I have a pair of Focus XD and their bass is outstanding. Two 12" each side is a lot of bass. And the bass is well defined, tight and deep. Subs would be nice but they take up too much bass. And you also need to spend time to integrate the subs with the main speakers. I don't need subs with the XD. They are outstanding speakers at their current asking price. I used to own Revel Salon 2 and Thiel CS7.2. The XD blows them away in the bass department. You can try XD for a month as Legacy Audio is happy to accommodate that. That is what I did.
Legacy XD series for tube amplifier thoughts
When I look at the landscape of full-range speakers, there are many options of course, especially in the $10K to $15K range. But the vast majority of those speakers demand SS amplification, mainly due to the idea of driving woofers efficiently. Yes, there are speakers that are efficient and can be driven full range with tube gear but it often seems a compromise, especially when it comes to room size and the ability to tune a room for best bass response. Then it seems it becomes a bit of a crap shoot finding a speaker that is dynamic, resolving, bass that is not shy about reaching depths that much of our music explores and doesn't cost north of $25K. Oh, and is tube friendly.
I do have a thread opened on Harbeth 40.3 speaker but ultimately felt it was not a match for our room and some of our music. We want to play it all.
Which leads me to the Legacy XD line. Highly efficient it seems. Built-in woofers that go really low cleanly and have SOTA flexibility for in-room response. What's wrong with these speakers?