The box in which the K5 Pro arrives doesn’t exactly scream quality but it is at least colourful and is not just a simple brown box with text on it.

Another great feature of this headphone amp is that it’s super lightweight and compact. This makes it easy to transport around with you so you can listen to high quality audio wherever you want to. NOTE: Due to different TV types, some TVs default Dolby or DTS sound output, Q4 DOES NOT support Dolby and DTS sound, please select RAW/PCM sound; otherwise, you will hear a lot of noise or no sound output.) After installing, it does not behave differently to other DACs I have used in the past with Windows. The FX-Audio DAC-X6 Mini comes with a range of input and output options so that you can use it for a variety of purposes. It includes PC-USB, optical fiber, and coaxial three inputs. It can easily be connected to DCD, DVD, and TV set-top box. In terms of output, the headphone amp features RAC, 6.35mm headphone port 2, and it can also be connected to an active speaker, tube vacuum amp, and a power amplifier.No special software, app, or driver to install, a true plug-and-play digital audio adapter. with bass and treble control, can be used as a preamp or volume controller for your PC/MAC/Computer. I do not own any products with optical or coaxial output, so that part will not be part of this review. To turn the device on, the volume knob must be pressed and held for a few seconds and the the blue light above USB will light up to show the device is powered on and in USB input mode. The device always turns on in USB mode, independently of which input was selected before turning off.

Desktop: Topping MX3s, Topping DX5 Lite, Ino Audio piMx, SoundblasterX AE-5+, Dan Clark Aeon 2 closed, AKG 271 Studio (mostly for gaming)..The K5 Pro has been sent to me directly by Fosi Audio. I have no affiliation with Fosi Audio and I will do my best, as always, to be as unbiased and sincere as humanly possible, however, it is always good to note that this device has not cost me anything to try out. The Fosi Audio Q4 headphone amp is the perfect choice for those who want better control of the sound their headphones produce. This particular headphone amp allows you to easily adjust the treble and bass tones of your music to suit your personal preferences. You can also adjust the volume to make the most out of your music. With the bad out of the way, here comes the good news! This DAC seems to excel with sensitive dynamic driver headphones. The differences between this unit and more expensive units become far more incremental.