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
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Sep 10 – Sep 11
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Model: V3_32V/5A
Features
- Compact Yet Powerful: The V3 mini power amplifier combines a minimalist design with exceptional performance. With a power output of up to 600W, it can effortlessly drive 2-8 speakers, delivering impressive sound quality. Its compact size makes it suitable for various applications, from bookshelves and desktop setups to home theaters
- Audiophile-Grade Components: It features the TPA3255 high-end digital class D amp chip and utilizes premium Japanese NCC, ELNA, and German WIMA capacitors, and Japanese Sumida inductors for exceptional audio quality. With a SINAD rating of up to 88dB, an SNR of up to 110dB, and a low noise floor of only 140uV, it delivers exceptional clarity and low distortion
- Scalable and Fun: Tailor your sound experience by swapping the stock NE5532 op-amps. V3 is compatible with a variety of 8-pin dual op-amps like Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4559, LM4562, LME49720HA, etc. When replacing the op-amp, please make sure the chip is oriented correctly and the procedure is done accurately
- Enhanced Pre-out Functionality: The V3 features an optimized "Pre-out" design. The level is now controlled by the volume control, allowing for adjustable sound levels when connected to the "Pre-out." This enhancement offers greater flexibility and convenience for users who prefer to fine-tune their audio experience
Description
Integrated quality components and groundbreaking heat dissipation design enable high and stable performance catering to audiophiles' demand. Using a minimalist design language, focusing more on enhancing the sound quality and performance of the product, making it the best-sounding power amplifier of Fosi Audio to date. Enabling superior audio quality & ultra-low distortion across the audio band with Class-D efficiency Compatible with 8-pin dual op-amps. Roll them to get your preferred sound signature Built-in quality Japanese NCC, ELNA, and German WIMA capacitors for outstanding performance Professional audio inductors which have lower impedance and enables support for larger currents Manage the volume of sound in a much finer way suitable for the human ear Vents on the top and bottom, and whole-body heatsink design enhance air circulation and cooling the V3 amplifier delivers a cleaner sound, preserving the original audio characteristics. The "Pre-out" level is NOT controlled by the volume control. V3 V3 Mono ZA3 TB10D BT20A Pro BT30D Pro TP-02 Amplifying Your Voice, Shaping Our Innovation Guided by our mission of "Redefining HiFi with Unmatched Value", Fosi Audio continues to fuel its passion for the Hifi industry, ramp up R&D efforts, and co-create new HiFi equipment with users. We pledge to bring more amazing Hifi gear with high value for the price, innovative design, cutting-edge technology, and premium quality, to audiophiles worldwide.
Manufacturer: Fosi Audio
Brand: Fosi Audio
Number of Items: 1
Built-In Media: Power Supply
Item Weight: 1150 g
Model Number: V3_32V/5A
Mfr Part Number: V3
Unit Count: 1 Count
Warranty Description: 24 Month Manufacturer
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sep 10 – Sep 11
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Model: V3_32V/5A
Overall Rating: 5/5 (4.5/5 but I had to round up) TLDR: If you want an stero amp that is a fantastic bang for your buck, this is the one. Only buy the 48v one if you're using it in a large room or with beefy speakers. Use: Desktop Nearfeild listening through a pair of JBL Studio Series S36ii Monitors Audio signal is fed from my 2025 MacBook Pro (Spotify & Tidal) Generic 16 gauge bonded wire (not specificaly speaker wire but same resistance) & Ugreen 3.5mm to RCA cable 32v 5A power supply (the smaller one) I've put this amp through my ususal tests with some songs I know very well (Teddy Killerz, KNOWER, Muse, Pendulum, Etc.) and it sounds very nice. It is a Class D amp so its lacking with the reproduction of ceritan sounds and the realy low frequencies but I have a sub hooked up to the pre-out now so my setup is full range now though it was very good even without a sub (mostly due to the S36ii's larger drivers). It's hard to go wrong with an amp like this. It's decently priced, Fosi is pretty reliable as a company, and it just works. One of my only gripes is the volume knob also being the power swich (turn the knob passed zero to turn off the amp), I would rather have a swich on the front so I can keep my volume setting the same. This is not a dealbreaker or a problem though as I will not be turning the amp off and on much. This is a Class D amp so its not true "audiophile grade" but if you don't have a whole room and multi thousand dollar setup for listening then I think you'll find this amp to be plenty good enough. If your use case is hole theater this is very good, the added power and compact size makes it great for larger rooms with wall mounted TVs. Not suitable for sourund though. There is a slight bit of hiss or static when adjusting the volume while no sound is being played, but it is not noticable while playing sound. I keep my MacBook's volume at 50% and use the knob to adjust the volume, I find that the knob between 10 and 2 o'clock si perfect. * If you have very small speakers or ones that are very easy to drive, do be careful not to pop them. This is a 300 watt amp (per channel). This amp would blow my S36iis at max power, so be cautious. Great amp, would buy again. - Darwin
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Reviewed in the United States on April 23, 2026 by Darwin
Model: V3_32V/5A
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.
