The headphone amplifier sounds fantastic. It is the best sounding Amplifier that I have heard to date. The bass sounds powerful, mids are natural and accurate and they are not artificially made thick or full bodied. The treble is very present but it is not fatiguing. The detail coming out this amp is excellent. This amp is all that I wanted from my amp. It has the right balance of being transparent yet enjoyable sound. Highly recommended. I do not feeling any desire to spend money on more expensive amplifiers as I am totally happy with this amp. Easily the best product that Burson has ever produced..