First of all: I am a foreigner so my english may not be perfect. Equipment used: PC Sound card: EVGA NU Audio Pro Headphones: Audio Technica ATH-AD2000x Music used: 1995 Chesky Records - The Ultimate Demonstration Disc (FLAC's); lindsey stirling -- Home album (Flac's); Eivor albums Bridges and Slor; Haggard album "And thou shall trust seer", Finntroll albums Opamps: Burson V5i-D (bought myself) Burson V6 Dual CLassic's (bought myself) Burson V6 Dual Vivids (sent by Burson in exchange for a honest review).Packaging was great.No complaints...