Arc SL is barely mentioned on any support pages, including those with comprehensive lists where it seems like it would clearly belong.
I realize the Arc SL is a slightly esoteric product, being sold only at Costco, but, hey, the SYMFONISK line of products appears on the support pages, so why not Arc SL as well?
Here are four pages where it seems like Arc SL should be listed, but isn’t (and I assume there are others as well):
Supported home theater audio formats
I think it would help owners of the Arc SL to have it properly represented on Sonos support pages.