Fosi Audio V3 300W Class D Stereo Power Amplifier, TPA3255 Chip HiFi Audio Amplifier for Home Theater and Bookshelf Speakers, Compact Design with Advanced Heat Dissipation with 32V5A Power Supply

Bought this for my study, with a 32V power supply, to drive a couple of small, 6 Ohm, Quad desktop speakers. The foot print is perfect for a desktop (it has replaced a full size integrated amp and leaves me a lot more space). Seems very well put together, suitably weighty, nice heavy case. I like the logarithmic volume pot, it works very well in this application, although I see that some other people don't. The power LED is bright enough to see, but not distracting. I find it is very nice to listen to, good detail, pleasantly lively. I'm quite fussy about audio gear and wasn't sure whether I'd like this, but I am impressed. Sound quality is remarkable, given the small size and the very reasonable price. I might even treat myself to an orange volume knob for it.

There will be all sorts of great and well deserved reviews of this amp but one thing I wanted to show was the actual electrical power usage of this fantastic little amp. See attached picture. This FOSi Audio v3 amp is using only 3W when driving a pair of Wharfedale 9.1 speakers @6 ohms. Fed by a WiiM Pro streamer with it's output audio set at 95% That's absolutely incredible in this day and age of high electricity prices, incredible. Previously was using a Harman Kardon AVR130 and it's power usage was nearly 70W on idle, not even playing anything. Amazing clean sound from the amp and it drives the 6 ohm wharfedale speakers effortlessly. So happy with this lovely little amp, amazing price too. Would've liked if it came with a remote, otherwise it's perfect!

I'd seen stellar reviews of this amp on YouTube and got it when it appeared on a deal of the day. I tried it in place of a Denon RCD-M37DAB mini system in my kitchen, with Wharfdale Diamond 9.1 speakers. After switching between the two several times I couldn't make out any significant difference between them. In its day (2008) the Denon was winning awards and high praise, so this tiny Fosi amp matching that performance for silly money is an achievement in itself. However, in no way is it the 'giant killer' that some reviewers claim. For a start, the 300W power rating is a joke. Digging into the Fosi website shows that to be with a 48V 10A power supply, that Fosi apparently doesn't even make, let alone supply! It's also at the clipping point of the amp and so would have awful distortion. With the 32V standard supply in the box, I've seen reported test results of 30W into 8 ohms and I think that's probably about right, given the volume I was able to get in my fairly small kitchen, with the volume knob turned up over half way producing 75-80dB. So in conclusion this is a nice little amp that is perfectly suitable for small rooms, at least with the 32V supply. At the price it's brilliant value for money, as long as you don't buy into the hype and expect too much from it.

Top notch sound at a great price.

I liked the V3 so much i bought a second one the next day. I have connected the output of my Allo Boss Dac to both V3's one driving tweeters the other bass/mid. This has further improved the soundstage, detail and dynamics. The B&W 684 S1 reveal the detail however the sound could sometimes be warmer, probably due to recording shortfalls. A lot of detail for not much money, i even have some tonal control with the individual V3 gain control. I will try using each V3 for each channel soon. The V3 will highlight the quality of your source signal so ensure it amplifies as clean signal as possible.

Great little amp to go with my Marantz streamer. No frills Chi-Fi but powers my Ae109 floorstanders no problem. Using 32v supply so probably even better with 48v.

Wow. The sound from these are almost as good as my Cambridge audio sr20 which I bought for over £400 iirc. That's with the standard adapter. Annoyingly when I bought this it didn't come with a 48v adapter bundle so I had to buy it separately but with that the sound is actually better than the Cambridge audio. Audio quality is extremely detailed and bass is super clean and rounds out the sound very well. I'm using these with Dali opticons but unless your using speakers that are hard to drive or can run on lower wattage then you'd probably be fine with the standard adapter. That said the 48v really just added that something

this is NOT 'hifi' - it is an amp capable of an acceptable sound given the right speakers and source, but you won't get dynamic range or transient attack and presence, and the reason is that the bandwidth is compressed mp3 have compressed bandwidth so you might not notice - HD sound does not and it will not sound as it should compressing the amp bandwidth does help such a simple device to sound better than it would otherwise, but it has coloration accross the spectrum, highs are a bit squark, lows thump rather than punch, cymbals muffled 300W per channel is the theoretical max for these Class D output modules and you won't get it without an upgraded power unit and speakers 2-4 ohms - and when you do get it you'll get a higher rate of distortion - effectively it's an 'on-paper' spec, not so practical in the real world I fed this amp into 8 ohm speakers and should have got about 35W per channel, however cranking it up above 2-o-clock on the dial stated to sound harsh... does any of this matter? not if does the job you want it to, within it's limitations - it is not expensive, it works out of the box - more for background and surfing audio I think, maybe upgrade some basic laptop or phone audio...

