Foreword: I requested to loan and review this IEM from my hometown, Singapore. The Atlantis was what impressed me the most, with a clarity that rivaled the UERM and analytical signature that wasn't too terribly fatiguing. Frequency Response Impulse CSD THD Analysis: Definitely an audible peak going on in the upper midrange resulting in a perceived clarity boost. Gives energy to the midrange and may be too much for some. Overall balanced signature and mostly remains within the 5dB swing range. Bass is a little light-footed despite the emphasis, as evident in the CSD sonograms. High THD also detected which may explain the lack of weight and heft in the lower frequencies. (Will have to repeat right channel measurements due to unusually high numbers) All-in-all a very clean sounding IEM and a solid recommendation as a semi entry-level custom.