Looking at the dealer order guides for 2020, 2021, and 2022, along with the brochure for 2021, it appears the 12 speaker system was only standard on the 2020 ST. That year it included all the equipment from the Limited 300A that did have the 12 speakers. 2021 and 2022 only include equipment from the XLT 202A which does not include the 12 speakers. So it looks like that change was made a year ago for the 2021 models.