Excellent amp. I measured 100 watts RMS at 4 ohms and 55 watts at 8 ohms using the 32 volt 5 amp supply. Very impressive for something so small. No detectable noise and absolutely no turn on or turn off "thumps". Great product for the price. I'm using it for my TV sound and with a normally efficiency speaker (86 db @ 1 watt) it can shake my room with explosions during a movie.

I'm an aging baby boomer who has been exposed to a bit too much boom, and the frequencies above that, over the years, when mixing sound and testing loudspeaker systems. I bought this little amp to sit beside my chair, where I sit to watch TV, movies, etc. I have an excellent audio for video system, but the levels at which I like to listen are not conducive to great relations with others in the house, especially if they are trying to sleep.I took a stereo feed off the receiver and pumped that into the RCA terminals on this little Fosi Audio amp. The amplifier's output goes to a pair of mini speakers, with one positioned to each side of my chair. So regardless of the surround system's level setting, I can independently deliver L and R audio to speakers that are so close that just a little level from them is adequate.So, I'm not pushing the amp at all, and can't attest to it's power capabilities, but I can say that it sounds clean, offers useful bass and treble controls and the overall construction is excellent.

Zuiver en een realistische weergave van stem en instrumenten, MITS je 24V voeding gebruikt.

Uno degli amplificatori più potenti prodotti da fosi audio, magari un po' datato, ma perfetto.Comanda le lonpoo lp42 in modo egregio

Grata sorpresa que me dió este pequeño amplificador... al menos con mis Polk Audio monitor 60 suena muy bien, compré primero el Sony str dh190 que tenía buenas opiniones pero ese sonaba hueco en los graves cómo sin cuerpo y muy chillón en los agudos aunque tenía buenos medios pero este Fosi lo hace todo bien, me tomó vários días acostumbrarme a el pero cada vez me agrada más, incluso en canciones que he escuchado mil veces antes por años ahora que las escucho por primera vez con el salen de repente sonidos que no había notado y me dejó sorprendido la potencia que tiene siendo tan pequeño en tamaño, en fin por el precio me pareció excelente.

I used this Fosi Audio TB10D TPA3255 600W Power Amplifier to connect a TV to old 100W Jensen Hi-Fi passive speakers. The sound that this little amp put out was so clean and high quality that I was blown away! With the volume at 10 O'Clock on this amp, the sound was plenty to fill a large sized room with crystal clear clarity of voice output from the speakers. Of course the Jensen speaker is a good one but this amp put out a real good sound. The TV was connected to a mini DAC via optical cable. I bought this DAC from Amazon too and works just fine for PCM audio. The DAC was connected to this Amp with RCA cables. Hey presto, great quality sound. Don't go past this little amp for home spaces .. sounds absolutely great!

This little amp drives my 3-way speakers very nicely. Nice clean sound and bass. It's small and compact and will save you space on your shelf, desk etc. Good price too. My nitpicking downsides is that the power supply is fairly large, about half the size of the amp itself so it might not save you that much space depending where you want to put it. Also, if you want to use the full power of the amp you need a better power supply which I'm not sure where you would purchase one from. A quick look at Fosi's site found that they do not sell it but the power supply included should suit most people. The on/off switch is retro which is cool but it looks fragile and if it breaks then you're stuck unless it breaks on the on position. I do like the simplicity of it. No built in radio, remote control or bluetooth which is fine by me. No headphone socket but that's okay too as I have one on my sound mixer. Overall, I really like this amp and hope it lasts a long while!

