The S4 has good sub-bass quantity and it is extended well. The sub-bass reproduction has a natural rumble and the impact is on the softer side of things. The bass decay is quick and the added agility improves the engagement level well. The bass texture is rendered with moderate smoothness. The mid-bass is full-bodied but without any feeling of the slam being dense. There is moderate punchiness. Each bass note is articulated in a smooth manner without any aggression.
The midrange of the S4 is presented in a smooth manner with moderate transparency level. The lower midrange has good quantity and male vocals are expressed well with body. Emotions are conveyed well. The upper midrange is not very forward and the slight lack in emphasis creates a soothing female vocals display instead. The midrange is relaxing with reduced presence. Vocals reproduction has an effective level of details retrieval and there is an enjoyable listen.
The treble has good extension and it takes on a smooth expression. The finesse is showcased well with a controlled presentation. The crisp has moderate definition with the sparkle slightly lacking. The treble has good body to prevent any signs of it sounding thin. There is a moderately airy feeling. The treble expression is soothing without any sibilance or harshness.
The S4 has natural expansion in its soundstage. It provides a more intimate feeling. The width magnitude is moderate. The depth has a good amount of space rendered. The positioning of vocals and instruments has moderate precision.