1. Me as an individual:
I'm relatively young at 30 years old, 95% of the music I listen is not on vinyl or tapes. If I buy a turntable or a tape machine, it would be for a minor amount of music that I can also listen digitally, so it would be a huge investment for a better experience of a very small % of music enjoyment. As such, only source will be DAC until I have boatloads of money to buy a top analog rig (no need for a mid-fi anything, life is too short and good to waste with mid tier stuff). I like colorful but linear and resolving sources, like the Rockna Wavedream DAC.
2. Coherence:
speaker has to have all drivers made of the same materials and type of construction. All cones. Must be a 2 way with a filler driver, with driver sizes preferably being 15', 8' and waveguided 1'6 cone tweeter taking into account that the speaker only has 3 drivers. Passive filter must be phase coherent and speaker must produce perfect impulse response. Passive filters must be 2 cascaded 1st order for woofer and tweeter, and none for midrange which should have "built in" 1st order roll off at both ends, baffle step compensation taken into account. Crossover parts must be all of the same materials and construction. All drivers must be loaded the same, with a sealed transmission line carved in multiple translaminated wood panels being the best possible method (custom molds being terribly expensive unless planing to start a speaker company with prospect to sell 100+ pairs of speakers, which is not the case with me). Speakers must be decoupled from the floor with a proper method, such as Boenicke swing bases. Room must have at least 2x PSI active bass traps and be of proper dimensions. Impedance must be linear due to drivers having a second voice coil that counteracts impedance peak, like 18sounds "AIC", not because of extra crossover parts. Impedance must be 16 ohms flat and efficiency over true 90db 1 watt.
3. Headroom:
10' is the mininum size for a "bass" driver, anything less is a midrange driver. A small speaker is not a good speaker, because it doesn't have headroom or plays well at low volumes. It doesn't have efficiency to play with good sounding amps either. In my opinion, small speakers are ok for desktop listening and discovering music with Youtube, not for true high end audio.
4. Lack of molesting artifacts:
smooth but not dull treble, linear midrange and bass. Proper micro and macro dynamics, due to drivers being efficient, well behaved and using good sounding materials, such as paper or hemp, coupled with good sounding magnet materials (alnico, neodymium and various field coils).
5. The ability to properly convey tonal colors:
due to all the characteristics mentioned above, the speaker can be used with good sounding, properly built pure class A amplification. 20 watts of pure class A1 being optimal, something like a custom Sakuma style GM70/GM70 with full custom finemet transformers and chokes would be ideal. Preamp must be as minimalistic as possible, a passive autoformer volume control built into the amp being preferred.
6. Conceptual coherence with regards to cabling:
cables must have custom connectors made of the same materials as the conductors, non negotiable. Equipment's connectors must be custom made out of the same materials as the cable's connectors too. Same for wall AC outlets. All of this for maximum performance.
7. Imagination is the only valid standard:
I couldn't care less about what reviewer a or b thinks or what next equipment piece is the "best", I have an imagined sound in my mind that my future speaker setup must reproduce. I've made a thread about it called "Do you have a dream sound in mind", on which people replied that they didn't, they just bought equipment, listened, bought new equipment, listened...repeat cycle. That results in chasing the next best thing instead of self education and discovering what is your ideal sound and what it takes to achieve it. Imagination is the biggest standard and it must be met or exceeded by the equipment, not backwards where the sound is only experience without imagination and direction of any future endeavors. Influence from inside you must be bigger than influence from outside you (reviewers, forum members, etc). Describing things as "real" and "natural" doesn't count either, it's like wow you got the sound you wanted in exchange of forgetting how to describe sound. Such pedestrian descriptions are not useful for anyone.
These are my observations of what I want for my personal audio system and why I think that way, please don't take them as gospel, they are just my desires and my opinion.