FiiO E10K is a very affordable, compact portable headphone amplifier with a built-in d/a-converter. It works as an external sound card for your computer. It’s sturdy aluminum housing, small dimensions and low weight make it perfectly portable, but of course the E10K is also very useful for desktop use at home. It’s volume potentiometer is made by ALPS, an absolute top brand, and it’s large rotary knob guarantees very accurate operation. The switchable bass-boost ensures that you get enough bass in all circumstances. For more power-hungry headphones, you can easily increase the gain at the flick of a switch. Besides that, the FiiO E10K is provided with a coaxial digital output, which effectively makes it a USB to Coaxial converter as well. This is a very nice functionality to have when you want to hook up your laptop to an (older) AV Receiver or a cherished d/a-converter without a USB input.