Fosi Audio BT20A Bluetooth Stereo Amplifier, 2 Channel Home Audio Component Amplifiers for Passive Speakers, Mini Class D Amp Receiver 200W for Indoor/Outdoor/Garage/Ceiling/Bookshelf Speaker
$79.99
Price: $79.99
(as of Feb 12, 2026 22:04:02 UTC – Details)
Product description
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. Bluetooth Amplifier home audio Merchant Video
Simple yet Powerful Mini Amp
Guided by our mission of “Redefining HiFi with Unmatched Value”, Fosi Audio continues to fuel its passion for the Hifi industry, ramp up R&D efforts, and co-create new HiFi equipment with users. We pledge to bring more amazing Hifi gear with high value for the price, innovative design, cutting-edge technology, and premium quality, to audiophiles worldwide.
MAX Power Output: 100W x 2Terminating Impedance: 2 Ohm – 8 OhmTHD ≤ 0.04%, SNR ≥ 98dBPower Adapter: 24V/4.5A, DC Input Range: 12-24V
A No-Frills Amp
100 watt per channel power output can drive most home passive speakers to create astonishing sound.
With a Nice Consistent Resistance
Fine-tune your sound with the smooth bass and treble adjustment for optimal speaker performance.
Bluetooth Amplifier for Speakers
Instant setup with phones, tablets, and almost any other Bluetooth-enabled devices.
1 Mini but Powerful
2 Bass and Treble Control
3 Bluetooth Connectivity
Crystal-Clear Hi-Fi Audio
Exceptional clarity at high volumes, with <0.04% distortion.
Power the Pair of Indoor/ Outdoor Speakers
Paired with your audio device over Bluetooth or RCA cable, you will get a rich and clear sound.
Advanced Circuitry Architecture
The Texas Instruments TPA3116D2 Chip presents music with rousing highs and deep lows.
1 High-Performance
2 2.0 Channel Amp
3 Exquisite Design
Safe DC Outlet
Input: Bluetooth and RCA; Output: Passive Speakers
1 Back Panel
2 Front Panel
3 Side Panel
4 Upper Panel
Friendly Solutions Guide
Q: How do I switch between RCA and Bluetooth on the BT20A?
A: Bluetooth takes priority over RCA. To switch to RCA, restart the device or disconnect Bluetooth.
Q: What is the position for flat frequency response on the amplifier?
A: The middle position (12 o’clock) provides a flat frequency response.
Q: What type of DC plug do I need for the BT20A’s power supply?
A: The DC barrel connector dimensions are 5.5*2.5mm.
Q: What’s the upgraded version of the BT20A amp, and what accessories come with it?
A: -If you’re seeking the upgraded version of the BT20A, please consider the BT20A Pro amp. -In terms of accessories, a set of 24V/4.5A power cables and an instruction manual will be provided. Note: Remote control, banana plugs and extra cables are not included.
Q: Can you control the BT20A’s volume from a tablet or phone via bluetooth connection as I do not want to walk to the device to alter the volume. A: You can control the volume directly from the audio source via the Bluetooth connection.
Q:Sound quality is not good? A: – Ensure that all cables are properly connected. -Adjust the treble and bass controls on the power amplifier to achieve the desired sound. -Try changing the sound source, speakers and cables to test. Please use high-quality music input.
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Customer Reviews
4.5 out of 5 stars 9,395
4.5 out of 5 stars 2,467
4.6 out of 5 stars 3,578
4.4 out of 5 stars 2,884
4.4 out of 5 stars 1,586
4.4 out of 5 stars 483
4.4 out of 5 stars 307
Price
$79.99$79.99
$99.99$99.99
$49.99$49.99
$89.99$89.99
$109.99$109.99
$89.99$89.99
$131.99$131.99
Type
Bluetooth 2.0 CH Amp
Bluetooth 2.0 CH Amp
Bluetooth 2.0 CH Amp
Bluetooth 2.1 CH Amp
Bluetooth 2.1 CH Amp
Bluetooth 2.0 CH Amp
Bluetooth 2.0 CH Amp
MAX Power Output
100W x 2
300W x 2
50W x 2
50W x 2+100W
165W×2+350W
100W x 2
105W×2@4Ω
Input
Bluetooth + RCA
Bluetooth + RCA
Bluetooth + 3.5mm AUX
Bluetooth + RCA
Bluetooth + RCA
Bluetooth + RCA
Bluetooth+RCA+USB+Optical+Coa
Output
Passive Speakers
Passive Speakers+Pre-Out
Passive Speakers
Passive SPK+Active/Passive Sub
Passive/Active Speakers/Sub
Passive Speakers
Passive SPK+ Pre-Out+Headphone
Treble & Bass Control
✔
✔
✔
✔
✔
✔
✔
THD
≤ 0.04%
≤ 0.005%
≤ 0.04%
≤ 0.04%
≤ 0.3%
≤0.03%
≤0.03%
SNR
≥ 98dB
≥108dB
≥ 98dB
≥ 98dB
≥ 108dB
≥100dB
≥100dB
Terminating Impedance
2-8 Ohm
2-8 Ohm
2-8 Ohm
2-8 Ohm
2-8 Ohm
4-8 Ohm
4-8 Ohm
Power Adapter
24V/4.5A
32V/5A
19V/4.74A
24V/4.5A
32V/5A
24V/4.5A
24V/4.5A
Work Voltage
AC 110V – 240V
AC 110V – 240V
AC 110V – 240V
AC 110V – 240V
AC 110V – 240V
AC 110V – 240V
AC 110V – 240V
ENTRY-LEVEL POWER AMPLIFIER: Experience powerful sound with the BT20A Bluetooth amplifier, boasting an impressive 100Wx2 maximum output power. It can power multiple speaker cabinets, which can be used at home or in small venues
EFFECTIVE, SIMPLE, AND NO FRILLS: The compact design allows it to be used in any space where passive speakers are required. It can be used in an office, a bedroom, a living room, a garage, or even on the patio
EASY TO SET UP: The 2 Channel amplifier has a straightforward installation and a one-touch power switch for easy operation. The smooth bass and treble controls allow tuning to taste and the connected bookshelf speakers
BLUETOOTH AND RCA INPUTS: The seamless Bluetooth connectivity allowing you to stream music directly from your phone without any dropouts or delays, delivering crystal-clear sound and impressive volume for your home audio setup
ALL-BLACK DESIGN: This Class D amplifier features an integrated one-piece design that not only adds to its looks but also makes it more durable. With its stylish look, it fits wonderful on any shelf and complements most home decor
9 reviews for Fosi Audio BT20A Bluetooth Stereo Amplifier, 2 Channel Home Audio Component Amplifiers for Passive Speakers, Mini Class D Amp Receiver 200W for Indoor/Outdoor/Garage/Ceiling/Bookshelf Speaker
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DesertScottAZ –
Solid little unit.
