If you want to cross with a sub... the options are wide open. The LX certainly does work well with a sub, but so do many other options that might save hundreds of dollars that can go to the sub or other gear.
I got things really dialed in, though it required a spot that makes all non-triangle spot listening have boomy bass, and use of a lightweight camp chair and not a regular chair. I need to revise my opinion about using these with a sub 100% of the time.
I did test tracks, I listened for a week, no problems. Sounded good. Bass great of course. A week later things above the bass started to become.... more defined. More stick/mallet strike point definition, for example. So I pulled them out 10' and went no sub and listened. I also broke out a not good pair of 5.5" speakers, just to see if what I remembered about them still held.
For my room, even with a sub, I think a 6" driver is minimum. True I could have cut costs there with a smaller driver, and on my amp, saved maybe 1/3 of my budget given the market at the time. And been very happy 90% of the time. The LX with sub? 98%, because I do not flinch at the 92-96dB level in room distortion.
The other 2% of listening involves 100dB levels, so no on the LX for that.
So, for the part of the year when the house can be open, they will be crossed with the sub. When the house is sealed for winter (amplifies my bouncy floor), no sub,10 ft into the room.
I guess I get the best of both worlds!