V1.0B

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.

Have recently refreshed my main sound system which was 10+ years old and lacking modern features such as optical input for TV sound, Bluetooth, and unable to play FLAC files. So what to do with my now upgraded & replaced Wharfedale Diamond 9 speakers. After a few hours research I bought this, hooked it up to my PC and the speakers, replacing some basic Creative mini-speakers. Even found just enough old Chord Carnival Silverscreen speaker cable at the bottom of a drawer. Pound for Pound this has to be the best £40 I have ever spent on audio equipment. The sound is amazing coming from a basic £300 computer. The mike on my phone really does not do it justice. Need to get them up to screen level ASAP though

I was surprised at the small size, I was expecting something slightly bigger, the sound is clear and has good bass/mids/treble. It's alarmingly powerful, I have tested it through a set of vintage Warfedales as well as some more modern wharfedales and a few other sets of speakers. My reason for buying it was because i needed an amp to play those speakers I mentioned as previously I was sending a signal directly to them from an audio interface for reference, in my home studio. I am very satisfied with this little amp. Well worth the price I paid.

Got this to replace an old hi-fi separates amp used to handle the sound on one of our computers. Perfect, sound is excellent and the desk now has more space on it. Ideal for the user as it's dead simple to use.

Professional quality - Bought one to drive my old Yamaha NS10 studio monitors, very good quality, no hums or hisses, punchy, loud enough, very well made all metal, low power consumption, power supply, volume knob, switch and connectors all solidly made, does not even get warm. I would not hesitate to buy another one if needed. AAAAA++++++

Excellent little amp. Am using it to drive a couple of old Jamo Sonic speakers (long term power: 50W, short term power, 105W, 8Ω impedance) via an audio interface attached to my laptop. Bought a couple of banana connectors to make connecting the cables easier, but connecting bare wire to the binding posts on the amp unit actually turned out to be easier than trying to get the screws to fit in the connectors. I had wondered whether the amp would have enough ooomph to get sufficient loudness out of the speakers - happy to report that it got louder than I'd dare listen to music at well before reaching maximum volume. No noticeable distortion within normal listening range. If you're only going to be using one input then it's a no-brainer, especially for £40.

I don't usually do product reviews but I am blown away by this for the size. Paired with a set of Wharefdale Diamond 3 speakers and it sounds great. Incredible for the size.

Only one star as the power supply for the amp was dead on arrival. So I can’t leave a review NOT A GOOD COMPANY TO DEAL WITH

TB petit ampli de classe D. Utilisé en ampli externe d'un ampli home cinéma Marantz pour alimenter 2 enceintes Dolby Atmos arrière. Très facile à brancher. Cet ampli n'est effectivement pas très puissant mais il suffit à alimenter la plupart des enceintes et ne produit aucun bruit parasite. Il accepte les fiches banane. Il n'a pas de télécommande. Rapport qualité prix exceptionnel. Et s'il tombe en panne, à ce prix là, pas de réparation, on rachète un neuf !

El equipo es de buena calidad. Tiene un sonido limpio, la música se escucha genial y sin ningún ruido de fondo, con un completo silencio en vacío. En mi caso, con altavoces de 6 ohmios, tiene potencia de sobra para un salón de 20 m2, para mí es suficiente no pasar el potenciómetro mas o menos del primer cuarto de su recorrido. La verdad, me ha sorprendido, los amplificadores tipo D tienen mala prensa entre algunos audiófilos, pero a mí, me ha parecido que tiene un sonido muy agradable. Muy buena relación calidad precio, por poner una pega, no parece tener protección antipop y si lo dejas encendido y lo activas directamente desde el interruptor de una regleta, por ejemplo, puedes escuchar ese temido pop que podría llegar a dañar tus altavoces.

Piccolo ed ottimo amplificatore con il noto e ben suonante chip 3116. Realizzazione ottima come materiali e finiture. L'amplificatore viene fornito di alimentatore, cosa non scontata, funziona benissimo senza il minimo rumore o ronzio. L'unico piccolo difetto sono i connettori per i cavi di potenza, piccoli e scomodi, superato prendendo le banane per cavi di Amazon Basic, veramente ottime.

C'est le deuxième ampli Chinois classe D que j'achète, ayant été conquis par un modèle d'une catégorie supérieure bien que ce petit Fosi Audio ne démérite pas non plus. On peut se demander à juste titre si ces nouveaux amplis Chinois ne rendent pas obsolète les amplis HIFI de classe AB traditionnels d'entrée de gamme car ce Fosi Audio offre un son excellent qui surprend vu la taille de l'appareil avec son transformateur de 19V. La course du volume est régulière, progressive et équilibrée et on restera en-deçà de 10h la plupart du temps même avec des enceintes de rendement faible. Scène sonore, pureté des timbres, clarté et dynamisme, à l'écoute ce mini-ampli ne cesse de nous surprendre par ses réelles qualités acoustiques. La finition est parfaite, pas de bruit parasite, pas de souffle, pas de ploc à l'allumage, ne chauffe pas et ce qui est le plus incroyable, sa consommation électrique ! Si on reste en-deçà de 12h, avec des enceintes de bon rendement, on aura déjà pas mal de puissance pour une consommation électrique qui va osciller entre 1.4w et 2.8w ! A plein volume on arrive péniblement à 3.5w ! En écoute normale on sera donc à 1.4w (volume à 9h), autant dire que c'est un avantage non négligeable, voire devenu très recherché ! Avec le volume à fond, on entend aucune distorsion ce qui est surprenant, cela dit sa puissance reste limitée mais à mon sens suffisante si on le branche sur des enceintes ayant un bon rendement. Par contre, il faudra privilégier des fiches bananes si on veut utiliser du câble de 2.5mm, les borniers n'acceptent du câble que jusqu'à 1.5mm apparemment (ce qui n'est pas un problème). Le boîtier étant léger, il a aussi tendance à basculer si on utilise des raccordements arrières trop qualitatifs (lourds). A mon sens ces nouveaux petits amplis Chinois en classe D rendent désuets les amplis HIFI classiques des grandes marques d'entrée de gamme (pour le moins) sauf si on recherche plusieurs entrées, des réglages de tonalité, une balance et une télécommande. Chacun pourra trouver une utilisation à ce petit Fosi, mais pour moi c'est l'ampli idéal à portée de main à côté d'un ordinateur et branché en sortie d'un DAC. Il pourra être utile aussi dans une seconde pièce mais l'absence de télécommande le rend moins intéressant pour regarder les films qui demandent souvent de corriger le volume pendant le visionnage. Je ne vois aucun défaut à ce petit ampli, le prix est attractif et son look minimaliste trouvera facilement sa place sur tout bureau ou étagère. Fortement recommandé. En espérant que mon commentaire vous sera utile.

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.