I’ve been eager to add external amplifiers to my home theater setup for quite some time, but nothing on the market quite caught my attention until I discovered the Fosi V3 Mono. Sure, there are plenty of amplifiers on the market but very few when it comes to the power, quality, features, value and reputation of a company that stands behind their products like this one. The V3 Mono checks off all these boxes for me in stellar fashion.
- Power – The power output of these compact amplifiers is impressive. Their ability to handle speakers down to 4 ohms, effectively doubling the output from 8 ohms, showcases excellent amplifier design (after reading the manual, I saw they are actually 2 ohm stable!). This feature is exactly what I needed to drive my power-hungry 4-ohm speakers (like the one pictured). The extremely low distortion at rated power also allows these amps to push my speakers at any volume I am comfortable listening to with no unwanted noise.
- Quality – The V3 Mono has a solid, compact chassis that feels durable. The switches have a satisfying, firm click, making it easy to feel confident about mode selection. The connections on the back offer several options including fully balanced, another sign of the quality and intended use of these amps. The speaker posts are on the small side, but that is understandable considering how small the amp is overall. While the posts are fully functional, they are best suited for banana plugs and that is perfectly fine for me since that is my preferred method to connect speakers anyways.
- Features – Since I wanted external amps to use with my AVR, I didn’t need any additional processing, volume controls or anything other than simply amplifying the signals to my speakers without any additional steps for me each time I want to listen. Before the V3 Mono, most Fosi options included volume or tone controls, and many required a separate power switch, meaning I would have to turn each amp on and off manually. The auto sensing on/off feature on the V3 Mono works perfectly and along with no volume or tone controls is exactly what I wanted so my AVR can handle all the processing and automations. Having RCA and XLR/1/4” connections are really important to me since my AVR only has RCA but I want the flexibility when I eventually upgrade to a standalone processor. While not needed in my case, the gain control is another good addition to ensure more compatibility without overloading the unit with unnecessary features. The elegant design includes a small, unobtrusive power indicator and contrasting side vents that give my system a unique look when I set them up sideways on either side of my AVR (pictured) and allows me to use shorter cables.
- Value – I’ve been evaluating audio components most my life and although I’ve wanted amplifiers like the V3 Mono for a long time, everything else I’ve noticed that are comparable to me have been around 10 times the cost. Not much more to say about value other than these amplifiers should be an easy choice for anyone with similar requirements.
- Reputation – I never heard of Fosi until a few years ago when I was looking for a solution to add quality sound to my bedroom. I wanted to be able to connect to my TV since I’ve never been able to settle for built in TV speakers and I also wanted to modernize with the ability to stream my local music library or from other online services. The most obvious options were either very expensive music streaming amplifiers or smart speakers but neither seemed to be good values or fit to me. Then I came across the Fosi T20 and it intrigued me, but I was unsure of the quality. After doing some research and reading a lot of reviews, I learned that Fosi was a new brand that was serious about delivering quality sound to audiophiles at a reasonable price. I was still a bit skeptical but decided to try out the T20 since it seemed like the perfect fit for what I was looking for. I was immediately blown away after I set it up with various extra speakers that I had around and all of them sounded better than they ever did with this tiny and very inexpensive amp! This made me a Fosi believer ever since and I really like how they seem to be taking feedback directly from the audiophile community to develop products that we want and need. I’ve been patiently watching Fosi releases since the next sound project I planned would be to lighten the load off my living room AVR and upgrade the amplification to my home theater. When I saw the V3 Mono announced, it was a no-brainer to add these to my system.
Listening impressions:
To establish a baseline, I initially compared the V3 Monos to the T20 model I previously mentioned. Using a Fosi LC30 meter/switcher, I could seamlessly toggle between the T20 and V3s across two speaker sets. I was surprised and somewhat disappointed during this comparison because I was expecting the newer, more powerful V3s to outperform the T20 but what I discovered was to my ears, they sounded nearly identical to each other. I had someone else listening with me who did not know what amps or speakers were playing at any time. I just asked them to describe the sound each time I switched anything. According to their descriptions, I noted there were differences that made each combination sound better for different content. Overall, the T20 seemed to produce a more live sound that paired well with a variety of vocals and the V3 seemed more transparent, which paired better with instrumentals and possibly with more finely recorded material. In the end, this comparison was not so much a disappointment for the V3 Mono, it was more of a testament of how good the T20 also is and demonstrated the consistency of Fosi products to me.
The next test was using the V3 Monos to replace some of the internal amps of my AVR in the living room. The living room is much larger, with high ceilings and more room for error so I’ve been hoping to add any advantage I can to help improve the sound there. This was precisely why I purchased the V3s, so I was eager to see if they’d provide the sound quality boost I hoped for. We first listened to the AVR using the same tracks as we used in the earlier test to get a better sense of how it sounded on its own in various modes. It was tested in stereo mode, pure direct stereo and surround mode (Dolby & DTS interpreted from stereo music feeds). My complaint with the AVR, which was apparent in these tests to the other person as well was the sounds are muddy with less separation and definition to the vocals and instruments. We also listened to a movie using Dolby Digital because another issue is we often have trouble hearing dialogue through the center channel as clearly as we would like.
The first test here was to replace the front left and right channels of the AVR using the preouts to the two V3 Mono amps. In stereo mode, the immediate impression from both of us was the sound livened up and separated significantly and I also noticed more defined punch in the bass and mid-bass in the frequency range above the subwoofer that the V3 Mono driven fronts were handling. Off to a good start, the next test was to use just one V3 Mono to run the center channel. We noticed the same thing where the center channel came to life with increased clarity and a more effortless delivery. Taking the heavier load of the 4 ohm center speaker off the AVR also seemed to help it drive the other speakers better although the fronts still could not deliver the same bass I noted when they were connected to the V3s. So far, this configuration produced the best overall sound from the home theater setup and while it gave no improvement to stereo listening, our main purpose here is to consume content using surround modes. Finally, since my speakers have two sets of binding posts for bi-amping and I have the extra V3 to spare, I split the center signal and ran both amps to the center speaker to give that a try. Not as much of a difference in this configuration if any from just using the single V3 but the extra headroom made vocals, sound effects and dialogue the most defined that we’ve ever heard from this center speaker so until I can get a third V3 Mono to cover the three front (LCR) channels, I’ll most likely leave it as is.
Conclusion:
Overall, the Fosi V3 Mono is an outstanding amplifier that performs beyond what one might expect given its size and price. It’s incredible how far technology has gone to make something like these amps possible. I think the V3 Mono is the perfect amplifier for my application and I highly recommend it for any system where you have existing control processors and just need pure, transparent amplification if it meets your output requirements (it has plenty of power that should satisfy most). I look forward to future product from Fosi like the V3 Mono in a stereo or multi-channel version to use for surround channels or specialized for fully active setups.
