Yes, I do. All of my speakers are set to small. Only God knows how many hundreds of hours I've spent tweaking.
If you have a DSP-based Axiom sub, set it to 40Hz and then set your pre-pro to 40Hz as well and see how you like it. One of the most memorable differences was the apartment shooting scene in LFODH. At 80Hz, the rat-tat-tats were thick, slow and rattled the whole house. At 40Hz, they were sharp, fast and we all felt them in the left butt cheek right through the leather couch.
Interesting. Most people would suggest not having cascading filters like you have ie. both in the processor and at the sub. The recommendation is to use one or the other. The argument is that it causes too steep a slope at the crossover point to blend well and introduces intermodulation distortion, but at 40hz it likely doesn't matter and any artifacts would be inaudible. If its better in your room that way, that is all that matters.
