A record mat can perform several functions. Most of these functions are to improve the performance of a platter with inherent design flaws. If the platter is properly designed(which many aren't), then a mat should not be used or needed. If there is a design flaw, then a mat can possibly provide the compensation for that flaw, depending upon how severe the flaw is. For example, a mat could be used to dampen resonances or vibrations, or improve impedance coupling to the platter, or be used as a VTA spacer, or any number of things. How well( or badly) the mat works on a given table, will directly be the result of what mat is chosen for what platter application and how it addresses the platter flaw in question.
In a very well designed high-end turntable, there is rarely a use for a mat, and you don't see them very often on those kinds of tables. In the lower price range tables, where cost-cutting measures cause some compromises in design, then the platter mats may have some application.
In a very well designed high-end turntable, there is rarely a use for a mat, and you don't see them very often on those kinds of tables. In the lower price range tables, where cost-cutting measures cause some compromises in design, then the platter mats may have some application.