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The Fosi Audio BT20A is a compact, high-efficiency Class D stereo amplifier delivering 200 watts total power (100W per channel) with Bluetooth 5.0 connectivity and customizable bass/treble controls. Designed for audiophiles seeking a minimalist yet powerful Hi-Fi experience, it supports passive speakers and offers a stable wireless range of up to 50 feet. The integrated TPA3116 chip ensures low distortion and clean sound, backed by a 24V power supply and a 2-year warranty for reliable performance.
























| ASIN | B07BQC7GNL |
| Audio Output Type | Speakers |
| Audio Wattage | 200 Watts |
| Audio output mode | Stereo |
| Batteries Included | No |
| Batteries Required | No |
| Best Sellers Rank | #32,423 in Electronics ( See Top 100 in Electronics ) #45 in Hi-Fi Amplifiers |
| Brand | Fosi Audio |
| Colour Screen | No |
| Compatible Devices | Speaker |
| Connector Type | Bluetooth |
| Country of Origin | China |
| Customer Reviews | 4.4 4.4 out of 5 stars (9,022) |
| Date First Available | 22 May 2018 |
| Includes Rechargeable Battery | No |
| Includes remote | No |
| Item Dimensions LxWxH | 13.2 x 9 x 3.6 Centimeters |
| Item Weight | 680 g |
| Item dimensions L x W x H | 13.2 x 9 x 3.6 Centimeters |
| Item model number | BT20A |
| Manufacturer | Fosi Audio |
| Maximum Supply Voltage | 24 Volts |
| Minimum Supply Voltage | 12 Volts |
| Model | BT20A |
| Mounting Hardware | 1 electronic component amplifier |
| Mounting Type | Surface Mount |
| Number of Channels | 2 |
| Number of items | 1 |
| Operating Temperature | 20 Degrees Celsius |
| Output Power | 200 Watts |
| Product Dimensions | 13.21 x 8.99 x 3.61 cm; 680.39 g |
| Signal-to-noise ratio (dB) | 98 dB |
| Speaker Output Channel Quantity | 2 |
| Special Features | Built In Bluetooth, RCA |
| Specification Met | Meets Specifications |
| Tuner Technology | AM |
| Voltage | 230 Volts |
| Wattage | 200 Watts |
| Wireless Type | Bluetooth |
M**7
Works Good
I have been using this amplifier for a month now. It is working without any issues. The build quality of the amp as well as the adapter is very good. Looks tiny besides my old amp. My Old amp stopped working so am using this amplifier as an temporary alternative to power a set of Solidaire SS100 bookshelf speakers with a 12-inch woofer, a 4-inch midrange, and a 1-inch horn tweeter with impedance of 8 Ohms. Bluetooth range is also good. Comparable to my existing Logitech Bluetooth adapters. I have noticed it does not get warm on long usage when listening at acceptable volumes at home. The audio quality is flat and commendable in the Fosi amp, but I seem to miss the warmth my old Solidaire AS1200D amp provided. So, I tend to boost the lows and mids from the equalizer to get the desired effects. My decision on buying this over Aimyia amp was swayed because FOSI provide a warranty on their product, but Aimyia brand amps have no such mention in their listings.
@**!
Small on size big on sound.
Too tiny, infact the provided adapter brick is larger. Felt little warm after couple of hours of usage. Hopefully it will last for years to come. Have hooked my LG FB162 System speakers and the sound coming out is good. Even at low volume can get clarity. Bluetooth works like charm even when I take the source device in a different room still sound doesn't distort. Wish they have provided a remote or an app to control Bass and Treble.
S**G
Fantastic item for bluetooth
Being a Class D amplifier it is very compact in size, more so as the power supply is separated out by way of an adapter. The digital input (bluetooth etc) sounds great, if reasonably good speakers are used. However when analog input is there, the sound quality goes down remarkably. Therefore if the requirement is to use it with LED TV or record player (aux input), as in my case, better to go for Class AB amplifier for wholesome sound. That's why one star less.
S**K
Good quality sound especially at this price
Not only is the sound quality good, its very compact and has practically no setup process. A boon for those good speakers stranded without an amp
M**N
Great amp with amazing value for the price
Amazing amp that does the job well! Bluetooth sound signature is a treat for the ears. I wasn't happy with the sound via analog/RCA. But when I paired it with a decent dac it was perfect! Easy to operate.
A**R
Compact, easy to use
Works wonderfully for my old Sony AZ2D system. The original Sony touch panel was defunct and this Fosi module has brought my amazing speakers back to life. The Bluetooth is superb. No pairing, no “sleep mode” just leave it on and connect anytime without a fuss. Compact, solid metal construction, monochrome looks, and a vintage mechanical flip-switch for powering it in and off.
R**L
Perfirmance
So far working well👍
U**E
Best Sound quality of tiny item
Very good & economical at this price . Full paisa vasool .
T**Y
The Fosi Audio BT20A Bluetooth Stereo Amplifier has been a great little amp for a compact setup. I’m using it in a small turntable system, driving a pair of 3.5-inch bookshelf speakers, and it’s been more than capable. Power is plenty for a smaller room, and it sounds clean and enjoyable without feeling strained. The bass and treble controls are simple but effective, giving just enough adjustment to dial in the sound without overcomplicating things. The Bluetooth feature is a nice bonus and works well for streaming music from my phone when I don’t feel like spinning records. One of the biggest advantages is the size. It’s small, simple and clean looking, lightweight, and easy to tuck away, which makes it perfect for minimal or space-limited setups. It doesn’t try to be fancy, but it does exactly what it should. For the price, this is a very solid value. If you need an affordable, compact amp for a small speaker setup, this is an easy recommendation.
N**F
Works perfectly! I used this to fire up a pair of outdoor speakers that came with our house, and it’s been flawless. Super easy to connect via Bluetooth, and the sound quality is great — clear, strong, and consistent. I’ve left it on pretty much all the time, and it’s been running solid for about 8 months with no issues at all. For the price, this little amp delivers big performance. Highly recommend.
A**M
I had the non-Bluetooth version which unfortunately died a death during a house move. Loved the simplicity of the design so much I went for the bluetooth version. Fantastic, no issues whatsoever, easy setup, great sound quality and fantastic range on the bluetooth. I can go upstairs in our old victorian terrace with my phone and not interrupt the music playing downstairs.
A**M
Mój amplituner Onkyo zajmował miejsce w moim minimalistycznie urządzonym salonie , dodatkowo nie posiada bluetooth , więc zakupiłem Fosi Audio , i.... Nie jestem melomanem i pewnie dla tego :-) nie słyszę różnicy między tymi wzmacniaczami , więc polecam wam też bo większość z was tak jak ja jej nie usłyszy
M**L
I’ve had it for a year and no problems, great sound
Trustpilot
1 month ago
1 month ago