V1.0G 2 Channel Class D Mini Stereo Amplifier for Home Speakers TPA3116 50W x 2 with Power Supply

AN UPDATE: I liked this tiny amplifier so much that I bought a second one for my office computer. Previously, my main computer used a Lepai LP-2020A+ driving a set of decent bookshelf speakers, and my office computer used a set of cheap USB active speakers. Later I bought the first Fosi to replace the Lepai on my main computer system, and it worked out beautifully (see the ORIGINAL REVIEW below). I decided I would use the Lepai on my office computer, and for that, I bought a set of Polk Audio T15, which are probably the cheapest slightly "serious" bookshelf speakers but should be far better than those cheap USB speakers. But within minutes of setting up the system, I felt terrible. It's not that the Lepai LP-2020A+ with the Polk Audio sounded worse than the cheap USB speakers. On the contrary, they were noticeably better. The trouble was that I started to compare the office sound with my main computer system sound, and I just couldn't help it. This is what happens when you get into a better system. It spoils you. On the office system with Lepai, everything sounded so hollow and distorted, especially the vocals and human voice recordings (not singing), which was so bad that I couldn't stand. It was painful. At first I thought it might be the Polk Audio T15s, but then I suspected it was something else, including the built-in line output, etc. Speculating all kinds of diagnostic possibilities was driving me crazy. Finally, I just gave in and bought a second Fosi, with a good DAC, planning to return the Polk Audio T15s for something better as well. Well, the Fosi and DAC came in, and I connected them to the computer and the Polk Audio T15s. What an improvement! Clearly, the Polk Audio T15s are fine (although not great). The culprit was the Lepai LP-2020A+ amplifier, as the Fosi made a huge difference. The following is the original review I wrote after about the first Fosi: ORIGINAL REVIEW: Unbelievable value for a small desktop setup or computer sound system. Everything is perfect. The sound, the functions, the build quality, and the appearance. This replaced my seven-year-old Lepai LP-2020A+, which actually had quite good sound on my computer sound system as well, but left me wanting a bit more. One of the obvious issues with Lepai was the highly noticeable noise floor when the volume is turned past 50%. Although I seldom turn the volume past 50%, the limitation is bothersome. After seeing some reviews on the TI TPA3116D2 chip, I decided to upgrade, to just give me a bit more peace of mind. And I am very satisfied. The Fosi sounds great. To be honest, I did not do a side-by-side comparison with the Lepai, but I am pretty sure Fosi delivers cleaner and fuller sound. The noise floor is much lower. It is quite low even if you turn the volume all the way up to the maximum. On my desktop speakers, I can hear no noise when the volume is below 30%. Once it passes the 30% level, the noise floor steps up abruptly, but strangely enough, it stays quite flat after that and does not further increase too much even if you turn the volume all the way to 100%. Even at the maximum level, the noise is only slightly noticeable when I sit about five feet away from the speakers. This is a near-field environment, and I'm fairly picky about the noise, but still, this is completely manageable. A day-and-night difference compared to Lepai LP-2020A+. Fosi comes with a rather large power supply, which may seem unnecessarily large, but is necessary for its 50W x2 power rating. When it comes to power, you simply don't have any way to cheat. For example, having a 30 W power supply for 50 W x2 = 100 W amplifier will inevitably lead to insufficient amplification and distortion at higher volumes. Also, the fact that Fosi has five-way binder posts for speaker connectors is a plus, much better than Lepai's primitive clippers. I did hesitate in choosing between the Fosi (this unit) and Micca OriGain A250 or OriGain AD250. OriGain A250 is $20 more expensive, not a lot in the dollar amount, but one-third (33%) more in relative terms, which becomes a matter of principle, if not affordability. Still, I almost got OriGain A250 instead of Fosi V1.0 because the A250 has slightly better user review ranking, and I desired peace of mind. But then I saw reviews that mentioned OriGain A250's having heavy bias on the left channel at low volume level. That bothered me as I usually listen to background music at quite low volume levels. OriGain AD250 had its own attractions because it had a built-in ADC and USB sound input. However, in the end, I decided not to go that route because integrating ADC may appear convenient now but could be an invitation for trouble further down the road. What if the built-in ADC develops problems? (I did see one reviewer mentioning OriGain AD250's built-in ADC has a signal synchronization problem). Or what if you want to upgrade ADC? Etc. Anyway, I'm glad I settled on the Fosi. It leaves me wanting nothing more for my computer-based desktop system.

