Basically the emx 500 has a good wide soundstage , surrounding the listener. When we refer to soundstage we are looking for 3 things, horizontal, vertical and depth the emx 500 does all 3 well. The sound is not forward nor recessed.
Articulation is another aspect of a good earbud. Articulation refers to Layering in how the treble, mid and bass is articulated. there must be a clear distinction in how they are displayed. Most flat response earphones and earbuds display a sound that is uniform and without articulation.
Detail , Sparkle and sub bass : These are characteristics referring to accuracy and vibrancy of the sound. sparkle is an extended frequency reverb effect when treble sounds occur and sub bass is the low bass extension ( sometimes as rumble effect or presented as flat and smooth effect distinct from the mid bass) the emx500 does these quite well .
The only drawback of the emx 500 have is transparency. They are not very transparent in the stage This refers to individual sounds which have fluidity and airyness in a 3D soundstage. it mainly refers to sounds floating or traveling on forward (depth) layering in 3D space, which is different from the high mid and low layering (articulation). Although a soundstage can be airy, airyness here refers to the amount of background surround , transparency allows for the sounds to have a fluid or wet or floating quality for a 3D holographic sound