Things I listen for in a really good speaker.
Imaging - if you close your eyes, can you picture the location of every instrument on a stage. Are the oboe, flutes and basoon in the center of the soundstage, with the violins to the right and clarinets to the left in a seamless transition from left to right. Are the trumpets, trombones and percussion behind the strings and winds. You should be able to build a visual impression of the stage from the sound you hear.
Accuracy - Does a clarinet sound like a clarinet is in the room with you? Does a cello have an unnatural resonance that you would not hear in a live performance?
Transition - Does the speaker reproduce quick, sharp sounds then go silent, as in the case of a singe drum hit, or does the sound sort of taper off or linger for a split instant, just enough to take away the realism of the natural sound.
These are some of the things I listen for. I don't know if my terms or standards are proper. I know I haven't found a set of tower speakers that I really like because to my ear, most if not all seem to have a bloated resonance in the mid section that I find distracting but hard to accurately describe. In terms of speaker shopping, I guess I'm a subjectivist yet I defer to the objectivists nearly every time because they could (if they wanted) quantify my likes and dislikes in a speaker through measurable data. If you wanted to tackle this hobby with a vengeance, you could be able to look at speaker and cabinet measurements and know exactly what you will hear from a particular speaker before you actually hear it...with some degree of accuracy in the results.
But none of that will account for your personal likes and dislikes. Here I sit with a pair of Era D5 and a pair of Dynaudio Focus 140 at twice the price. As a rule, I leave the Era in the system and the Dyne's on standby simply because the Era sound pleases me for most situations. There is no question in my mind that the Dyne's would measure better in virtually every test and are fantastic speakers in there own right on virtually any source. So why do I listen to the Era so much? I don't know...I guess there's no accounting for taste.
