https://elektrotanya.com/sony_sa-wct260h.pdf/download.html#dl
https://elektrotanya.com/sony_sa-wct260_ver_1.0.pdf/download.html#dl
https://www.mikrocontroller.net/attachment/451930/sony_ht-ct260h.pdf
FCCID:INTERNAL SUBWOOFER https://fccid.io/58042a9c-95e9-4e19-b940-2abcebbd9c6e
https://c.searspartsdirect.com/pd-content/is/content/Sears/1511465L
https://www.sony.com/electronics/support/res/manuals/4463/44635221M.pdf
note
Save as / rename as a PDF, it is .pdf to view - not .png: