BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers

A nice little amp.Power consumption:With the supplied 32V 5A power supply, the unit consumes 1.7W while waiting for a signal and 3.7W when either bluetooth or RCA inputs are active. In normal use amp only pull about 3.7-4.0W - this is a big improvement over lots of my classic, older stereo gear that idles at 10-30W. It means I can leave it on 24/7 without worrying about the electricity bill and extra heat generated.I tried the 48V 5A power supply, and it seemed like it did make the sound a little tighter, especially in the bass. But, I did not control for volume so it's possible it was just louder. With the 48V supply, the unit draws 3W when waiting for signal and 7.8W with the output amplifiers on. With the 7.8W of idle consumption, the unit gets quite warm to the touch, and the consumption starts to approach more-featured receivers. I swapped back to the 32V power supply as I intend to run this near-24/7 so energy costs are important.Bluetooth sounds good and is my main use case for this system, but I'm not that picky. I haven't done super critical nearfield testing, but it sounds great filling a large room with a pair of old floorstanders.The two-band EQ is very useful, and is largely why I picked this particular amp. With my big old speakers it works great to tame the rumble a bit and add some sparkle back in. It's kind of annoying that the Treble knob is to the left of the Bass knob, which is backwards from basically every single other amp out there. That's only noticeable from up close though.Power and Gain:The amp's power is good. If you feed it a powerful signal the amp will give you more than enough volume. Bluetooth signal level is high and the RCA input is fine for anything modern that's mixed loud. I only checked for a few seconds but this amp gets way louder than I would ever need.The gain is just OK. I think it's pretty standard as far as amps go. It's still a little bit disappointing because it's hard to get a program with low signal level loud enough. It would be nice if there was a little more gain on tap or a low gain/ high gain switch. I'm debating getting a preamp to put in front of it.Overall I think it works great, looks great, and it's been powered on playing music pretty much 24/7 since I got it

I bought this amplifier to pair with my Sonos Port so I could use a set of Yamaha outdoor speakers, and it's been exactly what I was looking for. Setup was quick, and everything worked perfectly right out of the box.The sound is clean, powerful, and distortion-free, even when turning up the volume outdoors. I also like the compact design, it looks modern and doesn't take up much space in my media cabinet.I've had zero issues with it since installing it. If you're looking for an affordable amplifier to add passive speakers to a Sonos setup, I highly recommend this one.

I admit that I have little knowledge of audioAnd electronics.I thought 300 watts of audio power had to come from a big heavy expensive amp. My new house came with 8 ceiling speakers . I had no idea whether they worked or sounded decent. The previous owner left an AVX speaker selector next to a bunch of speaker wires that were coming out of a wall port.I called Cambridge Audio and an advisor told me I would need to buy an amp costing at least $600 to run the speakers. Since I had no idea how it would sound , i looked on Amazon for an alternative. I took a chance on this tiny inexpensive Fosi amp to see if the setup even worked.It turns out that 3 of the 4 zones work and each sounds great using my phones Bluetooth and Apple Music through the Fosi into the speaker selector . I am being cautious with this setup , but I have determined that I can definitely power three zones simultaneously at rockin’ volume. The bass is not earth shaking , but is ok.I am amazed at the sound . Since the speaker selector has an impedance protector switch, I am relatively certain that I will be able to run 3 zones simultaneously without blowing out the speakers.I think the Fosi Amp is great . I am not audiophile and have reasonable expectations. The amp has an 18 month warranty. It is tiny and the Bluetooth is so strong that I do not have to leave my phone next to the amp.I highly recommend this tiny Bluetooth amp.

Years ago I purchased another FOSI amplifier. A fifty watt per channel one. Back then, even before I really knew much about class D amps, I thought it was an amazing little product. I am still using my original FOSI amp at a different location, and it has provided flawless service. Obviously now a fan of many Youtube audio channels, this BT20A Pro gets many accolades . With confidence I bought this one. I am using it in my garage, with ELAC OD-M81 speakers , and WiiM mini and now a SMSL D1 DAC. I am unbelievably happy with this system. I am running the tone controls flat, but did try them and they are not obnoxious is their adjustment. I like the metal case. The back speaker terminals are adequate if smaller, but no issues at this price point. I bought the one with the 32 volt power supply, and that is fine for my application, but am considering the 48 volt, just for the fun of it. And that last statement is key. This is fun!It's a solid little amplifier doing exactly what it is designed to do. Sound good, producing a balanced frequency signal and revealing the music as it was intended. As always, what you put in you get out. Older poor recordings will still be poor, but modern good recordings are excellent. This amplifier can be a part of an affordable, but excellent music system.

