Everytime i hear a rig with a sub for 2 channel, i can HEAR the subwoofer, its not a balanced / natural tone to my ears.
And this is the problem for me, who bats for team sub. Most subwoofers are not integrated well.
When they are, they are magic, when not, they call attention to themselves.
When speakers and subs are done correctly with moderate room treatment and EQ they all disappear. The benefit of the sub seems to improve the performance of everything, not just percussion and movies, and extend the dynamic range apparently to infinity.
So, what to advise a music lover who just wants good sound? That is the question. Get a big enough speaker, and you end up with the same issues. Get naive or poor room EQ, with poor room acoustics, and you end up with a frankenspeaker effect.