The State of the Art before PHANTOM: Very large loudspeakers
Big sound needs big loudspeakers. This has been true for a hundred years, since the invention of electrodynamic loudspeakers.
The most commonly used speaker acoustic loading principles are bass-reflex (also called vented) designs, and sealed box designs.
Vented designs suffer from energy cancellation at the lowest frequencies, below their resonance frequency - it is called the acoustic short-circuit. Except for very large speakers, the scale often lacks scale and impact since the frequencies between 16Hz and 50Hz are not reproduced.
Sealed box design are more desirable when it comes to being able to reproduce very deep bass without losing energy because of the acoustic short-circuit. But again, very large speakers are needed in order to reproduce every music with its entire physical impact.
Typically, the high-end loudspeakers that can reproduce most of the audible spectrum inside a home have a very large internal acoustic volume of 100L to 200L! This is as big as a bath tub. Most people do not want to, or simply are not able to, fit this into their home.