Fosi Audio K5 Pro DAC Amp Headphone Amplifier, Mini Hifi Stereo Digital-to-Analog Converter, USB Type-C/Coaxial/Optical to 3.5MM AUX/RCA Jack, for Gaming PS5/ PC/Active Speakers Up to 24 bit/192 kHz

This little amp is a quality product, it arrives well packaged in a smart box with simple instructions and a selection of leads. The leads themselves felt a little bit on the cheap side but perfectly good for the task, I suspect most audiophiles would buy their own leads anyway.The amp itself feels very solid, with an all metal case (no cheap plastic here) that has a nice satin finish, it isn't going to win any style awards with its functional looks, but still manages to convey a pleasing aesthetic that isn't going to look out of place in any setup.The amp was very easy to install and setup, literally plug and play on my PC with no fussy drivers to worry about. It all worked straight out of the box, and it worked very well indeed! The sound is great, with no noise and very clear highs and lows. My onboard sound is pretty decent on my MSI X470 Pro, but I would compare it to the difference between listening to an MP3 and then a FLAC of the same song. Like night and day!Overall this feels like a quality product that punches above its weight in all regards, I was so impressed I immediately bought another one for a family member who appreciates good audio. I don't think you can go wrong at this price point.

OK Hands up...although I'm a serious music-lover (hence "MusicMan"...) I am also a serious Gadget Geek and when I saw this little beauty on Amazon I just had to have one - especially as I already have the Fosi Audio DAC-Q4 and being delighted with it....Out of the box I am immediately impressed with the quality of the K5 PRO, it feels and looks gorgeous.....silvery brushed aluminium....also included are three cables, a USB data transfer/power cable, a splitter cable to separate the mic. and headphone inputs and an optical (Toslink) cable.I get the unit connected firstly to my computer and power up the K5 PRO, a 3-second press on the right-hand MODE/VOL knob and there is a reassuring "click" as a relay closes internally and the left hand statue LED illuminates to (by default) USB input. (Each subsequent press moves the input to the next input selection). Worth mentioning here that this K5 PRO only requires one cable connection to my PC for power and data transfer whereas my older Q4 need 2 cables, one for power and a second for data transfer.....a bit cumbersome and the K5 PRO is much better in this respect....I must confess to not being particularly a gamer, I found the K5 very satisfactory and it worked very well....someone else with more experience in this area might like to add comments....meanwhile I will concentrate on the Audio quality on all the inputs on the K5PRO.USB PC CONNECTION.No problem with the PC recognizing the K5 PRO.....With the Bass and Treble control set at 12 O'clock I cue up one of my favourite songs, WAV of Emmylou Harris "Kern River" and immediately here a very clean, clear sound, crisp mids and highs and good firm Bass line.....next a 24/192 Hi Res of Roger Waters "The Bravery of being Out of Range".....again impressive good clean sound. (By the way I use Audio Technica ATH-WD900 cans plus a pair of OneOdio ones as well....both sounded excellent.I decide, out of interest, to compare this K5 PRO with my older Q4 (see the 5th picture for size comparison)......first thing I notice is an improvement is the Bass response of the K5 PRO, slightly less "lumpy" and also the mid-range on the K5 PRO is cleaner and a little more "forward in the mix" compared with the Q4....a smoother frequency response. All in all a really good start for the K5 PRO....let's move on to ....OPTICAL DIGITAL INPUTI particularly love watching Music videos on TV so I connect the K5 PRO to my TV via the Toslink cable and play Pink Floyd "P.U.L.S.E. "Comfortably Numb".....superb!! After detecting a very slight latency, easily cured by adjusting my TV sound setting, I thoroughly enjoy this great recording....top marks here....moving on to the S/PDIF input...S/PDIF COAX INPUTI connect my FiiO M15S S/PDIF on the 3.5mm output to the coax input on the K5 PRO and run a Hi-RES 24/96 recording of Eagles "Hotel California" and I'm immediately in the groove man!! again, top marks.By the way at all times the e.q. settings are at 12 O'clock and tests show these work very well with improvements in treble being handy on older "duller" mp3 files...I have a few at 256mbps....IN SUMMARYCan I recommend this Fosi Audio K5 PRO device?? You bet,Any improvements??....yes perhaps a 4.4mm balanced headphone out would be nice and I found the indents on the e.q. controls not always easy to see and I would like to have a slightly larger volume control knob like on the Q4....but really I am splitting hairs as this is a really good little DAC with excellent sound quality.Highly recommended and I hope this helps you.

I've been using this since I bought a pair of Hifiman he400 headphones and finding that my PC motherboard was impotent for driving decent headphones. For the price it is down the cheaper end of DAC amps but it's served me well.I've purely used optical input as I used to experience electrical background noise via other connections but it's been more than up to the job. The Sundara headphones I most recently purchased have found the limit of its ability but it is even still able to drive them to a very acceptable standard, I'm upgrading to see if they react better to a stronger source (as well as balanced output which I don't believe this unit can do).To be honest I would have been fine with the volume and quality as things stand, it's already able to hit levels that are not ideal for the ears and create bass as smooth and low as you could want at this price point.The point that goes against it hitting 5/5 is the volume knob which hits max at about 90% of it's rotation. More of a 4.5/5 but not worthy of full marks.Other than the sound side of things it's very well made, the knobs are a little cheap in feel and hard to see unless lit up with just one small detent on each so you can feel them stop at the 12 o'clock position isn't ideal but gives some feedback to go in blind with.I highly recommend this based on how it's performed for me, being able to run planar magnets is quite a plus point and the fact it's been turned on near enough 24/7 since April '23 has to be worthy of some credit.