Fosi Audio V3 Stereo Amplifier Home Audio 300 Watts x2 Power TPA3255 Class D Mini Speaker Amp 2 Channel Audio Component for Passive Bookshelf Tower Speakers Desktop Home Theater with 48V Power Supply

Ordered the Fosi V3 to replace a Fosi 20a I had purchased some time ago. The main differences are, the V3 is a more simplistic setup, promises more power per channel, and uses high quality parts internally. It can come with either a 32 volt or 48 volt power supply. Opt for the 48 volt power supply, you will not regret it. The larger more powerful power supply will get you higher volumes with better quality output On the back side of this unit are connects for a pair of speakers and an analogue input. The older Fosi 20a just did not have as much power particularly with only the supplied 24 volt power supply and fell short driving my Polk Atrium 6 speakers at loud volume. Now, I am using this as a garage system. Hence, the reason I chose to go on the cheap with this system. But....the Fosi V3 got decent audio reviews so what the heck. The garage system is a music system to accompany working on projects or the cars vs. just sitting and listening to music like I do with my home systems that cost much much more. So after connecting up an older generation Echo device to stream music, I used 14 gauge audio cable to connect the speakers to the amp. Very easy to do. The result is as you see it in the attached video. Loud enough for me and the overall sound quality is very good. So, this unit has few connectivity options but what it does, it does well. What I really like about this amp is its small size allowing me to store it in my garage wall cabinet. I would imagine this amp could be part of a home system in a small to mid size room Just be sure to match it up with a pair of good speakers. Speakers with a high efficiency rating will serve you best that is 90db or better. Recommended.

Fosi has some of the best class d amps these days. I've owned a few other brands and none of them had the power or sound quality that this amp has. While I don't think there is really 150wpc sustained effort on tap, it drives my ELAC B6 bookshelf speakers just fine, those are 86db efficient, so not easy for some small amps. I feed it from a Fosi ZP3 preamp with high bypass filter and sub out that cuts the low frequencies to the speakers and routes them to a DIY 10" 150w sealed sub.

I'm a bit particular about my audio equipment, but I didn't want to spend a lot just for my office audio, where I plug in a Pono digital music player. This amp works very well; has good channel separation and imaging. I ran some public domain two channel audio testing recordings through my setup (PSB bookshelf speakers and a Yamaha sub) I couldn't find anything objectionable.

300 wats per channel? (RMS)? not in this universe. Some dubious HiFi manufactures, back in the late '60s, used a rating system of "IPP" (Instantaneous peak power) Which was the momentary highest possible power an amp could deliver before producing more distortion than music, or perhaps exploding (hyperbole). This seems to be the case with most of these Chinese mini amps. That being said, if you can get by with a realistically rated 75 WPC X2 amp this might be a good choice, your cup of tea. Actually, it sounds pretty good especially after installing a pair of Sparkos op amps I had laying around. I'm using it to drive a pair of Yamaha outdoor speakers on our screened porch, replacing a Dayton DAT-120. This little Fosi V3 is defiantly a step up in sound quality. The size is right, the price is right, light on bass, and it works pretty well for a tiny class "D" amp. Did I mention the price?

I don't usaually make the time to do reviews but this little amp needs to be talked about. I am using it to power rear wireless surrounds, which are Jamo tower speakers in a 9.4.2 configuration. I also use it in 2-channel music and let me tell you. Just Wow. The music is so smooth and clear. The bass is thumping and just right. Movies never sounded better. This little amp with the 48v power supply is amazing.

EDIT: So i owe Fosi a very public apology. When it quit working after hooking my new to me open box purchase of a svs sb 2000 subwoofer i was angry since it had worked to well up till then it comes in a very nice small package. sounded awsome for the first 3 weeks of ownership. a couple of days ago the left channel quit after hooking up the svs. this of course happened after the "no later than" return date by about 7 days. waiting to see what kind of response i get from the company which does claim a 24 month warranty. The fosi engineer and i emailed back and forth many times and long story short my svs sub was at fault. hooked up my old sub and have been enjoying my fosi v3 again. fosi is definitely a great product!

Produces surprisingly great sound from a small box. Handles continuous use without overheating.

This amp replaced a Teac desktop stereo receiver. The sound is so much better. Very clean. It's mated to a Fosi headphone amp used as a preamp. Glad I stumbled upon it. Update: January 30, 2026 I added a Aiyima A80 that feeds the preamp. Super system. I love it!

I'm a music lover and this makes one of my favorite music devices. Delivers the best sound quality for me. Recommended.

