1. Directionality – Where is that sound coming from? Where exactly is that hi-hat sitting in the mix? Is the band in front of me or all around me?
2. Delay/Roomspace – Am I in a large room, small room, outside? Was this music recorded in a large room or small room? Was the recording room rounded, square, long?
3. Quality/timbre of instruments – Is that an electric guitar? Do I like the tone of it? Do I like that keyboard patch? How about the singer’s voice?
4. Stereo soundstage – Do I hear 2 guitars doubling each other, or 1 guitar with a wide delay? Is the singer front and center, or is he singing 2 parts, 1 left, 1 right? How wide are the drums set in the mix?
5. Timing of musicians and recording – Do the various delays work together musically, or are they clashing and changing the feel of the song? Are the drummer and bass player locked in? Is the 2nd percussion player ahead, behind, or on the beat?
6. Quality of recording – Is this the best version of this song? Is the distortion in the track intentionally added by the artist or is it in the format?
7. Clarity and breadth of EQ – Are most of the pleasing frequencies present, and are the harsh, brittle frequencies diminished? Do the various instruments and voices blend and work with each other as layers, or do they cover each other?
8. Noise floor – Is there a hum or buzz in this recording? Is it from a bad recording, or a loud instrument, or something wrong in my system?
9. Phase – If things were recorded in phase you don’t notice it. If things are out of phase with each other, various comb filtering and aliasing artifacts appear in your music.
10. Digital loss/compression – Has this file been reduced from the original? Did they remove things they hope I can’t hear to make the file smaller? Are there compression artifacts in the mix.
There’s 10 things to listen to without even thinking about frequency range. 10 things most internet audio experts never take into account.
Becoming a better listener makes you a smarter consumer. It will drive you to enjoy your current collection again and find new music that moves you.
It will also hopefully drive you to push for higher quality. If you must stream, go 16/44 lossless. If you collect, get as much hi-res as possible and play it for as many people as you can.