Anyone with a high-end home theater sans sub?

I have a Meridian Reference 800v4 and 861 v4 with 5.0 full range DSP 5200 and there is clearly no need for a sub. It slams and crunches with bass.

I used to own Aerial 10ts and a Meridian processor.(One dynamic combo this is.)It depends on your room and what you are comparing your bass to.--?? The high end store that tries to deafen you with multiple subs?? Is that what you like??--You in the end get to decide,but Aerials and Meridian make lots of bass. I now run Sophia's for the fronts and have more bass than I need.---Your needs may be different--- BUT, trust me it's still HT w/o a sub;and especially with full range speakers that go down into the 20's.(or near that).

Adidadi - the Meridians are nice speakers. They cover nearly all frequencies you'd find in most music (excluding techno and similar genres), and they have very good mid-bass slam.

For action/adventure/epic movies, you are missing out on a substantial amount of low-frequency information.

It would be worth borrowing a sub to see what if any difference exists.

Yeah, you defintely need powered sub(s) to help that sytem respond like the soundtracks were designed, that's all. If you like what you hear, then it's all good. However, you are indeed missing the full impact of what's intended...nothing more, nothing less.
To say what you have is better or worse, is subjective. But the companies mixing your soundtracks would definitely agree you don't have it set up right.