I know, I only had tested both a few days ago on a V20 for about 15 minutes, it's all I had, they offered a A1 or AZ, but it didn't have my music, the xelento sounded much more spacious, vocal very sharp and overal well balanced with some good bass when compared to my EX800ST, the AKT8IE was less spacious, had a little bass, but was slightly muffed up, but when used on a AK 240 DAP, the AKT8IE sounded much better than it did with a V20, it's not a fair opinion, but just what I think after listening to both. I guess it the AKT8IE was tuned to offer better sound for AK DAP, the store also say this.