First and foremost i love lower bass and i will always advocate for subs even if you have full range. That said, I bought too much bass, but it was a lesson learned but no faults to the REL Carbon Specials.
My system went through many iterations and through that journey I ended up no longer using them for my 2ch. No, my current speakers didnt all of a sudden fill in the low bass void, regardless of what other foolish audiophile owners will tell you. They didnt even fix the null I had at my listening position - which I always had from day 1, but I was a bit too excited to build my system. I am also a believer in DSP but just never got around to implement it.
I was alway in the mindset of buying at least two, but I eventually realized how much gain my room has - keep in mind I’m in a shared space. I have hardwood floors over concrete slab, and quite honestly the two 12s excited the room no matter how I managed to dial them in WITH THE PLACEMENT I WANTED THEM TO BE IN, they just over took the room and then always covered up the bass slap that I like around 80-100hz. There are other areas that I truly like when the subs are on, especially with vocals, yes even female vocals. But over time, my ears just picked up and fatigued.
They do well with movies though! But yes, I never truly tuned for the lower frequencies as I should within the room. All about compromises. The subs will be moved. I’ll revisit bass again with a new strategy in the future.
Eventually, over the course of building and adjusting/syngergizing just found a sound that I like and it started to become all about the music, and I find myself just listening to music (even though I know I’m missing information down low).