I was looking to improve the sound of my system based on an integrated amplifier Yamaha CA-800 plus a couple of Epicure 10 (2 ways speaker) both coming from the '70s connected via DAC (USB Sound Blaster external card) to a Lenovo T420 Win7 with a JRiver player. The sound improve really a lot, deeper bass and more defined mid range tones. Even as a headphone amplifier there's no compare with my previous DAC. The quality of service from Audiophonics has been very good (fast shipment, clear & good communication). Happy with my new DX3 Pro!