kota, I do hope there was a 'no' well-placed in that first sentence to nonoise.... ;) Otherwise, it reads more like we've been wasting our time chasing a chimera instead of sirens....😏 And totally clueless as to the proper means....
I've pursued flat, gotten close to something that resembles that in some way. "Bright' yes, but my personal perception of the world about us it that mostly. The pursuit of 'proper' bass is imho up to ones' preference of the experience and the 'feel' of it within that being reproduced.
I know that there are the various 'curves' one can follow, but that tweaking speakers of various sorts to properly track them within rooms of dubious qualities can make you crazy. Auto-eq takes the bulk of that pursuit out of your hands, but generally one will make adjustments to taste anyway....
I have or get what I want for the most part, having pursued 'flat' since the '80s'. You can split hairs only so much for so long that eventually all you've got to show for it is dust.... ;)
Anyway...cheers.