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

Fantastic little box

This tiny amp has blown my mind.The sound quality for the prize is absolutely superb.The available power reserve (I did go for the high spec power supply) is massive 50% volume is more than loud enough 😀Very happy I bought this little beauty.

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.

An amazing amplifier given its size and price point.Properly set up, run in for 24 hours and with a decent Hi-Res Audio signal input, decent cables and suitable speakers and it makes music.The sound is very clean and detailed with no harshness or sibilance. The flat signal response reveals a lot of detail in the music. Not weighted to either end of the frequency range. Very dynamic, good fast attack on solo piano - always a difficult one to project realistically. Not a sound that is aggressive or wearing to listen to.Choosing matching components to provide a balanced system is important, so give it an MP3 input signal you get what you get - medium results, not Hi-Fi.As always one is listening to the system, not individual components. System matching very much matters to the tonal colour especially with cables and speakers. Certainly changing the speakers to +£1000 Spendor, Monitor Audio, Mission etc would unbalance the system and reveal some short-comings - but that would be to use this amplifier far outside its scope of system.One comment I see on several other reviews is the volume control level position ... In my opinion, this knob should be pulled off and set to the 6 o'clock position with the amplifier off (a bit like some older Naim units). Them when the unit is turned on, the volume control rate and progression are correct, in comparison with most expectations with minimum volume around 7 and 10 - 11 being a fair listening level.The 48v PSU now supplied with the unit is capable of providing the dynamic transient peaks without strain, providing adequate reserves and control to avoid 'smearing' of fast pieces and allow quiet passages to feel realistically contrasted with a wide dynamic range.The simplicity of single input and dispensing with tone controls means fewer sound compromises, and gives a superb perfomance far above the expected quality at this price. Enabling you to stop spending more cash on Hi-Fi and spend more on the music itself.Very enjoyable music-making and Very Recommended!

love this, changed out the op amps and it sounds abetter than my £700 rega amp

I neeeded an amp to use for extra speaker sin my system and laso one for dual transducers for bass rumbles. I got 2 Fosi ampsfor each task. Botht he amps have worked well adn are really affordable. The power rating needs a bit of reseach though but I didn't have to be too critcal for the aplications I was using.The sound clarity on the amps are pretty reasonable and give good sound reproduction.I did find that I need to source the larger power packs though to get the most out of these amps adn so eoither buy witht 48 volt pack or factor as a likely extra dependant on your needs.

Tested a lot and still own a few of Chinese class D amps from Nobosound, Fosi Audio, Douk Audio, SMSL, etc. The only one that stays is SMSL SA-50 Plus - perfect for bedroom and has enough power to drive Triangle Borea BR-02 with good low range frequencies. Love SMSL DACs, especially the Sanskrits. Love cheap Chinese valve preamps, but can't say the same about class D amps in a small enclosure. Tested over 20 in the last few years and they all have absolutely same issue - no power in mid-base, lack of sibilance in highs and almost no lower bass. Some will be noisy when idle, others will spark, and some - like this V3 won't have tone controls to try and squeeze out more juice for bigger stand-mounts or floor standers. I own an old made in japan Denon AVR-2805 and it's miles away in sound quality, especially after condensators' refresh, for my three-way 8 inch mid-base stand mounts from AQ. Got Denon AVR-X2000 to power living room Heco's. I tried this V3 in both setups and even though I have valve preamps with tone controls in each setup, the Fosi Audio simply sounded empty and lifeless. I love the chest pounding sounds, if you do too - don't waste your time with the V3. Sorry, I have returned mine together with theirs super-expensive 48V power supply that changed almost nothing. I hope my experience serves well you people who respects what their ears are fed with.