Not getting into my vast time and experience with subwoofer integration. I knew John Marovskis, and bought many of the two or 3 models he created, for me, and my clients. Fun driving from Brooklyn to the Bronx ( lol ), but was always great to see John. Sub integration is a lot harder and trickier to implement properly, simply because of these last bottom octaves, and the room characteristics. Today, I am happy to say, I am using ONE RSL 12S, located in between my Lascalas, and it has been the best integration, and most musically coherent match with my speakers / room I have experienced living in this place since 2014. I am running my Lascalas full range, as I feel they are spectacular the way they are now. A bonus with the Lascala, on top of the fact they just do it for me, is the freedom to use any amp out there, as I am an amp junkie, and do rotations often. Actually, this rotation is now false, as of late. I have gone from using my Luminous passive pre, to my Usher preamp, since I acquired my F4 from my friend rawsonte. This combination, is truly a " reach out and touch " listening experience. On several recordings, I am at the limit with the Usher's attenuator, but reaches levels that I enjoy. BTW, I never, ever was near max with the Luminous. Getting back to the RSL. My ears are delighted with the " utmost coherent blend " this connection gives me. Reading through this thread since it's inception, it is possible to achieve good to excellent results adding a sub or two. Enjoy ! MrD.