matrixrunout
Matrix runout refers to the etched data found in the runout area of a vinyl record. The runout area is the space between the end of the last audible groove and the label. Matrix runout is typically etched by the mastering and pressing facility and contains codes made up of letters and numbers, sometimes combined with symbols. Common elements include a matrix or stamper code that identifies the specific stamper used to press the record, a mastering or lacquering identifier, and occasionally the side designation (A or B) along with a date or plant code. The exact format varies widely between manufacturers and releases; there is no universal standard.
Purpose: The markings primarily serve quality control and traceability. They allow producers to track different stampers,
Reading matrix runout: Inspect the runout groove area near the label on both sides. The inscriptions are
Limitations: Because formats vary and not all releases carry matrix information, and some data may be added
See also: vinyl record, runout groove, dead wax, stamper, mastering.