Fosi Audio 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 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 Impressions This 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 happiness No proprietary weirdness. No random 4-pin blue plug. No tears. 🎵 Sound Quality Compared 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 pretending Honestly, for a backyard setup that sits in a protected cabinet, this little thing is the perfect “sweet spot.” 📡 Bluetooth Fast 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 Verdict If 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 Section My 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.

Picked this up to run a pair of old Cerwin-Vega RE series speakers from the 90s, and it worked out great. It’s got plenty of power to drive them and they still sound awesome. The Bluetooth makes it super easy to stream music without dragging out a full AV setup, which is exactly what I was trying to avoid. Setup was simple, and once it was hooked up, it just worked. No messing around, no headaches. It’s also nice not having a big receiver taking up space—this keeps things clean and minimal. Overall, great little amp that makes old speakers useful again without all the extra clutter.

I bought this to use as a “loaner” setup to lend to a friend who doesn’t have her own amp/receiver, and before I let it go I hooked it up to my vintage Sansui SP-1200 speakers. I don’t think I am going to loan it out after all 😂 Nice little unit which takes up much less space than a full sized receiver, which is really handy if space is limited or you’ve only got one main receiver & speaker setup, but want to use some other speakers elsewhere. It would be very portable as well. It has a very solid build quality, it looks and feels well made. The body is metal and so are the knobs and switch; none of the parts or pieces feel chintzy to the touch. My Sansui SP-1200s are 3-way, 5 driver speakers which include a single large ~10” ported sub, 2 mids and 2 tweeters. They are rated at 60W power input, sensitivity of 92dB, 8ohms impedance. The amp makes these speakers SING! Music listened to so far has been (volume cranked) Marcus King, The Teskey Brothers, local fave Ty Pow & The Holy North (do yourself a favor and look them up), Led Zeppelin louder than is comfortable for my ears, some Tribe Called Quest (bass is nice & clean, vocal clarity also good, full range of sound) as well as some jazz and classical (softer volume, lol). My speakers were able to handle the amp turned up pretty loud as well; volume at the 1 o’clock position was comfortably loud filling a living room, 3 o’clock is about as loud as I ran it and you can feel the music in the floors. (For reference, min volume is at 7 o’clock, increasing clockwise, with max all the way around thru 12 to nearly 6 o’clock). Speaker wire inputs look like they are only banana jack ready from product pictures, but they also unscrew to accept a bare speaker wire or a pin-type wire end. I got some of the screw-on type banana ends to put on my bare wires. Fit is nice and tight in the plugs. Note that the power supply which comes in the box provides 32v, and as another customer mentioned, you won’t get the full 300W output without purchasing a 48v power supply. Related to this, the output rating of 300W is into 4ohms, so with speakers like mine rated at 8ohms impedance, the amp will output approx 150W. It should also be noted that if you’ve got some bookshelf speakers or other small speakers which can’t handle the power output (rated power handling of the speakers, and impedance, should be listed on the back of your speaker cabinets), you can use this but you’ll have to keep the volume turned down so you don’t blow them. The amp says it is rated to handle “terminating impedances” from 2-8ohms. Most speakers will be between 4-8ohms. Happy listening!

After my big ‘stereo down size’ about 6-8 years ago, I ran my streamers into a Kinter K2020a+ and a Polk Audio shelf speaker set… and I was as happy as a kid in a candy shop. Recently I sensed one of the channels was beginning to get a little less clean and decided to cast around for an upgrade. I actually had the next model down (BT10?) in my basket, read about the more powerful BT20 Pro, and made the leap. Glad I did! Product is elegantly packaged. Bluetooth connection was a breeze. Press the volume knob for 5 seconds to disconnect BT and connect to another source. EQ is simple and effective. I truly dig the way under stated light gray steel appearance, Power switch and 3 knobs on the face. Device feels solid. Dual speaker connection types, easy to hook up. Less is more. Proof is in the pudding - the sound.. and it doesn’t disappoint. Versus the Kinter (which, of course, does not punch as many watts) it is clearer and deeper, and, if you want, much louder. For me the key is clarity at a lower volume (I am running it as sound in a modest art studio). Whether it is piano jazz from Fergus McCreadie, new acoustic from Halaiker, experimental from Ezra Feinberg or African string music… it all comes thru in great style. It will rattle the windows if turned up, but I really love the clear almost analog sound of all my genres at medium to low levels. Great stuff and worth the modest $ upchrge.

Short and to the Point Review: Well-made small Class D amplifier with good separation and very musical. Use for small home stereo system or PC passive speakers. R/L RCA inputs, L/R passive speaker outputs, Bluetooth, Treble/Bass/Volume controls. Long and Rambling Review: I have used this amp daily since I purchased it. Plenty loud if you want it. Very clean sound. I’m using it with a pair of passive Edifier speakers. I have been using Edifier powered Class D speakers on my PC for 5 years and love them. Decided it was time for something new and transferred the Edifiers to one of my TV’s. This Fosi BT20A Pro has better sound than the Edifiers and that is saying something. The Edifier passive speakers are P12’s and are identical to the powered R1280DB minus the amp. So the comparison in sound quality should be valid. This amp ships with the 32V supply. You can buy the 48V power supply separately for more power output but it’s 2/3’s the price of this amp. That’s my only con, this amp should ship with the 48V supply. Charge a bit more Fosi, but ditch the lower power supply or give an option when purchasing the amp. I found a website that puts various amps through their paces, audiosciencereview. Their methodology basically blew me away. I’ve been involved in audio since the 1960’s and thought I was well versed in amplifier technology since it was part of my engineering major and licensing. These guys take it to another level I didn’t even know existed. Anyways they gave a strong recommendation on this Fosi amplifier and that made me comfortable in making this purchase. If you visit their website, don’t worry about interpreting the graphs, they explain the results in English. I have an audiophile system (actually many of them – Sansui, Pioneer, Kenwood, Yamaha etc from the 1970’s) as I refurbished consumer to professional reel-to-reel, power amps, preamps as a side gig and sold gear all over the world for many years. So, I guess those are my Bona fide’s as I can be extremely critical of how equipment is supposed to sound. Originally, I was not a fan of Class D amps especially listening to music with them. Great for phones – small size, large sound, small PC speakers but not a real stereo system. The Edifiers changed my mind and this Fosi has shown me that this class of amps has improved markedly over the years. One Caveat: if your phone is nearby with BT enabled and you turn the amp on, it will pair to your phone disabling your RCA inputs from your PC. Gets me every time. Retired Military Aerospace and Industrial Manufacturing Engineer

