Fosi AudioK5 Pro Gaming DAC Headphone Amplifier Mini Hi-Fi Stereo Digital-to-Analog Audio Converter USB Type C/Optical/Coaxial to RCA/3.5MM AUX for PS5/PC/MAC/Computer

This thing is amazing. It's a DAC/AMP all in one. It's sleek, feels very well made, and the audio coming out of it is amazing for my new FiiO FT1's I'm using. I've paired the FiiO FT1's with a ModMic 3.5mm version.I thought the headphones at first were really, really nice. Massive upgrade in sound quality from the Steel Series Arctis 7 Wireless. But I was experiencing a volume limit with my mobo powering the FT1's. When I plugged in the amp for the first time --- which is SUPER easy if your PC has a USB-C port. All power/audio goes through the USB-C port, so from the backside, all you need to plug in is the Fosi Audio DAC/AMP USB-C into amp, then into your PC. No drivers are needed, it's literally plug and play.Man-oh-man, when I powered it on for the first time it was like experiencing nothing I've ever experienced in life before. It's made me an audiophile of sorts now. I can never go back. The sound quality paired with the FiiO FT1's is incredible. The fact you can change bass/treb on the fly is amazing. I would've loved one more knob for mids, but honestly, the knobs are very well built. The Bass/Treb have a detent in the middle, so if you are in low light, it's very easy to find where you are on the EQ.I was able to route the USB-C cord around my PC, so now this little Fosi K5 pro sits neatly right next to me, within reaching distance, and the entire experience is fluid.If you have some true HiFi headphones, and you are powering them via your mobo, I get it, you're getting a great experience. For $80 this thing transforms the experience. Video games feel like movies. You can power them to higher volumes, you can tweak Bass/Treble on the fly, and this thing is built solidly.When I plugged it in, I raved to my friend who has Beredynamics 770's.... he caved and bought a Fosi Audio K5 as well. He thanked me for weeks. The audio coming out of this thing into some quality headphones is nothing like I've ever experienced. Everything else -- car audio, audio via my laptop to some crap headphones --- none of it compares. It will change your listening experience 1000%.Would recommend this to anyone.

I have an Edifier T5 subwoofer connected to a pair of R1280Ts. When connected directly to the computer's 3.5mm output, the subwoofer was uncontrollable - it shook the house no matter what I did to the volume, EQs, whatever. I had to basically turn it off.Now, I run a USB cable from the PC to the K5, and RCA cables from the K5 to the subwoofer, and more RCA cables from the subwoofer to the speakers. After setting the low-pass filter on the subwoofer to just over where the speakers drop off, the sound is crystal clear with bright highs and thrumming lows (without dominating the whole sound). The fact that I can instantly control the bass and treble on the K5 is a huge plus.I am thrilled with the K5, and it was a very cheap solution to get the most out of my not-so-cheap speakers.edit: Okay so its not PERFECT. This is going to take some explanation. If you're planning on using powered speakers on a PC, this applies to you.Everything was fine until my GPU (RTX 2080) came into play (firing up a game). The computer began sending a ton of interference down the USB connection to the F5. More expensive units I'm told can filter this out, but the K5 can't. Now this isn't necessarily the K5's fault. Computers are electrically noisy, and if I replaced my PSU, motherboard, GPU, or all three, that might solve the issue. Since that would be insane, I instead opted to power the K5 through a source other than the PC (outlet will do fine) and use the optical input (toslink) for data. Since toslink uses light to transmit the data, it is immune to EMI interference. Perfect sound. The only downside is my audio is running through my Realtek onboard audio again now; which I'm not thrilled with, but really isn't a problem.If you're using headphones, this probably won't be an issue. And again, this really isn't a knock on the K5, they do say they're for headphones and not powered speakers (probably because they don't have the electronics to filter out the type of noise I'm describing), but if you're planning on using this device for speakers, just a heads up on the USB audio combined with a powerful GPU.On a final note, I did hack a USB cable, cut the power/gnd from the PC and connect that to another USB cable going to a separate power source. It did eliminate the GPU-related noise, but the PC was still noisy enough to introduce interference somehow (ground loop possibly? Doubtful since all power came from a single UPS). They do sell USB galvanic isolators, that might do the trick, but they're as or more expensive than the K5 itself. Optical connection will do fine.Edit2: turns out it was my speaker's issue with the aux input. I bought a separate speaker for my work computer and now I just do a direct USB connection to my computer and all interference is gone. I'd still prefer a separate power input from the USB data input in case you ran into interference from the motherboard, but I have 5o say it's perfect now

This worked great and the price is reasonable compared to other products in this space.However, mine didn't last very long. My dog got caught on my headphone cable and yanked them out of the 3.5mm input. It really wasn't that hard so I was surprised when I plugged them back in that I had no audio. I have to wedge something under the headphone jack to get full sound. So definitely a broken connection. Not really the products fault but I would expect it to be able to handle that at least once. I mean, who hasn't gotten up and walked away with their head phones on?

Very early impressions of this product as I've only had it for a day now, but this works flawlessly on my Windows machine connected via USB-C. No driver install, no crappy software to manage. Easy to configure in sound settings.Build of the device is solid, nice lil' metal box that blends in nicely to a desk. Bass and Treble adjustment knobs have a click point in the "center" as a reference point. The only thing that bothers me about using the knobs is center looks a little bit off, but it's such a small detail in the grand scheme of things.I bought the Fosi because my Creative SoundBlaster X4 crapped out on me, started getting interference and small inconsistencies of my audio on USB-C after about a year of ownership. I was happy to delete the Creative software once replacing with the Fosi! VModa Boom pro microphone comes through loud and clear, Phillips SHP 9500s come through loud and clear.

Maybe I just got a defective model but the input / output channels were mixed no matter what I did. For example instead of my voice coming through the mic, it would just echo whatever was coming through the output. Very frustrating and after doing some research apparently there is no fix.