I like that sub idea - something happened between my last sub and the (15 years later? 12?) one that I put in place here in the back corner. I'm too old to handle the bass.
Speaker market is much more complicated than it was 25 years ago, but the internet has made it much easier to find good options and things are cheaper.
May never look at boards not suitable for dovetail and M&T the same again, though!!