The Zenith is more forward and in your face with it's sound. Excellent wide stage and can be a little aggressive in the top end. Very snappy and full bass sound, the black filter is default and I stuck with it on the Zenith as opposed to the pink one on the OG R1. The Atlas is one of the most engaging IEM's I have. Allow yourself to adapt to the sound as it definitely is not a "first listen" IEM. The bass is deep and the treble extends well north, there is sparkle up top.