SK02 DAC Amp Headphone Amplifier Desktop USB C to AUX Digital to Analog Audio Converter Adapter Preamp Optical to 3.5mm 4.4mm Balanced Combo for Home Audio System

I picked up the Fosi Audio SK02 because my PC’s built-in audio was starting to feel limited, and I wanted a small desktop unit that could drive my headphones better while also handling optical input from my setup. The mix of USB-C, optical, 3.5mm, and 4.4mm balanced outputs looked practical for everyday use without taking up much space.Going in, I expected a clean-sounding DAC/amp that could push regular headphones and some planars without noise or strain, plus basic preamp use. It mostly delivered. The aluminum case feels solid and sits steady on the desk. The big volume knob is smooth, and the gain switch plus LEDs make it easy to see what’s going on. Plug in via USB-C or optical and it just works—no drivers needed on my end.Sound is neutral and clear. Bass stays tight, mids are open, and it has enough power on the balanced 4.4mm side to give harder-to-drive headphones some headroom. I use it for music and gaming, and the quieter background helps pick out details better than the motherboard jack. The line out also works fine if I want to feed a powered speaker or another amp.For daily desk use it’s handy—connect the PC or a TV via optical, switch headphones quickly, and keep the volume independent. Value feels solid for what you get in power and inputs at this price point.A few things keep it from being perfect. The treble can come across a bit linear or bright depending on the headphones. It always needs USB-C power, so it’s not fully portable. And there’s no app or fancy tuning options if you like tweaking on the fly.It met my main expectations for cleaner desktop audio and enough power without complications. Not the last word in refinement, but a practical step up from basic PC sound that does the job well.

Excellent sound, and as a desktop DAC/Amp, this thing should be fed by a USB port with some real power capacity (or at least not a portable like a tablet or phone).They seem to be able to drive my 300Ω Sennheiser to dangerous volume levels without distortion. I'm not in the habit of listening at that kind of volume for very long.I don't hear any noise or distortion at any volume, in fact - the DAC & Amp are both excellent. The build quality appears top notch, though the case is clearly an area where some cost cutting happened (it's a bit of a generic case, but serviceable).The bottom of the case has some non-slip silicone pads integrated into it. I wish it covered the whole bottom, but it's still better than nothin'. It's also nice to have an optical in. I'm not sure if I'll ever use it, but options are good.I love being able to use the push knob to pause/play skip music, and even turn the SK02 off (rather than an always-on power sink).I bought mine with a package deal that was cheaper to get an Orange knob - I'm not entirely sold on the look, but it's certainly easier to find the knob.The SK02 a bigger amp than the diminutive Fosi DS2, and is definitely louder. It also has more features. I've got both, love both - they're different horses for different courses.

The Fosi Audio SK02 DAC amp is a compact, affordable option with a clean, neutral sound signature, making it ideal for detail-oriented listening. Powered by the ESS Sabre ES9038Q2M DAC, it offers clear audio with a slight emphasis on mid-to-high frequencies, which suits analytical listening but can be bright for sensitive ears. It includes both 3.5mm single-ended and 4.4mm balanced outputs, delivering up to 1100mW to power even demanding headphones. Its sturdy aluminum build, versatile connectivity, and intuitive volume control make it a practical choice for budget-conscious users​

I like the look. Like it the sound. Liked the features. Works well in Windows, but in Android doesn't. Fosi needs to update for Android.

Although I returned this Fosi Audio SK02 DAC Amp Headphone Amplifier I am giving it 5 stars because for what it is and for it's price I think it's a good value and performed well for me while I was trying it out. One of the reasons I considered this product was because of the high headphone power output and inclusion of both single ended and balanced headphone outputs. The power was definitely sufficient to drive all the headphones I own (Sennheiser HD6XX, Sennheiser 560S, HiFiMan Edition XS, FiiO FT1, Grell OAE1) although I didn't try it with some vintage 600 Ohm headphones I own. However, I returned it because I really needed to be able to see the volume level that was set more clearly than what the small led light could indicate. That single light was too vague to know where in the scale the volume was set. I have opted to choose another product that has an led screen which can constant show the volume from 0 to 99 at all times. This may not be a consideration for other people however. I also liked the form factor and design which took up less space on my desktop than the other product I ended up selecting. So, in summary, I consider this a very good product that unfortunately just didn't meet my specific needs. If the lack of constant volume level indicator and led screen isn't an issue, then you would probably be happy with this DAC/Headphone Amp.

Bought this to power a pair of bluetooth speakers hoping to get more volume when using my PS5.Works as advertised,plugged in to a wall outlet using usb adapter,and optical cable to tv.Sound was crisp and clear,but about the same volume levels I was getting using bluetooth via my av receiver,as my av receiver has no headphone jack.Will try another model.

Works very well on a PC - I could not be happier for headphone listening on my PC. I use the USB input and 3.5mm headphone jack for the output. It installed perfectly on my Windows 11 PC, which recognized it right away. I don't really know if it installed any drivers, but it doesn't matter to me since it just works and sounds great. It's the best $90 I've spent on my audio/PC system. Highly recommended.

Awesome portable DAC with balanced output, plenty of power for my headphones and pairs with my Fosi SK01's like a charm. Love the volume wheel, another super cool and premium quality item from Fosi Audio. Highly recommended, 6 stars!

Very nice! I use this DAC as a external sound card for two computers, by plugging it into a USB hub into a KVM switch. It takes control of the volume output, so volume control for both the Windows and Linux machine is controlled with the dial. Tweaking the output volume in the Windows OS has no effect on the output volume, however on Linux the OS volume seems to control the gain a bit. But I just set the volume to something which sounds undistorted, and I got the same volume in both OSes. Don't notice delay in sound either. Music playback sounds great. Perfecto.

just received this morning, setup was easy, usb from P.C, which carries signal and 5v power, optical from TV used as monitor. Headphones sounded great whether from 4.4 mm balanced or from 3.5. I attached a 3.5 mm audio cable, from the aux out on rear of unit, to my active speakers and all good there too. Controls on top of unit for gain, high/low, a mode selector for optical or USB input, and a volume control knob, with an array of led lights to indicate bit rate and mode. Small yet solidly built. All the connections I need for desktop system are there and at a reasonable price.

Super ljud. Enkel och praktisk hörlursförstärkare.

Petit ampli casque qui est surprenant tellement il délivre un son puissant et cristalin.Associé à un ATH M50X, je trouve rien à redire.Qualité du boitier au top, il suffit de connecter en USB C de par et d'autre...à acheter les yeux fermés.

初めて買ったDACなので正確な評価にはなりません。ゼンハイザーHD560Sの購入に合わせて買いました。M4 Mac mini直繋ぎとは比べようがない程、音場が広がり、定位感がハッキリして、音に奥行きが出ました。その後、HS4も購入し繋げて聞いていますが、お値段の割に十分な内容と言う気がします。もっとお高い高機能のDACなら、もっと良い思いが出来るのだろうか？多分、そんなに違いはないのではないかと邪推しているので、取り敢えずこれ以上は望みません。ちなみにアマオケの生録を編集のために聞くことが多いのですが、とても向いている機材ではないかとおもいます。こんな分野に向いていると言われても嬉しくないかも知れませんが。