Body font family verdana geneva sans serif font size11px td font family verdana geneva sans serif font size11px fiio e17k alpen 2 portable headphone amplifier with usb dac the fiio e17k is a portable lightweight brushed metal headphone amplifier and digital to analogue converter dac the e17k model is fiios replacement of the very popular e17 the e17k features a control wheel for volume adjustment an upgrade in the dac specifications as well as new headphone amp components it