The Fosi Audio V1.0G is a fantastic little Class D amplifier. I was genuinely impressed with how well it performs for its size and price. I paired it with some very efficient speakers and a separate phono stage for my daughter’s record player, and it turned out to be exactly what we needed. The sound quality is clean and surprisingly full. It delivers more than enough power for a small to medium room when paired with efficient speakers, and it does so without distortion or harshness. The simplicity of the 2-channel design is a big plus here — no unnecessary features, just volume control and solid amplification. For a compact amp, it feels well put together and runs cool. This is a great option for turntables (with a phono preamp), desktop audio, or any simple stereo setup where you want good sound without spending a lot of money or taking up much space. For the price, it punches well above its weight. TL;DR: Excellent small Class D amp with clean sound and plenty of power for efficient speakers. Simple, affordable, and perfect for a basic 2-channel or turntable setup.

I bought this amplifier to connect my passive Sony tower speakers to my turntable, and it is an amazing amp for its price. Compared to other options in its price range, this amplifier is leagues better than anything else on the market. It was fairly simple to set up, and due to its small footprint, fits amazingly in my compact setup. The sound quality on this amplifier is impeccable. It is dead silent when no music is playing, and there’s no humming or noise that interferes with the sound at all. Also, it looks great. It has a sleek design and a nice metal finish, along with great build quality, and it’s a perfect addition to any stereo setup.

Who is FOSI? The box says it is Shenzhen Foresight Technology LTD. The FOSI website is gone. The same amp is sold as "Nobsound Mini" and "Breeze Audio" (maybe more). It is CHi-Fi with a chip from T.I. (at least I hope it is a REAL Texas Instruments TPA3116 I.C.) Small and nice looking with a huge 120 Watt power supply. It is almost like these amps were designed to use up the remaining stocks of obsolete laptop power supplies. Some of the P.S.s even say "HP", but mine said FOSI. The connector is too long for the power jack on the amplifier, so do not try to push it all the way in. The coaxial power plug hangs out about 5mm, because it is too long for the jack. Pretty basic stereo amplifier, one input (RCA) and one set of R&L speaker binding posts (very small and tight), a power switch, volume knob, and no tone controls. No mini 3.5mm audio input either, but you can buy a (stereo) adapter cable if you need it. I took a peak inside (despite warnings about "No User Serviceable Parts). The circuit board is good quality and nicely laid out. The components are mostly "value grade". The circuit pretty much follows the basic T.I. reference design from the application notes. Output torroid inductors are very close together, and un-shielded, but torroids are not supposed to interact. I will say, this "could" be one of the FEW small amplifiers with an HONEST RMS power rating. If it really has a T.I. TPA3116 class D circuit, (can't see, it's covered by a heat-sink) then that I.C. is rated 50WPC x2, and the power supply has more than enough capacity to keep up with the power demand. The amp does play "loud and clean" with no clipping at reasonably high volume levels. (However, I did not turn it all the way up!). There are independent (not mine) lab tests, that indicate it will run at rated power into 8 ohm speakers, but only meets spec. THD+N up to 21.6 WPC. Into 4 ohm speakers the amplifier reportedly shuts down on an overheat condition when producing more than 20 WPC continuously. Music is different than lab tests, so your mileage may very. How does it sound? It sounds very nice, far beyond what you would expect for what you paid for it. I listened to 24bit/96kHz high definition audio files with it, and it sounded slightly better than my "modded" Tripath class T, LP-2020A+ Amplifier, and of course, this is much louder too. I knid of like the "sound" of the LP-2020A+ (probably because I am usually a Vacuum Tube Amp guy) but this amplifier has more upper mid-range detail. It could also be that my speakers were just more compatible with the TPA3116, because the more powerful amp has a higher damping factor. Not sure how long it will last, but if it fails, I will have a very nice enclosure for my next D.I.Y. project

Took a gamble on a brand not well known in audio and for $50 my gamble was well worth it! I use it as an amplifier from my vinyl record player to my two bookshelf speakers, and i couldn’t have been more impressed with the ease of use and sound quality i got from it. As I’m relatively new to vinyl listening, I needed something small that went from rca to speaker wire, and I didn’t really care for all the bass treble stuff. As cool as it would be in the future, more moving parts leads to more ways to failure. So i fell on this little guy. Very solid and not cheap feeling, and nice rubber feet on the bottom to keep it from sliding around. Volume knob and the on and off switch feel nice. The speaker wire outputs support banana plugs, which is a nice to have. Theres not a lot to say about it besides that it works wonderfully at the moment, hopefully time proves to be fruitful.

Works like a charm, just what I needed. It was a replacement for the old one.

