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

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

I have been using the Fosi Audio BT20A Pro for over one year with my Pioneer and Kenwood speakers, and it has been an excellent experience. The sound clarity is outstanding, with clean vocals, detailed mids, and crisp highs. The separate Bass and Treble controls are very useful, allowing me to fine-tune the sound according to my listening preferences and different music genres. The bass response is impressive when paired with capable speakers. It delivers deep, controlled bass, and for my setup, I don't feel the need for a separate subwoofer. The amplifier provides enough power while maintaining excellent clarity even at higher listening volumes. After one year of regular use, the amplifier has remained reliable and continues to perform flawlessly. Overall, the Fosi Audio BT20A Pro offers exceptional sound quality, useful tone controls, and excellent value for money. I highly recommend it to anyone looking for a compact, powerful stereo amplifier.

Tiny but powerful. Very good product for the price it comes at. The only reason for removing one star is the quality of the audio. It sounds very good with options to adjust base and treble, but no option to adjust the mid-range (vocals) which seem to always be higher and louder than the bass and treble at the right levels.

I have been thinking about setting up a music system that delivers amazing quality for a small space, especially for long listening sessions. Using in-ear pods for extended periods can be uncomfortable and potentially harmful to the ears, so I decided to repurpose some of my existing speakers that hadn’t been used in a while. My setup includes a MacBook Pro, connected via the 3.5mm jack to the Fosi BT20A Pro amplifier, driving Polk RTi FXi A6 surround speakers. I’ve chosen this configuration because the FXi A6 offers a frequency response that suits my needs perfectly. I primarily use Apple Music, streaming at 98 kHz, and the results have been impressive. To further enhance the audio quality and fully utilize Apple Music Hi-Res, I bought the Fosi DS1 DAC. After adding the DS1, the total listening experience became phenomenal. Thank you, Fosi, for such innovative products at such great prices. Need not spend lakhs of money to hear the same music. Design and Build Quality One of the first things you’ll notice about the Fosi BT20A Pro is its solid construction. The metal housing gives it a premium feel, and its compact size makes it easy to fit into any setup, whether on a desktop or as part of a larger home audio system. Sound Quality: The sound is clear and well-balanced, with a good sense of depth and detail. The amp does a great job of driving speakers to their full potential, delivering crisp highs, detailed mids, and punchy bass. With the addition of the Fosi DS1 DAC, the audio experience reaches new heights, fully capturing the richness of Apple Music’s Hi-Res offerings. Low Noise Floor: Even at higher volumes, the amp remains quiet, with no noticeable hum or hiss. This makes it a great choice for critical listening in quieter environments. Value for Money Given its price point, the Fosi BT20A Pro offers excellent value. It’s a budget-friendly option that doesn’t skimp on quality, making it an ideal choice for those looking to upgrade their audio system without breaking the bank. • Affordable: Considering the performance and build quality, the BT20A Pro is priced very competitively. It offers features and sound quality that you’d typically find in more expensive models. • Long-Term Investment: Thanks to its robust build and reliable performance, the BT20A Pro feels like a piece of equipment that will last, making it a sound investment for any audio enthusiast. Conclusion The Fosi BT20A Pro is a fantastic little amplifier that punches well above its weight. It offers great sound quality, versatile features, and solid build quality, all at an affordable price. Whether you’re a casual listener or an audiophile on a budget, this amp is sure to impress. With the addition of the Fosi DS1 DAC, the listening experience becomes exceptional, fully taking advantage of Hi-Res audio formats.

Best D-class amplifier. Amazing sound quality even from decades old speakers. Doesn't overheat like other amplifiers when played on high volume for a long period. Bluetooth connects very fast, it connects under a second, and the bluetooth range is very great as well, it doesn't disconnect even if there are multiple walls in between and the device is meters away. Knobs for volume, bass, treble are good. I personally like the toggle switch for on/off. Value for money? Indeed. If the speakers which are being connected to it have woofers, there is no need for separate active woofers, this handles them good and every frequency- high (in tweeters), mid (vocals in mid-freq. drivers), and lows (woofer- bass) are good and audible clearly.

For me this amplifier work very well with my old speakers of SL3147 3in1 stereo player. Crisp and clear sound quality. Worth every penny spent on this amplifier . Cute and compact size

While unboxing I laughed at the size of Tiny Metal box Amplifier Fosi bt 20a pro's size But after connecting to my customized 8 ohms / 100 watts bookshelf speakers and Apple Music from my OnePlus 7pro OMF (Oh My Fosi) I was Amazed and Mind blown by its Sound quality. Truly anyone can buy without 2ns thought, for it's price & size , it delivers more than enough to fulfill the bedroom as well living room too if right pair of bookshelf or Tower speakers connected.to this Amplifier. My sincere gratitude to Fosi engineers for designing such an hi-fi audio in such a small size cute & Minimalistic Amplifier unit and Amazon delivered in 2 days. Now I'm enjoying my music daily again after long time. Last but not least No heating issue even after 6+ hours of playing but with 32v power supply came with package, The output is more than enough for me.

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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!

PROS - Drives my 100W speakers beautifully - A very discrete unit, fits in the palm of your hand - Easy to plug in and conceal if necessary - The case has a really good feel to it - Nice design and smooth corners - Has subwoofer connection to add bass should your speakers/setup require - Bluetooth connectivity excellent even when going downstairs with mobile in pocket (2-floor house) - Being able to disconnect the paired bluetooth device is a brilliant idea - Blue LED showing Bluetooth is paired - Red LED showing power on - Power adaptor has perfectly acceptable size - Midpoint knobs for treble and bass, allowing setting these at zero (brilliant feature) - Bass and treble controls produce excellent results in sound - Red volume knob of larger size - I'm sure there are many technical reasons why this is an excellent unit CONS - I do not have any issues with this product. SUGGESTIONS: - Provide rubber feet to install the unit vertically on its side (however anyone can get their own rubber feet or even velcro straps/adhesive velcro straps therefore CONCLUSION It's hard to think what else could be improved with this product (maybe create 10 or 15 case colours to suit the needs of customers whose audio setups need to sound as good as they look). I'll get rid of my Cambridge Audio amplifier as soon as I can because it's simply no longer necessary to have something of that size to drive my audio needs.