When I got the amp I first was disappointed because I couldn't gain a proper maximum volume and also the sound wasn't as good as expected. But then I realized that I fooled myself because my DAC (Allo Piano 2.1 with Kali) has a volume control and there I kept the volume low. By setting it to max both, the achievable maximum volume as well as the sound quality improved dramatically. The hint to check this I got from Audiophonics and Monoprice which both I've contacted and both reacted within hours. Concerning the sound quality (dynamic, resolution and timbre in general) it's breathtaking for high quality recordings. After only a couple of days of listening I would not like to miss this amp. Just to notice: The headphones I'm using are Philips Fidelio X3.