Soundstage depth and width

Not only active components but cables too.

depth and width are not part of the definition of music. timbre deifnes the sound of an instrument and distinguishes it from other instruments. the goal of creating accurate timbre is more important than a concern with an artifact of music.

absolute accuracy of timbre is unrealistic. however, it is certainly worthwhile to try to attain a reduction in errors in timbral representation.

depends on music you listen to....I would rather have the full dynamic spectrum, then depth or width, but of course it all comes together, so here you go! Get speakers and amplifiers, which can do 110-120 dB in your room and you will have it all.

Live acoustic music is performed in three dimensional space as far as I know so it certainly is part of the music. Studio recordings vary in their spacial arrangements. And electronic music can have depth or not whether is live or studio.
Also, silence is just as important part of music as sounds. It too can be either flat or not.

While I don't disagree with anyone in regard to "timbre", especially since it's taken me years to get the right timbre; I consider it just another aspect in the complete package. DB in regard to loud is not something I take into consideration, while -DB in regard to the absence of noise is important. For me, the 3D sound-stage is an audiophile's finest achievement; once this has been established, the rest is easy.