I'm an outlier apparently.
I had two JL Audio subs with their fantastic CR-1 crossover and also added DSP.
Nothing life changing. Didn't do much for me. Didn't find the added low bass to be significant and I preferred the tonality of my speakers without the subs. Sold it all. Happier with fewer ugly boxes in the room, fewer cables, less hassle etc.
(Great products...I just didn't need them to enjoy music).