This is a good product. Works as advertised and very easy to use. However, I am a bit disappointed with the sound quality. I've spent a lot of time listening to various devices with the HD580. (I used to be able to hear 19-20kHz, but now I think I'm around 18-19kHz). iphone6 -> HD580 ---------------------- --- sounds flat and weak as expected. MacBook Pro Retina 15" Late 2013 -> HD580 ----------- --------------------- -- ---- - Surprisingly, it sounds pretty good. Clarity at high…

Probably the only amp you need if you don't want to spend more than $300. I recently bought a pair of HD650s and have tried several amps but none of them can properly power the HD650. I have a FiiO K1 and I really like this little USB DAC/Amp so I decided to give it a try. FiiO's official website stated that the E10K is an updated version of their older E10 model that includes a newer DAC and amplifier chip. Received this amp/DAC same day and here is a quick review. - Build Quality: Very nicely