So, I bought this little unit in 2020… 4 whole years ago… and finally found the time and the need to use it. Boy am I pleasantly surprised. Paired with my various Klipsch speakers (mostly using my giant corner horns at the moment), this amp sounds amazing. It really does. And I'm quite nitpicky when it comes to sound quality. I'm used to various amps, including vintage Sansui, Marantz, Kenwood receivers and vintage and newer Mcintosh, which all sound different. I'm using an (too expensive) ADI 2 Pro DAC converter that has phenomenal sound reproduction characteristics, so if the end result is anything less than great, it's this little amps fault. I'm glad to say that it sounds very crisp and clean, very much like the Sansui AU-919, which was designed to provide very faithful reproduction of the original music. In fact, it sounds just as good as my AU-919. It is the exact opposite of the "warm tube amp" sound, similar to the sound that Marantz and Macintosh amps are known for. If that's the sound you're looking for, this isn't the amp. You could use a preamp to tweak the sound, if you wanted to, I suppose. The most important thing to remember is that this amp is "only" 50 W, so the more efficient your speakers, the better the sound is going to be. Klipsch speakers can get very loud with just a couple of watts of power. I have a 17 W tube amp and I can't turn the volume more than 50% or the sound will be so loud it's unbearable. So 50 W for my speakers is more than enough. If you have speakers that NEED 50 W, you probably will need something more powerful… and there are different models of this amp that will work better for you. This amp would be perfect with a surround sound system… One amp for each channel. Now that I know how well this unit works, I will definitely be buying a couple of more of them to add additional speaker pairs. I've seen some others say that their unit gets really hot. Mine doesn't… not at all. Probably because I'm not using all 50 W. This goes back to pairing it with the right speakers. I set the volume on the amp to 50% and then adjust the input to get additional volume. If you are having to run the volume on the amp at 100% all the time, you definitely need an amp with more power… 100 W or more.

I was using the fosi 50x2, and decided I wanted a bit more wattage, so I moved up to the 100x2 version with bluetooth. The 100x2 has a larger power supply giving you 24v power instead of 19v power. Both the 50x2 and the 100x2 will spark when you plug in the connector on the back which is scary. If you plug it in first, then plug in the power block to the outlet it will not spark. The 100x2 has individual controls for Bass, Treble and Volume. The 50x2 only has volume control. The 100x2 has bluetooth. When I bluetooth my iphone xs to it and play via my Music app, the sound is terrible. Everything sounds great when I play my TV audio via the toslink->rca via a DAC. But when I sync my phone on bluetooth, its so bad. I will record a video of it later and update my review. For the extra money, its worth having more wattage and bass/treble control. But dont buy for the bluetooth. Both are great for powering a 2ch system. And they are so small they hide nicely, whch is what I needed. The nobsound is basically same product, and the 100x2 version is about $15 cheaper. Link provided below. Nobsound 100x2: https://amzn.to/31wtDhz

I have had an old set of Dell PC Speakers (2 speakers plus a sub-woofer) for many many years. They were quite well made and had an adequate sound (volume and quality) from my computer - mainly listening to Spotify. However they stated to fail with increasing noise, static and fading volume - it may be just a dirty volume control but I was not sure so I had been looking for a replacement for some time, but nothing really looked like what I wanted - everything these days looks quite cheap and plasticy. However I also had a pair of Wharfdale Diamond 2 speakers from my old (no longer used) stereo system. These are actually relatively small but high quality speakers so I decided that a better strategy might be to deploy these speakers with a (physically) small amplifier and came across this Fosi device. I left this in my basket for a long time as well but finally got it on an Amazon discount week making it much more reasonably priced. I was not sure what to expect as I had used the speakers before with a traditional large Pioneer traditional (and large) stereo amplifier. This device is tiny - much smaller than I expected - the power brick is about twice the size of the amplifier! The photos show that the connections at the rear fill the panel. I also bought some banana plugs for the speaker cable (some quality QED flat twin and 3.5mm jack to phono cable and connected it all together. I really am impressed with the quality of the sound output with these speakers. I have had the volume at the maximum setting and it was really clean and clear, with a decent frequency range (using the Realtek graphic equalizer application) and minimal distortion, so I am pleased with the outcome and it reuses my speakers that had been in the loft for years In terms of the amplifier, it doesn't get hot even when running at high-output for long periods of time. It's quite well made - a reasonable level of perceived quality. I had one trivial issue that the volume knob fell off but it just needed the grub screw tightening a little more. I think the the power switch seems a little lightweight and could have been a little more robust looking but these are minor nitpicking issues Really happy so far.

Compact, simple, faceile à installer, de bonne qualité, cet ampli fait le job : bonne qualité audio, assez puissant pour un living, fonctionnement durable dans le temps. Il est branché sur mon ordi avec des enceintes 3 voies depuis 2 ans sans souci et fonctionne tous les jours de longues heures !

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Lo usé para mejorar el audio de una pantalla