You can find speakers at a somewhat "reasonable"price that can sound very good to excellent in classical and jazz, but not necessarily on rock, heavy metal or organ. That's where a good subwoofer comes into play.
IMO, an excellent speaker in the 35hz to 20 kHz range, coupled with a good subwoofer probably can do better than a speaker that attempts to furnish smooth reproduction from top to bottom.. Very few full range speakers can provide the octave-plus bass that can be obtained by an active large-cone subwoofer. (On a decent recording, the sound of those 32' pipes of a cathedral organ can be felt as well as heard.)
Disclaimer: I'm a full range plus subwoofer guy
IMO, an excellent speaker in the 35hz to 20 kHz range, coupled with a good subwoofer probably can do better than a speaker that attempts to furnish smooth reproduction from top to bottom.. Very few full range speakers can provide the octave-plus bass that can be obtained by an active large-cone subwoofer. (On a decent recording, the sound of those 32' pipes of a cathedral organ can be felt as well as heard.)
Disclaimer: I'm a full range plus subwoofer guy