Don’t be fooled by the size of this little giant. This unit packs a good punch despite its size. I paired it with a pair of Polk Audio Atrium 5 Outdoor Speakers, and it does a great job. There’s one extra feature that I love about this unit, which is the capability to connect to the audio system through Bluetooth. In my case I paired it with the Bluetooth of my TV and from it I can control the volume to the Fosi Amp. I am highly pleased with this little giant.

I bought this little gray superhero after my previous “mystery box” amplifier (buried deep inside my outdoor BBQ island like some kind of archaeological artifact) decided to cut in and out every time I turned the music up past “mellow backyard vibes.” Nothing kills a good afternoon faster than your speakers crackling like they’re coughing up dust.📦 First ImpressionsThis thing is tiny. Like “did they ship me the right item?” tiny.But don’t let the size fool you — it punches like a heavyweight. Bluetooth range? Strong. Power? More than enough to drive the 6.5” Aquatic AV outdoor speakers I already had wired in.🔧 Installation (AKA: How I Crawled Into My BBQ Island and Survived)My previous setup looked like NASA mission control. Wires, harnesses, proprietary connectors, and something pretending to be a subwoofer box.The Fosi made the whole thing simple:• Speaker wire → into left & right terminals• Power adapter → plug• Bluetooth → connect• Music → immediate happinessNo proprietary weirdness. No random 4-pin blue plug. No tears.🎵 Sound QualityCompared to my old Aquatic AV amp, which acted like it had seasonal allergies, the BT20A Pro is clean, strong, and shockingly loud for its size.• Bass is smooth (especially with your speakers’ built-in low-end)• Highs are crisp• Mids are clean• And the bass/treble knobs actually do something instead of just pretendingHonestly, for a backyard setup that sits in a protected cabinet, this little thing is the perfect “sweet spot.”📡 BluetoothFast pairing. Zero drama.I walked almost to the front yard before it even hinted at disconnecting — which, for anyone with an outdoor entertainment setup, is basically sorcery.🔥 The VerdictIf you want:✔ A simple, clean replacement for a dead factory amp✔ Power that actually moves your outdoor speakers✔ Bluetooth that doesn’t quit✔ A device that you can install without needing an engineering degree✔ Something small enough to hide anywhere…then this is exactly the amp you want.😂 Bonus Humor SectionMy old amp weighed 10 pounds and sounded like it had asthma.This Fosi weighs nothing, and sounds like it drinks pre-workout.⸻⭐ Bottom Line:For the price, size, and performance, this little amp is the MVP of my backyard. If Fosi ever makes a “Pro Plus Ultra Nuclear Edition,” I’ll be first in line — but until then, this thing is staying right where it is, working flawlessly while I grill, chill, and pretend I’m an audio engineer.

I have re-entered the hifi hobby after retiring. After giving a good number of components from my music/surround system to family a few years ago, I wanted to find an economical way to drive my remaining Polk tsi100 surround speakers. Could I turn them into a nice 2 channel sound system in our sunroom...Yes! This Fosi audio tb20a pro along with a recently purchased Wiim Mini streamer and SMSL SU1 DAC, result in sound coming out of my Polks beyond what I thought possible.I am writing this while listening to George Shearing with Nat King Cole. The bass response is clear, unruffled or veiled. The midrange is clean and nicely separated at the lower end from the bass. Treble is crisp but not harsh at all. I am frankly amazed at what my old "surrounds" are capable of bringing to my ears, which are very good with no loss at any level from a recent audiology screen.The Wiim Mini has a 10 channel EQ. This, in combination with the remarkably capable DAC and this wonderful amp, give this reenergized hifi nerd great options in varied music genres. 2 channel rocks!Update December 2024. I switched the op amps to Sparkos dual discreet SS3602. even at 30% off these op amps cost more than the amp at full price. Worth it? Absolutely! Instrument separation and clarity actually increased and some slight increase in depth of sound stage is heard. Several speakers added to the collection as well! All Polks, some old as well as the ES15's on black Friday. This has become a blast and products like this Fosi and the Wiim mini and SMSL SU1 DAC allow for amazing sound!Final update 2/1/25: with the addition of the 48volt 5amp GaN power supply and the Polk ES15's returned (wonderful speakers) and replaced by Elac debut 2.0 b5.2's because of their remarkable clarity (let them break in!) and finally the addition of the Topping p50 linear power supply, my system is far beyond what I thought was capable at this tier.The point of my final update is this. If you are building a modest system as I did, realize that this amp is very scalable and if combined with other components that are also scalable, a stunning system can be had and built over time as budget allows.For that reason, I enthusiastically recommend this very scalable amp!

