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.

Rex,
As John points out about his DSP8000's, I used to have these 8000's in my theatre and swapped them out for what I have now. When you have these speakers; there is NO need for a sub. They are full range. My system now is even more dynamic and bass accurate then when I had the 8000's in my room, because they were over powering. I have had a Revel sub in my system and as good as it was, with my current 5 channle full range set up, I do not miss a thing.

I don't suppose adding a sub in my small room would even generate clean signals that low beecause the room is too small for those frequencies to form correctly, am I right? That is why in my room; 5 full range 5200's sounds better then when I had only 3 full range (8000's and 5500hc) up front. If I have crunching bass now, I worry that a sub will just muddle things up.

What is the best way to test how low the system can go to using an spl meter?