If you were in Europe, you didn’t have good sub options 5 or 10 years ago. Now you do, you have some good options in the 1k to 3k range...
Elac Varro DS1200 (dual opposed 12 inch)
Elac Varro DS1000 (dual opposed 10 inch)
Elac Varro RS700
Elac Varro RS500
KEF KC92 (dual opposed 9in)
KEF KC62 (dual opposed 6.5)
etc that are all good subs for music with extension under 20hz.
Since Rythmik is US manufacturer direct, it works out better (price/logistics) in the US. James633 is not alone on the report of JL reliability issues.