We recently bought a new home, which was pre-wired in certain rooms, with in-wall Yamaha 8 ohm speakers, capable of decent sound. We simply wanted to be able to connect to the existing wired speakers, and push sound from our bluetooth devices.For the price, especially given this Fosi unit uses a Texas Instruments chip to not only push the quality sound, but to also protect the speakers, and balance the resistance, this was a great deal. It was about 1/2 of the pricier models that use junk chips and far too many "features," which not only raises the price on those models, but also doesn't (IMHO) deliver the quality sound this little Fosi unit does.It's tiny... like very tiny, and is a solid little piece, but seems well-built, as far as the case, dials, and bluetooth antenna. I like that it has RCA input plugs, if not using Bluetooth, but even more so, it has built-in female banana plugs for outputting sound to your speakers (in my case, to a 6-channel, non-powered splitter, that sends the signal from this little powerful amp to the speakers (not included). If using bare wire speakers, the banana plug inserts unscrew enough to slide and secure the bare wires in as an option. Very easy.At first glance (sound?) when I hooked it up, I was not so impressed. There are only 3 dials - Volume, bass and treble. And with the bass and treble neutral, the sound was unimpressive and tinny. I used music on my iPhone I know very well, so I could judge the quality of the sound being sent to the Yamaha speakers, which we'd already tested with another source initially, so we knew their basic quality was there.Upon turning the Fosi's bass dial to 100%, it filled in the music nicely and more warmly. It is in NO way thump or "bassy," rather, it just fills in the hollowness that was present with a neutral setting. The treble seemed fine at neutral. This is in no way an audiophile piece of equipment - not even close. But it does seem to be a step up over some of the other, more expensive brands that flood the market, but have numerous noted issues across multiple reviewers.This little Fosi unit weights a few ounces, is super easy to set up, and was alllmost immediately compatible with my phone's bluetooth, although it wouldn't show up in my bluetooth available menu at first. A quick Google check revealed that the very brief instructions (with its exceedingly small and annoying print) failed to mention HOW to cause the unit to pair via bluetooth.Turns out the volume button doubles as a reset/pairing command, simply by pushing in to click, then my phone immediately saw and very easily connected via Bluetooth. There is zero, and I mean zero hissing or buzzing when no music is playing, or it plays at low volume. Like NONE (which I'd read in numerous reviews, causing me to want to try this nice little unit).The controls are simply laid out, and it was immediately compatible with my phone - what more could you want? This isn't going to blow you away, but if you simply want decent, clean sound out of decent, quality speakers, especially via Bluetooth, this unit is amazing. It just won't be bumping and thumping, but the sound pushed to all 6 speakers is impressive. It does not have the ability to push a mono signal equally to all speakers, but for standard stereo music, it doesn't seem to matter - not the most powerful option, but for the price and quality, I'm quite satisfied, and it seems very well built and solid from what I can tell.

Goed dingIk heb eerst een BT versterker met TPA3116 chip gebruikt maar was helemaal niet tevreden. Deze Fosi is echt geweldig als je een BT versterker zoekt voor de woonkamer of andere kamer. Makkelijk te installeren en te besturen.

Geiles kleines Sound-Monster – aber Fosi spart am Netzteil!Moin Leute, ich habe mir den Fosi BT20A geholt und muss sagen: Ich bin echt geflasht, was aus dieser winzigen Kiste für ein Sound rauskommt! Der Klang ist extrem klar und kommt mit ordentlich Wumms daher. Meine Yamaha Regallautsprecher haben durch den kleinen Amp richtig Leben eingehaucht bekommen.Auch bei der Bedienung gibt es absolut nichts zu meckern. Das Bluetooth läuft reibungslos, koppelt sich blitzschnell und die Verbindung steht danach wie eine Eins ohne nervige Ruckler. Das Gehäuse sieht schick aus, fühlt sich wertig an und die Regler drehen sich butterweich. Ein cooles Feature sind auch die Bass- und Treble-Regler direkt an der Front, mit denen man den Sound perfekt nach dem eigenen Geschmack aufpeppen kann.Der einzige Haken an der Sache ist das mitgelieferte Netzteil. Fosi legt standardmäßig leider nur eine schwächere Variante bei. Wenn man den Verstärker aber so richtig an seine Leistungsgrenze bringen und das volle Potenzial ausreizen will, braucht man eigentlich ein 48V/5A Netzteil. Das muss man sich dann leider separat dazukaufen. Schade, Fosi – das hättet ihr ruhig direkt in den Karton packen können!Für den normalen Hausgebrauch reicht das mitgelieferte Setup zwar locker aus, um die Bude zu beschallen. Wer aber das absolute Maximum rausholen will, muss halt nochmal ein paar Euro extra investieren. Insgesamt ist das Teil aber ein mega Preis-Leistungs-Kracher und ich würde es definitiv wieder kaufen!

Get a set of used 8 or 10” tower speakers, connect this, Apple music.. enjoy! Heaven!

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It seems that I got a particularly broken unit, in which the Bluetooth module caused an annoying crackling and buzzing sounds. The manufacturer's support team was simply professional and I was positively surprised by the level of understanding and support I received.