@SmarshThe first 7 digits refers to the RF-7 III's colour part number, not sure if it refers to Black Ash, Natural Cherry or Walnut, Klipsch previously had it listed on the RF-7 III's product page but no longer lists the colour part number, the next 4 digits are the "Date Code", "2219" is Year 2022, Week 19 so it was built in May 2022, the other was built 10 weeks earlier, "2209" is Year 2022, Week 09 so it was built late Feb/early March 2022