On a fairly small desk in a small room they do not need a sub, although one is definitely needed for very low frequencies or thundering bass for a home theater system, and would be a good addition in any case. I have these on my desk, and I think that’s a perfect application for them. Being 4″ drivers they’re not really suited for a large room …
https://www.amazon.com/Klipsch-R-41M-Powerful-Detailed-Bookshelf/dp/B07FKH3VPV

