Like some Kef, Klipsch or Jbl tower speakers.
Ok frequency range of bass mid and so on isn't that exact. The frequency range from about the Schroeder Frequency to about 800Hz is the range I am referring to.
For sound power di 1.5dB isn't that small. E.g. a big speaker like the JBL M2 achieves about 2.5 - 3dB difference in sound power di in that range. And that is the difference of a 5" bookshelf and a big monitor with a 15" driver...
Yes of cause it is very subjective but a small nearfield monitor with a subwoofer can't compete in the mid to far field with any good speaker which is made for the higher listening distance (+ subwoofer if needed).
The main problem with speakers with such a big difference in the di in the lower and higher frequencies is that they get much less better with better room acoustics compared to a more constant di speaker. IMHO you won't get envelopment and exactness at the same time no matter how much you improve the room acoustics.
It is also not possible to get rid of the floor bounce hole in the frequency range of about 200 to 300Hz and that is one other important problem with small bookshelf speakers. The prediction of the in room response which is used to calculate the predicted preference score is a simple estimation and doesn't take such issues into account. Even an inexpensive tower speaker with multiple woofers can solve most of these issues and you can definitely hear this difference between such a speaker and a small bookshelf speaker.
