Okay, since y’all been waiting to read my experience with integrating subs, here it is:
1) for STEREO content I could not integrate subs without causing some problems in playback. And I tried it over the years. THAT SAID, when crossed over, the dual SVS PB2000 pro subs to either side of the main Revel f208 speakers create a much larger and smoother and more pleasant deep bass, which I really hate to give up, and because of that I sometimes change my speakers to “small” and crossover when I am in a mood for synth tracks and such, but:
2) many new music is in DOLBY ATMOS on both Apple and Amazon, and these tracks sound FANTASTIC with subs (no crossing over, just 0.1 LFE track for subs), compared to how they sound when Denon AVR is programmed to direct all bass to large mains (no subs). And FOR THAT it is still worthwhile to try to integrate your subs so that they are in phase with the main speakers and blend in as well as you can make them to, which will also benefit you in:
3) movies.
If you have struggled integrating your sub(s) with mains and found a good practical solution - let us know what exactly did you do!