I just thought I'd mention that some other Subaru forums recommended the W200 Visaton sub as a direct dropin for the sure to be blown McIntosh sub.

Amazon affil link if anyone is interested: https://amzn.to/3DXkNz4

Actually I need to spend the time to replace all 4 speakers and subs as they are all blown, as is traditional with most Subaru's (I believe due to moisture owing to the frameless windows).