Subwoofers with room correction built in?

@redwoodaudio said: "This is an interesting option from Underwood hifi by DSpeaker: 8033 SII subwoofer equalizer. Just for the subwoofer."
That’s the unit I mentioned upthread. It is inexpensive, comes with a calibration mic, allows you to do repeated cycles with different mic placement and enables you to DSP just the subwoofers. That’s what I use with the 15 inch Rythmiks. I run it through another line out on my line stage. The main speaker system is not getting any signal from it and remains entirely unprocessed.
Very effective, both in terms of performance and cost, especially since I’m running those subs very low-- as mentioned, roll them off at 55hz on a 24 db/octave slope. The trick is dialing in the main speakers and woofers once the DSP does its thing- manually adjusting gain (including through use of a good SPL meter), phase, roll-off of the main speakers, their crossover point, etc. Still takes time and effort, and no remote, but it works well for me.

I find the processing parameters offered with many of todays consumer subwoofers built in room correction / optimization quite limited. 
On the other hand unless you've heard the affects of a suite of manually adjusted parameters I think you'll be quite satisfied with the before and after the Elac smart phone application appears to offer.
Any sub is more fun than no sub.

Welcome to the deep end, have fun with it

@m-db thanks for the encouragement!  Rarer on these forums than it could be.

Well, I'm a few days into using my new Elac 3070.  The auto-eq feature smooths things out a little, but in my room it does not appear to make all that much of a difference.  The room has rarely caused me problems with other gear and setups.  Overall, love the app-based interface of this subwoofer but most of all the excellent bass foundation it provides.  Currently crossing over the sub at about 60-70hz with my my Graham Audio LS5/5s.