Utilisé pour avec des enceinte spassives Q acoustics 2020i, après avoir tenté un TEAC et un Denon PMA60, le Fosi audio brille par sa puissance sans compromettre la clarté de la musique. Le son est beaucoup plus clair que sur les deux chaînes sus mentionnées qui m'ont coûtées 4 fois plus. Il ne chauffe pas ou peu. L'allumage se fait par le bouton de réglage du son, et celui-ci donne une bonne sensation de résistance (souple mais pas trop) lorsqu'on le tourne. Il y a un très léger crachement à l'allumage, mais pas de violent "pop", et aucun son à l'extinction. Equippé d'une sortie enceinte et d'une entrée RCA (je n'est pas testé la sortie "pre out"), il n'offre que le minimum syndical et nécessite une installation DAC/CD/PC pour lire du son, mais la différence de prix permet de se payer du matériel spécialisé beaucoup plus performant que sur les chaînes HIFI multitâches "tout en un". L'ensemble revenant beaucoup moins cher pour une qualité bien supérieure. II ne pèse que quelques centaines de grammes et tient dans la paume de la main, les câbles peuvent d'ailleurs le tirer vers l'arrière et c'est à prendre en compte dans votre installation. Quand l'appareil est éteint, le transformateur 48V reste allumé -prévoir une prise à interrupteur.

Premetto che sono un audiofilo da oltre 40 anni e ho avuto anche impianti di un certo livello. Da un pò mi balenava in testa di ripristinare le vecchie Linn Tukan, diffusori audiofili ovviamente passivi, che ascoltavo in ambienti piccoli tantissimo tempo fa e tenuti conservati. La scusa è venuta appena ho cambiato il PC assemblandone uno da desktop di ottime performance. Già in possesso di un discreto DAC Topping DX1 collegato alle classiche Empire in legno amplificate, mi mancava un ampli per pilotare le piccole Linn...piccole ma diffusori "duri", 87 db di efficienza. Su consiglio di un amico acquisto Il Fosi V3.....Risultato?...Sorprendente....il problema non è tanto la capacità di pilotare carichi non facilissimi, quanto la qualità del diffusore che non perdona nulla...Il Fosi è incredibilmente di qualità , non voglio dire Audiophile in senso strettissimo (ma mi riservo di provarlo nell'impanto principale) , ma riproduce il suono in maniera trasparente, dinamico, senza incertezze , senza scomporsi e senza riproporre un suono confuso (tipico degli ampli di scarsa qualità)...ripeto, vi garantisco che le Linn Tukan sono diffusori di eccellente qualità....non perdonerebbero amplificazioni scarse....a questo prezzo il risultato e a dir poco sorprendente....altamente consigliato per impianti desktop con aspirazioni audiophile.....

He adquirido otros amplificadores FOSI clase D, y no me han decepcionado. En mi caso para cadena de audio que he ideado. Mediando como cerebro un WiiM Ultra. Alimentando de señal a otro amplificador fosi -M01 BT MONO SUB AMPLIFIER-para mover un Dayton Audio BST-300EX, 300 vatios RMS, agitador de graves táctil, impedancia de 4 ohmios, aparte la misma salida DE subwoofer del WiiM ultra alimenta señal para un subwoofer activo Yamaha de 250 watts.A su vez, en esta cadena va conectado un procesador de campos sonoros Yamaha, producto Vintage de excelentes prestaciones.Y para esto , este aparato requiere de 4 a 6 canales de audio, lo tengo a 4 canales con otro amplificador FOSI. EN ESTE PEDIDO : este Amplificador Fosi Audio V3, es Amplificador estéreo de audio para el hogar de 300 vatios x2 de potencia TPA3255 clase D Mini amplificador de altavoz 2 canales. En este caso lo pedí con su Power Adapter 48v/5A. Es un "monstruo" más grande y pesado que el mismo amplificador Me agrada su aspecto minimalista,con un solo botón para encender (hace "clic") y manejar el volumen Y si , lo esperado, se calienta, yo digo lo normal. Escribiré posteriores opiniones según se vayan portando estas pequeñas bestias amplificadoras

This is an excellent amplifier. I bought two of them to drive PSB desktop speakers and Kanto speakers in my dining room. They are no-frills and perfect for driving with WiiM streamers. They are compact and stack nicely with other small components like the WiiM Pro and a headphone DAC. The amplifier has plenty of distortion-free power and punch, and will drive speakers very loudly when needed. I really like Fosi audio electronics.