Ho acquistato il Fosi Audio V3 con molta curiosità dopo aver provato diversi amplificatori di classe D (tra cui Aijima) sono rimasto colpito sin dal dal primo ascolto. Sono un appassionato hifi da circa 35 anni, utilizzo anche amplificatori Mc Hintosh, ma ero davvero curioso di provare un oggetto così piccolo ed economico un grado di mettere in discussione le convinzioni dell'audiofilo più conservatore. Stiamo parlando infatti di un amplificatore senza fronzoli e colorazioni, con la sola manopola del volume, ma che assolve egregiamente al suo compito: SUONARE BENE! Naturalmente il tutto va inserito in un contesto adeguato che ritengo sia essere un ambiente di piccole o medie dimensioni oppure, come nel mio caso, un sistema audio da PC con monitor. Ho realizzato un impianto con il DAC Topping E50, Fosi Audio V3 e le ottime Cabasse Surf (piccole ma testarde con un efficenza di 85 Db su 8 Ohm) devo dire che sono più che soddisfatto del risultato ottenuto, testato con diversi generi musicali il suono risulta abbastanza lineare ma non privo di dettagli e dinamica; bassi rotondi e mai invadenti, alti molto dettagliati e puliti, le voci che spiccano per naturalezza. Insomma un piccolo gioiello che sicuramente vale molto più di quello che costa e che ti lascerà a bocca aperta ! Riguardo la potenza dichiarata di 300 W per canale va considerata con un alimentatore da 48V 10A per un impedenza di 4 Ohm, nella maggior parte dei casi invece, ovvero con l'alimentatore di serie da 32V 5A, tiriamo fuori una potenza di circa 50-65 W rms per canale su 8 Ohm, una potenza di tutto rispetto soprattutto perchè priva di distorsioni al massimo volume. La manopola del volume ha un controllo di tipo logaritmico, per cui bisogna girare parecchio prima di avere un buon volume di ascolto ma non abbiate paura di farlo; il grosso della potenza è nascosto nella parte finale. Sulla componentistica interna vi rimando ad altre recensioni più dettagliate, ma sicuramente l'ottimo TPA3255 (già presente su Aijima A07 e Fosi Audio BT20A) assieme ai celeberrimi Op amp NE5532 costituiscono ormai un abbinamento collaudato, ma il Fosi Audio V3 si differenza dai suoi rivali per l'utilizzo di una componentistica interna di alta qualità, in particolare condensatori ed induttori Giapponesi e Tedeschi. (potete trovare ulteriori dettagli sul sito ufficiale) e vi assicuro che la differenza con gli altri amplificatori si sente, e si sente davvero bene:) Degno di nota anche l'originale sistema di dissipazione del calore posto al di sotto del chip e collegato a tutto lo chassis; un sistema davvero molto efficiente che difficilmente manderà l'amplificatore in protezione. Molto interessante inoltre la possibilità di sostituire gli Op amp con un altro modello, sul sito Fosi Audio potete trovare alcuni consigli tra cui gli Sparkos SS3602, MUSES02, OPA2604AP, OPA2134PA ecc... (la lista è davvero lunga) facilmente sostituibili perchè gli NE5532 sono montati ad incastro su un adattatore DIP8. Personalmente, preso dall'entusiasmo del nuovo prodotto, sto testando il Fosi AUdio V3 con i nuovi Op amp ORACLE II-02, il risultato è davvero entusiasmante, ne scaturisce un suono non migliore di quello prodotto dagli NE5532, ma sicuramente diverso, più caldo, molto più simile agli amplificatori tradizionali o, se preferite, ad un valvolare. Insomma il Fosi Audio V3 rappresenta davvero un grande balzo in avanti per l'azienza sperando che continui su questa strada; un prodotto chenon ha paragoni nella sua fascia di prezzo e che per come suona vale almeno 5 volte di più. STRACONSIGLIATO !!!

The Fosi V3 Stereo Amplifiers are the most value of money stereo amplifiers available in the market right now. I was thinking of going for a Class AB Analog with Toroidal Setup, but this is much better in terms of efficiency, small footprint, ease of use, and output - Crystal Clear, lot of power for 6-8 ohms drivers. Both of them run at 32V 10A Power Supply and can get plenty loud without too much load dependency (Peaking) in my use case. This can be a true workhorse if you're using a dedicated 42V PSU. These can run all day without any hassle. Class D with a good implementation looks like this. Only missing PFFB which is available in the Mono Version which eliminates the load dependency issue.

Ich war mit den klanglichen Eigenschaften meines AV-Recievers nicht gänzlich zufrieden und überlegte eine entsprechende Endstufe zuzulegen. Generell ging es mir nur um den Stereoklang. Die Preise schossen mit der Größe der Geräte ins astronomische. Ein technisch versierter Bekannter legte mir nahe, mich bei Fosi Audio umzusehen. Kurz entschlossen kaufte ich den V3. Die beste Entscheidung. Da ich große Lautsprecher mit einem eher weniger günstigen Wirkungsgrad bei mir habe, war ich erst etwas skeptisch. Die Skepsis verflog schnell. Die Kombination lässt keine Wünsche offen. Transparentes Klangbild. Sehr linear. Sehr gute Ortung. Ich habe mit dem V3 den größt denklichen Spaß. Die Vorurteile gegen Class D-Verstärker sind absolut unbegründet. Im Gegensatz zu „audiophilen“ Class A-Verstärkern ist die Wärmeentwicklung minimal, so das ich im Winter doch auf die Zentralheizung zurückgreifen muss. Mögen „High-Ender“ es für unbedingt lebensnotwendig erachten, hier kiloweise Geld auszugeben, bitte sehr, kein Problem. Ich bin kein Hifi-Enthusiast, aber war lange als Musiker tätig und Vielhörer im Bereich Klassik und Jazz. Der V3 läßt für mich keine Wünsche offen. Den Rat von den berühmten, natürlich völlig neutralen Testzeitungen, brauche ich nicht. Ich habe, mehr aus Spaß die Operationsverstärker ausgetauscht. Hat die Sache noch ein wenig in allen Punkten verbessert. Fazit: Bester Kauf ever. Sicherlich kann man statt 100,-€ auch 20000,-€ ausgeben. Die Wirtschaft bringt das in Schwung. Ich brauch es nicht und halte es für audiophile Kaffesatzleserei, die die Mehrausgaben für mich nicht rechtfertigen. Sicherlich stärkt der Kauf von großen Boliden die Persönlichkeit. Darauf verzichte ich und bedanke mich bei Fosi Audio.

super

Superb sound, powerful performance, minimalist design