As a matter of background info, when these inexpensive Chinese-made Class D amps first started appearing, their sound characteristics were almost universally described as being thin, cold (in many cases, harsh in the upper frequencies), and fatiguing for long-term listening. But at the time, they were what they were, and they were selling like hot cakes due to their ridiculously low prices.As time went on, individual brands started producing models that slowly began improving - meaning, warmer with a fuller sound signature. Yet in the end, these models were still lacking in a number of areas.Fast-forward to now. We now have a wealth of updated class D models (most under $100 USD) that have begun to turn heads in a most positive way. The inexpensive class D sound has gradually experienced a metamorphosis - that is, audio reproduction now began to gradually take on a warmer overall tonality with a better overall balance. In addition, some of the newer releases began incorporating welcomed additions such as having removable/changeable Op-Amps - thus allowing the end users to improve the sound to their liking. Upgrading these Op-Amps, in particular, to the discrete, more expensive types (made by MUSES, Sparkos Labs, Burson, etc.), result in significant improvements to audio reproduction. Some of FOSI Audio's later releases such as the BT20A Pro and the wonderful V3, all feature removable/interchangeable Op-Amp capabilities and if you replaced the typical stock NE5532 Op-Amps with either the likes of the MUSES02, BURSON V5i or the Sparkos Labs SS3602 discrete versions, the sound qualities of those amps were advanced substantially.I've owned/used 20 different Asian-made Class D amp over the past years, and when I received this new updated version of the Fosi Audio TB10D, I immediately discovered that it has a sound signature similar to many of the models out there with the Texas Instruments TPA3255 amplifier chip - that is dynamic and a bit warmer and fuller. Like select models using this TPA3255 chip, the user has the ability to use power supplies ranging from 24-48V varieties and the higher you go, the more wattage the amp is capable of putting out.With this Fosi TB10D, I was stunned at how small it is. It is roughly 3/4 to 2/3 the size of the smallish Aiyima A07 (both can use 48V power supplies if needed). The Fosi is very well constructed and has a very solid feel, along with the knobs (not plasticky) - giving it a quality level feel that belies it's inexpensive price. The on/off switch in the front is very solid and convenient, to be sure. Now keep in mind that the TB10D does not have BT capabilities - it’s just a basic amp.As an aside, rather than use the supplied external power brick (32V), I had several high-quality linear power supplies on hand, which I could set to whatever voltage I wanted, up to 40V max. I set one of them to 40V and attached the Fosi TB10D. I then turned on the Fosi and let it warm up for 8 hours before I began listening. Having been an audiophile for well over 55 years now, I'm a firm believer in giving various audio components an initial time period to warm-up/break-in before doing any listening, because for most, sound qualities improve with a good warm-up/break-in period. As an aside, regardless of how long you have the TB10D powered on (I keep my gear on all the time), its case stays cool to the touch.I then connected the TB10D using 10 gauge professional cable (Blue Jeans Cables) terminated on the ends with banana connectors, to the KEF Q150 and Q350 speakers (alternating between the two). The TB10D was fed by a variety of DAC units using a custom-made 8-way in (1 out) RCA switcher custom-built by Maple Tree Audio Design from Canada. This enabled me to use a variety of attached DAC/Head-amp units to determine sound variations with the amp.OK - so let's discuss the audio reproduction characteristics of the TB10D:1. Overall sound signature: Initially - like most other inexpensive class D amps - the sound is a bit thinner, slightly warm, but lacking in feel for that "you are there," immersive experience. As time went on, the overall sound signature warmed up a bit more, became fuller, and had a nice, overall feel to the music. In other words, it is a very "nice" sounding amp to be sure - especially for its ridiculously low price. However, does the term "nice sounding" imply that it is a highly immersive, musical, and accurate sounding amp? Well, no...please read on.2. Sound-staging is wider than some amplifiers, but not in the best category. But given its price-point the sound-staging does not disappoint, considering it's low price.3. Bass capabilities: Very dynamic and fully present (when it's in the recording). In fact, on some recordings, I had to back off on my power subwoofer to balance things out. So for bass heads - once the amp is warmed up - you won't be lacking in the bass department. Does the bass have air and separation like better class AB amps - well, no it doesn't. But there is plenty of bass to go around.4. Midrange and Treble capabilities: Very nice and smooth, however, like all class D amps have a tendency to do at times (but becoming rarer with each new release), some instruments may still come through with a slight "steely" quality to them, like stringed instruments in a large symphony orchestra. However, the TB10D does a much better job than most in this department.5. Depth and air around the instruments: The TB10D does an average job here - nothing exceptional, yet good enough. However, for class D amps in general, this particular intangible quality is often elusive.Audiophile Qualities: For informational purposes, there are some intangible characteristics of "better" amps (i.e. class AB and class A versions) that can best be described as having qualities which cannot be measured in the traditional sense, yet can be experinced when they are present. These intangible qualities include variables such as: a. Being able to accurately convey the ambience of the performing venue. b. Being able to showcase the depth and air around various instruments. c. Being highly immersive - that is, the last veils (regardless of how slight they may be) have been removed between the listener and the music. d. Having correct instrumental timbre - that is, each instrument's tonal qualities are accurately showcased, often-times also referred to as “being musical.”Now, remember - I said that the TB10D is a very good-sounding amp (like many other contemporary models on the market today). However, "Good" does not necessarily translate into being immersive or highly accurate. I say this because overall - again, like many other class D amps - there is a slight (warmish) veil/tonality (in particular with the myriad of instruments in a symphony orchestra) that detracts from the feeling of "being there." This is to be expected really, because after all, this TB10D only costs around $60 to $79 (depending on where you purchase it from). Now if they gave this amp the capabilities like some other Asian made class D amps have - that is, being able to remove and change out the Op-Amps, then that could change the game significantly. But it is not to be - everything is permanently attached inside the Fosi TB10D. The only thing you can upgrade with this TB10D are the power supplies (and the types used).Now here's an important aside - Fosi Audio recently released their much anticipated upgraded BT20A Pro, which is only a few dollars more, and just a few short months later, the highly reviewed and highly regarded FOSI Audio V3 (and by many audiophiles, no less).The difference here also (and it's major) is that there are now 2 dual channel Op-Amps inside both the BT20A and V3 that you can remove and upgrade! This will improve the sound substantially and bring it more in line with what you would hear with class AB amps.Getting back to the TB10D, based on its low price and what you get, I am giving this Fosi TB10D class D amplifiers a 4-star rating - had it the ability to change Op-Amps (thus improving the sound for the most part), I would have given it 5 stars. However, for its very low price, the TB10D punches far above its weight. It is a pleasant amp to listen to and its small size belies the power you get, and it can drive many a speaker - large or small. As I alluded to above, I do strongly suggest that folks invest in "linear" power supplies that make a huge difference with all of your audio components (those components with external power supply bricks). With a linear power supply, there are no hums or other noises. All you get is pure, quiet power that contributes significantly to your audio output. I have several of these with different voltages (link below) that I use, and I also have one that was custom-made to allow up to 40 volts. With this version you can power two devices on the back (not just one), so if you have two devices using the same power, this one linear power supply can power both of them, and it shows you the voltage on the front LCD screen.https://www.amazon.com/gp/product/B09SVK9CQF/ref=ox_sc_saved_title_4?smid=A39KK3JMT5S2I5&psc=1So folks, if you are on a very, very limited budget, you can't go wrong with this Fosi TB10D class D amp. It's price, build-quality and musical pluses - all combine to make it a pleasant experience. However, now that the FOSI Audio BT20 Pro and V3 were released - all with improved internal components and interchangeable Op-Amps, I'd have to give them a much higher recommendation over the TB10D - just sayin.'Now, I realize that all reviews are subjective, and that no two people may agree. Your mileage may vary.

