Because your room is garbage. OK, not literally, but it imposes its character on whatever speakers you use, no matter how good.
Dipoles are less vulnerable to this, owing to the figure 8 radiation pattern, especially in the bass.
Having an acoustician design your listening room, or at least add room treatments to your existing room, is likely the best upgrade you can make to your system, with one exception.
Digital room correction is a godsend. I use the open-source MathAudioRoomEQ because it's free and easy to set up. Having used it, I would rather quit listening to music through speakers than go w/o it. There are, of course, better methods.
Failing that, give up on speakers and use headphones.
Dipoles are less vulnerable to this, owing to the figure 8 radiation pattern, especially in the bass.
Having an acoustician design your listening room, or at least add room treatments to your existing room, is likely the best upgrade you can make to your system, with one exception.
Digital room correction is a godsend. I use the open-source MathAudioRoomEQ because it's free and easy to set up. Having used it, I would rather quit listening to music through speakers than go w/o it. There are, of course, better methods.
Failing that, give up on speakers and use headphones.