Fosi Audio V3 Stereo Amplifier Home Audio 300 Watts x2 Power TPA3255 Class D Mini Amp 2 Channel Audio Component for Passive Bookshelf Tower Speakers Desktop Home Theater with 32V 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.

I had been hearing about the release of this amp from various forums and decided to experiment with it with a couple of speakers that I have acquired I’ve the last 6 years I or so. I’m a bargain hunter at heart. On one end, I have a pair of Klipsch LaScala’s from the early 1980’s that I resurrected from the dead. They were in horrible shape and came from a church that used them as their auditorium PA. They are know for their efficiency and usually have synergies with tube amps. On the other end, I have the electrostatic Martin Logan ESL’s, which sound completely different, are very detailed and have a reputation of being challenging to drive, although the newer Martin Logan’s don’t have this problem as much. I have been using a 90 watt per channel tube integrated amp and was really looking for an amp that was much cleaner and imparted less distortion, which a tube amp for the most part is built to do. The tube amp sounds great but it seems to blur the sound a bit, if that makes sense. With the LaScala’s, the V3 power was way more needed to drive them. It didn’t sound harsh or brittle and in fact, was completely quiet with the volume knob maxed. My tube amp imparts a slight hiss at the tweeter that is audible from my sitting position. The V3, checked all the boxes and did everything well. The highs and mids were nice and balanced and the biggest difference was with the low end. I have 2 SVS SB1000 subs and the V3 really provided nice and controlled texture to the bass region, something that was lacking in my tube amp. I won’t go as far as using the magical language to describe the sound that many audiophiles use but as this is a subjective review, what I can say is that the amp did its job and at this price, it really is a no-brainer for people that even are wanting to use this will quality speakers. Martin Logan ESL’s Challenge: These speakers are known to have dynamic impedance swings, with ohms that often dip, making them a tough act for many amplifiers. But the Fosi V3 didn’t strain at all. It provided consistent power, ensuring the ESL’s remained articulate and expressive. Much better than my tube integrated. The dips in ohms which could cause some amplifiers to falter, only showcased the stability of the V3. Very surprising for the low cost. Again, what can I say…these small inexpensive amps have improved to the point where they are an incredible value. Conclusion: The Fosi Audio V3 isn’t just a budget amplifier. It’s an amplifier that can be used with expensive speakers. For anyone hesitant to use the Fosi in similar use cases, give it a try. For the price, there’s very little to lose.

I’ve spent some time with the Fosi Audio V3 paired with the 36V stock power supply, and while it’s an impressive performer for the price, it’s clear that this amp is capable of more - and deserves more. Out of the box, the V3 offers solid clarity, good soundstage, and tight control over the low end. It’s a clean, neutral-sounding amp with plenty of detail, and it drives efficient speakers well at moderate volumes. But there’s a noticeable ceiling on dynamics and fullness when using the 36V supply. The sound lacks a bit of headroom and warmth - especially if you’re coming from a more musical amp like a Tripath-based model or something with a bit more current behind it. After hearing what others have experienced with the 48V power supply, I’m convinced that’s the way to go. Users consistently report more impact, better bass, improved dynamics, and a general liveliness that the 36V setup just doesn’t deliver. Yes, the 48V supply costs extra - sometimes as much as the amp itself - but in this case, the upgrade is absolutely worth it if you want the V3 to perform at its full potential. If you’re budget-conscious, the 36V setup still makes a fine minimalist rig for desktops or secondary systems. But if you’re chasing performance and musicality, bite the bullet and get the 48V supply. This little amp punches way above its weight - when you feed it right.

Don't believe the 300 watt claims of the manufacturer. (I don't know why they just don't rate the amp with RMS real world specs). Still the Fosi Audio V3 is an excellent amplifier when paired with the optional 48V power supply, although it increases the cost. With the supplied stock power supply, the amp can deliver about 30 watts of real power and with the 48V power supply it can deliver about 80 watts of unadulterated bliss. The sound is clean with absolutely no hiss. You can tailor the sound by easily replacing the socketed OpAmps inside the amp, just make sure you insert them with the proper polarity. OpAmps can range from several to over a hundred dollars for a set. Better OpAMps can give you better depth and a wider sound stage as well as a mellower sound. Remember this is a no frills amplifier with only pair of inputs, it is basically a volume knob and nothing else. But this is perfect when used as a desktop amplifier to drive a pair of desktop speakers. In this mode of operation, you do not need the optional power supply since most desktop speakers are quite efficient and do not need much power. The 48V provides a more heft to the sound with the added power. It can easily deliver enough power to drive most speakers. With either power supply, the amp seems capable of driving even 4-ohm loads without distortion which most modern amps fail to do. Some Pros: * Cheap but great value * Compact size * Very efficient * Swappable OpAmps * High quality components: Elna capacitors, WIMA Output capacitors, Sumida inductors and NCC Capacitors Some cons: * Fosi used to supply the amp with the copper volume knob as well as the black one but it is now an added option. * The amp goes to sleep rather quickly after the input signal is cut. It takes about six seconds for it to come alive when signal is restored. * There is only one pair of RCA inputs * No Bluetooth capability * No subwoofer output

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.

I've been using this amp for a little over a month with my desktop PC and audio interface. Sounds good and clean. Simple, small, and nicely built. Plenty of power with the included PSU. It's powering a pair of old Klipsch KG .5's (50 watts RMS, 90 dB sensitivity, 60Hz-20kHz). I usually keep the volume around 10 or 11 o'clock at most, which is plenty loud in my small room. Don't think I've ever turned it past halfway. That leaves plenty of headroom in my case. I tested the noise floor by turning the volume to max while nothing was playing and heard absolutely zero hiss. Very impressive. My only complaints are the lack of a true sub pre-out and the light thumping noise it makes when turned on. Otherwise this is an awesome amp and I'm impressed with how far Class D has come. It's a killer deal for the price.

If you pair this amp (which is the size of your palm) with a Chromecast Audio, (not even the size of a sand dollar) and then, oh, say, an old, much-loved pair of NHT Super Zeroes... ...you're going to be very, very happy for the following reasons: It's three components with clean sound. They're so tiny and easy to hook up, they're beach-week portable. None of them look portable. They don't ruin the room. A guest might not notice them until they're played. The sound for the cost is absurd. A renewed Chromecast Audio is currently 45, the Fosi V3 is 80, and Those Speakers You Still Have are sitting unused. It's great for podcasts. Not good. Great. It's a small room joy for music. Any kind, I'm not kidding. And you're only using this in a small room. A sideboard in a bedroom. That kind of thing. Because you're not caught up with What Else Can It Do. Which is the root of all unhappiness. Those two previous items are important, because it means YOU DON'T HAVE TO UPGRADE THE POWER SUPPLY, or pretend this is 300 watts a channel, or watch a Dune-length video insisting it's only 50 watts per channel, therefore... No. Stop. It gets Divorce Loud with what comes standard. While sounding clean. If it doesn't sound clean, that's your speakers, not this amp. Get something small and sleek and cheap from Q Acoustics, Jamo, Kanto, Micca, or NHT. Because you want to be happy, right? Buy this amp.

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!