The SD4 has a bright-sounding sound signature and great at micro detail-retrieval. High-frequency registers sound natural and full-bodied even with the obvious boost to the highs.
The bass has that warmth that makes it really felt in the room, or at least you have that out-of-your head feeling in the low end. I can easily determine if the bass guitar has been plucked, picked, or slapped in any particular song; or if it’s a synth, fuzz, electronic, Cello, or an upright.
Owing to its aggressive character, the mids also show the same characteristic of having a more forward approach. Mid frequencies amazingly shine through really well and does not have any hint of bass leak. Its rendering is very good and very natural.