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Reviewed in the United States on July 26, 2023 by David P. Vivar
Model: V3_32V/5A
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
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Reviewed in the United States on March 16, 2024 by Jon96789
Model: V3_32V/5A
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.
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Reviewed in the United States on August 27, 2025 by Boring Bob
Model: V3_32V/5A
I don’t know if burning the V3 in would change my perception but I used more than 72 hours. This amp has the precision to make a great home studio monitor amp. Plenty of detail but lacking in warmth or low end. A subwoofer would be mandatory. I’m comparing this to a goodwill find Denon DRA 397. The clarity is similar with the Fosi punching harder in high mids and although having stellar detail it doesn’t have a warm smooth side. With the supplied 32V power supply it doesn’t get even close as loud as the Denon. It’s loud but only with knob all the way up. I see this as an amp useful for my small home studio projects, but not the most pleasing choice for day to day enjoyment. Update: I’m now using this in a bi-amp situation to power my Paradigm Titanium tweeters and an Emotiva A2 mini to power my Heco woofers. After upgrading the Fosi with Sparkos op-amps the high end is STUNNING. Silky smooth highs with all the transparency and air these tweeters could ever produce. Blended with the other amp and woofers I’m getting results that blow away anything in the price range of what I spent, or have ever spent. I’ve used everything from vintage Kenwood to a ‘90s Music Hall amp. (I suppose the MH could outclass the Emotiva technically, but I’m not hearing it). This combination is simply amazing. If you’re only using the Fosi I highly recommend you upgrade to the Sparkos op-amps. That’s my ears talking, not relying on some bench test graphs that might imply they don’t change anything. They might not change output measurements but they sure change the quality of what you hear. That’s my 5 decades of listening speaking, including 4 in music production.
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Reviewed in the United States on September 30, 2023 by Brad Rapp
Model: V3_32V/5A
AWESOME PRODUCT, GOOD SOUND AND GREAT VOLUME, YOU WON'T REGRET IT.
Reviewed in the United States on July 27, 2026 by Fernando Inq
Model: V3_32V/5A
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.
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Reviewed in the United States on November 19, 2023 by Matt
Model: V3_32V/5A
I was in the pro audio industry for 40 years and since I retired have built a quite few DIY preamps, amplifiers and headphone amps, my favorites being mostly Pass Labs circuit designs gifted to the DIY community. I got the Fosi V3 after reading about it on the Audio Science Review Forum. I know from experience that a clean design can reveal subtle differences in opamps at the front end, so the socketed ICs really appealed to me. Out of the box this amp sounded pretty good, perhaps a bit "hard" but still quite acceptable with nothing exaggerated. I've participated in some opamp "shootouts" and evaluated well over a dozen different opamps in both the Pass M2X amp and the Colburn Whammy headphone amp. So when I swapped out the stock NE5532P opamps for some OPA1612A devices (my favorite opamp) I got a big smile of satisfaction. Smooth and musical. Pretty good for class D! The swap out is not totally intuitive. Remove the rear and bottom screws and the amp card will slide out just enough to access the IC sockets. Unfortunately the sockets are very tight, requiring a lot of careful and gentle rocking and tugging on the original chips to work them free. There are some extraction tools available but I didn't have one. Maybe Fosi, if you are reading this, could include one as a bonus in the future. One drawback to the OPA1612A is that it is only available in the SOIC SMD package. So it requires being soldered to a SOIC to DIP adapter board. A fine tip, temp controlled solder station and optical magnifier are pretty much necessities. There are caps crowding the IC sockets so either adapters with the same footprint as the socket or a larger adapter stacked on an empty socket to get it just above the caps is required. I went the later route. There are plenty of 8 pin DIP ICs, not requiring adapters, that sound good to my ears and might outperform the NE5532P. The RC4580 is a bipolar input opamp that has a following, along with the LM833N which has its fans. You could try the OPA1656ID or the OPA2134PA, both very good FET input opamps. Unfortunately there isn't any room in the chassis for a discreet opamp like the Burson V6 Classic but then you would be installing an opamp that costs almost as much as the V3 amplifier itself.
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Reviewed in the United States on July 23, 2023 by Desert Rat