related. Delrin is DuPont's trade name for acetal homopolymer and like copolymers, can be formulated for differing hardness. Most platters/mats are probably made from copolymers and their exact formulation was/is a trade secret. The Goldmund mat seemed slightly harder than their platters, but this perception could possibly be influenced by thickness.
What then is the goal with an aluminum platter, to dampen the platter or match the record impedance? Perhaps both?
Regards,