Body font family verdana geneva sans serif font size11px td font family verdana geneva sans serif font size11px fiio k1 portable headphone amplifier and dac the thumb sized k1 from fiio is a portable headphone amplifier and dac with mastering quality sound that supports resolutions of up to 24 bit 96 khz the unit offers true plug and play operation with no batteries to charge and no drivers required for operation summary the k1s audio architecture utilises savitechss sa9023a usb