I have an Audio Sector NOS DAC (USB) built by Peter Daniel, and an Audio Zone
DAC 1 (USB) which is also Peter's design and essentially the same. I have run them in various tube amp/single driver speaker stereo systems with generally the same results: very three dimensional, excellent detail, fluid, and warm. The right synergy with other components is critical, and these DACs love tubes and single drivers, at least the equipment I have matched them with. I have had these DACs for around three years and am not the least bit tired of them, nor am I hankering for an upgrade.