I have heard the Tia Fourte on Lotoo Paw Gold Diana, Questyle QP1R, and Sony NW-WM1A. I like these IEMs on the Questyle QP1R best. Very spacious, open, and natural. I will have to spend some time with both sets. the Fourte sounds crazily good and natural. The Shure SE846 has great bass quantity, however the Tia Fourte's bass presentation is quicker, nimbler, and more organically natural. The SE846 also lacks the upper midrange/treble clarity and extension of the Fourte. I have to listen longer, as these are initial impressions. The SE846 is still a warm, darkish, quality entry to the IEM market. The midrange and treble clarity, extension, and timber on the Tia Fourte is the best I have ever heard from an IEM, but still silky smooth. The Tia Fourte has a much bigger soundstage than Shure SE846. Again these pair phenomenally well with the Questyle QP1R in high gain. I am using 96kHz/24bit, high resolution files. I briefly listened to the U18 Tzar, but liked the Fourte so much more thar Tzar promptly went back in the box. I AM IN LOVE WITH THE TIA FOURTE!