My only sub in the main system is a dual side-firing Tannoy, effectively two subs in one box. Tower speaker mfr says DO NOT high-pass; allow the mains to run full range. These are rated to 22Hz but have a peak at 35 and roll off pretty steeply below 31. So I set the sub crossover at 31Hz, rolling off at -12dB/octave above that. Basically you're only conscious of the sub with tones in Octave 0. Above that the contribution is so subtle you would notice it only by its absence.
Now, as to placement, I can move sub around using a carpet scrap on a slick wood floor. The dual side firing design seems to integrate best when placed between and a bit behind the mains. Maybe some day I will have time for more experimentation with settings and placement using good test recordings. Room configuration rules out the sub array, so need to simply fine-tune what I've got. Overall, though? Definitely worth the effort as deep bass is very important to me.
Your sub experience: Easy or hard?
For those of us with subwoofers, I'm curious whether you thought integrating it was easy or difficult. That's it.
Of course, lots of DBA people will chime in. No problem but please ask that everyone stay on topic. If you want to discuss all the pro's and cons of DBA take it to a brand new thread. Thank you.
The focus here is just to ask how many people had easy or difficult times and what you thought was the difference.