I bought this after listening to the review by Randy of the CheapAudioMan Youtube channel. He spoke highly of this amp, and I found his conclusions to be accurate.I bought this to use in my garage. I wanted a simple amp that didn't take up much space. In my garage, it's gonna get dusty...and it's going to have to compete with power tools, air filter, etc. That's not the place for mult-thousand dollar amps!!About the rated power...you have to be realistic. I know this amp says it's 600W, but it's not. Not in any practical sense, anyway. And none of the other cheap class D amps are going to be, either. The difference is that more expensive amps stay clean at or near their rated power. These cheap amps don't. They start to introduce distortion well before they get to their max power...That's not to say it's not a stout little amp...it is! But you can't compare this to a $2K+ amplifier with a rated output of a couple hundred wats, and think they're going to be equivalent! To put it in terms most folks can relate to, I'd say this amp will drive speakers to about the same level as a typical mid-level class AB receiver in the 50-70 watts per channel range. Beyond those levels, you start getting distortion that you can hear, and that can damage speakers. But that's shouldn't really discourage you...with moderately sensitive speakers, 50-70 watts is pretty darn loud!In my case, I used this amp to drive a pair of Klipsch KG2.2 speakers that I bought a while back on Ebay. KG 2.2 speakers have a sensitivity of 93db. That's a little bit higher than average, and this amp drives those speakers to very high volumes! If your speakers are less sensitive, the volume will be lower, which is the case no matter what amplifier you're using! If you're using this amp in a bedroom or small office, it's probably gonna be loud enough with any speakers you have. But if you're driving 87db speakers in an 800 square foot room, it's probably not going to get very loud. If you like to shake the walls and anger your neighbors, keep that in mind.One of the categories mentioned above is volume control, so I'll mention it. On this amp are three controls...volume, bass and treble. They all work great. Smooth controls, no static, and the tone controls add just the right amount of cut or boost to the bass and treble respectively. In my case, I set the tone controls the way I wanted them, and I put the volume control to about 75-80%, and I just leave the amp on 24/7. In normal use, I connect to the WIIM mini streamer using the app on my phone, and I control the volume that way. This works great, and gives me remote control over the volume.For the price, this thing is a steal! In fact, I'm going to buy another one, which I plan to use to power the outdoor speakers on my patio. Currently they're being driven by a very cheap JVC receiver left behind by the previous owners of my home, and I am confident this amp will do a better job than the JVC is currently doing!