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, lacquers, and mastering sessions, and they help collectors authenticate editions and track reissues or variants.

Reading matrix runout: Inspect the runout groove area near the label on both sides. The inscriptions are etched or stamped into the vinyl; they may be helpful but are not a guaranteed indicator of sound quality. Absence of runout data does not imply a faulty pressing.

Limitations: Because formats vary and not all releases carry matrix information, and some data may be added during later pressings, matrix runout is not a definitive indicator of pressing origin or date. It should be used in combination with other catalog data when dating or authenticating a release.

See also: vinyl record, runout groove, dead wax, stamper, mastering.