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.

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This is a honest review of FOSI BT20A PRO. After trying a few Inexpensive yet good class D amps, I decided to go for the fosi bt20a pro, as its based on Tpa3255 and has the bluetooth & rca connection options (till 6.months back there were too few BT amps from fosi or aiyima) Here is my review Build : Pretty solid, everything is upto the mark, the aluminium used high grade anodised one, no creaks and squeaks anywhere when you hold the amp. All the three knobs (bass treble and Volume) are sturdy but somehow the one I got had a kinna wobbly volume knob, dunno if it's just me or this is the way it is. The back connectors and sockets are placed pretty close to each other but with some small maneuvering everything can be pushed, tied and fixed. Accessories There comes a bluetooth antenna the standard one & decent enough, which you have to add yourself. POWER SUPPLY : the amp is rated to work from 24v to 48v power supply but is shipped with a Fosi branded 32V 5A one.. It does what is expected of it and the output is sufficient..(at lest fir my use case scenario is more than enough) The wire provided with the power supply adapter is of adequate length, the block and wires all look decent and feel study enough . Checked its voltage and it does produce what is claimed 32.4V to 32.5V. Functionality.. Bluetooth connects in a jiffy and the coverage is good. Kinna tricky sometimes to get the connection changed but by and large it's easy to switch from BT to RCA There is also a socket of 3.5mm pre out at the back which can be used to supply signals to an active subwoofer which is awesome in my view... But I don't think I ll ever need that because the amp giving enough thump already with the pair or my Sony passive speakers. This same socket can be used to connect this amplifier as a preamp to another amplifier if you want.. ONE VERY IMPORTANT THING : The amp comes with replaceable op amp chips, (which require the user to remove the screws and slide out the motherboard and then chnage the op amp chips) the more enthusiastic audiophiles who like to experiment with different sound signatures can change them according to their preference.. FOSI has suggested a number of op amp chips that one can try after purchasing them from market or from online.. (there a few available at Amazon India as well) In my personal view it is sounding pretty good as it is so for majority of users there is absolutely no need to experiment with the op amp chips. Audio quality Please note I use my SONY BOOKSHELF SPEAKERS with this.. The one which came with my Az2d music system they have a kind of plasticky cone hence the bass is pretty tight and I love that. Via Bluetooth it sounded pretty decent (please note I use Spotify with highest streaming audio quality on an iPhone) Through RCA I stream via my Google chromecast audio and the sound is fantastic. Over all its pretty loud, the tone knobs do a good job and the best part is there is a neutral point for both bass and Treble exactly in the center so you get a good reference point.. The low freq response is awesome which is genuinely deep and tight, the high freq are pretty good too but may be a bit more wanting like 10% lesser than the bass response... But that's just me... Over all it has played everything nicely that I have thrown at it... Mids are pretty good ( as you are to manage the mids via your preamp etc, you can further enhance them as well) Be it the jazz, or Bollywood music, or ghazals by Mehdi Hassan and Live Indian Classical renditions in both vocal and instrumental, it played everything nicely (of course you have to adjust the knobs according to the type of music as well as the source quality) Edit : after using for more than a month I can say the sound is pretty neutral and with a wide stage, the high frequencies need a tad extra kick for my liking so I am trying to arrange a preamp now to boost the quality further.. But one thing is for sure, via Google chromecast audio (which technically means that there is a proper DAC before the RCA input (as the GCA has a dedicated DAC in it) this thing just sounds so great.. Please note : type of drivers (speakers) plays another huge role so please use atleast half decent ones with these... All in all I am pretty happy, would have loved a fully functional remote and a knob to manage the mids too (I know that's tricky) Would have loved to have couple of more connectivity options like optical etc but I know I will never use them so doesn't matter, but having them would have been great even if just for academic purposes... In the end I can safely say that its a pretty good small package Would highly recommend it as tpa3255 chip perfoms extremely well and with its implementation on the fosi board it produces very loud audio without much distortion... There is no hissing or clicking when the amp is idle and it doesn't get hot (that much) as well.. Thanks

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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.

I am incredibly impressed with the Fosi Audio BT20A. Setting it up was an absolute breeze, taking only a few minutes from unboxing to playing music. It integrates seamlessly with my turntable setup, delivering clean, crisp, and punchy sound that breathes new life into my vinyl collection. The ability to switch over to Bluetooth streaming is a game-changer. The wireless connection is rock-solid, has great range, and makes it effortless to stream playlists straight from my phone. For its compact size and affordable price, the sound quality and power output are remarkable. It fits perfectly on my shelf without cluttering the space. If you need a reliable, budget-friendly amplifier that handles both classic analog vinyl and modern wireless streaming without any fuss, this is the one to get!