I got this to run some higher end home audio speakers installed outside for the yard/pool area at our house. The speakers are $300 each and I had been running it on an older Sony coil-based home theater amp because I thought I needed the zones and independent volume controls/management for tone/eq. The amp in the cabinet indoors was putting out quite a bit of heat when it was powered on whether they were in use or not. The wiring was a total mess and I bluntly didn’t enjoy dealing with it. I went in to this project assuming I was going to get a Denon, Onkyo, Yamaha, or some home audio mixer board + eq, or something fancy with roughly $2k budget… I was on struggle street trying to piece it all together. I only need a simple input amp. I have a cheap class T amp in my garage that works for what I am doing there, but the audio quality is trash. I rolled the dice and picked up a few of these and man, they blew my mind. They have a lot of punch/power and the audio quality is REALLY surprising compared to the old stuff I had. The BT connection is ROCK SOLID. A lot of these cheap china BT interfaces are trash and buggy. This thing pairs right up and is solid and reliable. I’m waiting on the splitters to feed the source to all of them, but per zone, they’re superb. Super straightforward install and good labeling, pair with FosiXXX and go for BT. It’s a small, light package and the box it comes in is pretty good for it’s weight and has some heft. Not sure whether the weight is from the case or components, but it’s a mosfet so we’ll see about heat dissipation down the road and whether it does a thermal cutoff or not. I might end up getting more for the garage after a few sessions in the backyard. I was pleasantly surprised!
Tony –
Plenty of power for its size.
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.
Richdude –
This is an excellent product
TL;DR: This works exactly as it should. Great piece of equipment is such a tiny form factorI’ve been meaning to setup a more permanent outdoor speaker solution to my backyard and was going to go with the old fashioned “run 200 feet of speaker cable” because the high receiver I bought was pretty far away and I was going to use Zone 2 for the speakers. But this little package came up on my searches and it was exactly what I wanted and more. There is an area in the backyard that we set up outdoor movies at and I use a portable speaker for sound. Instead it dawned on me that not only can i stream music from any source with this bluetooth connection to this device, I can also double up and use it for outdoor movies if I place them correctly. Well I found an outdoor telephone jack and indoor jack and I was able to run audio cable outside through those openings which were right next to where I would put the movie screen. So I was able to put two outdoor speakers in a place so that it can provide sound for movies AND they are in a general area that I can stream/play music for the backyard in general. No need to wire anything from the receiver and eliminates the need to bring out a boombox outdoor speaker for movies.What I was really happy about is how fast and solid the bluetooth connection is. I use an old laptop for streaming music and store all my ripped CDs. I thought I was going to have to hardwire the laptop to this Fosi amp because the laptop is like six years old. After a little work and trial and error, I finally figured it out and it works. The first time the laptop had a hard time finding it but now that it is in the list of known devices, it connects flawlessly. I tried iphones, tables, etc. and all of the newer devices find it with no problems. Even my echo show found it and its about 40 feet away in another room. Movies sound great, have my Lounge music running at night and I’m so happy about this setup. And, going back to my resistance to running cable, I only need 30 feet of outdoor cable for both speakers so it was convenience too.Highly recommend this product: very inexpensive, does exactly what it is supposed to and greatly enhances the flexibility of what you can do.
Paul H. –
Great amp… delicate switch.
I love the sound quality and for such a tiny thing it is fairly robust. I’ve been using this now for 3.5 years without any problems until today when the micro on/off switch busted inside. It is the only part that could stand to be beefier. I figured it was toast but I took it apart, removed the switch, and found two of the 7 contacts that I could jump with a blob of solder. It works great again and I just use the plug as the on/off.One other very minor inconvenience is that it doesn’t auto-connect to my phone but I can live with that.
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.
Artur M –
Mój amplituner Onkyo zajmowaÅ‚ miejsce w moim minimalistycznie urzÄ…dzonym salonie , dodatkowo nie posiada bluetooth , wiÄ™c zakupiÅ‚em Fosi Audio , i…. Nie jestem melomanem i pewnie dla tego 🙂 nie sÅ‚yszÄ™ różnicy miÄ™dzy tymi wzmacniaczami , wiÄ™c polecam wam też bo wiÄ™kszość z was tak jak ja jej nie usÅ‚yszy
michael –
I’ve had it for a year and no problems, great sound
marex77 –
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.
James H –
Last year I had bought a Tangent Ampster BT II amplifier, which had worked great, however it recently had an issue with the power switch, so had to be sent away for repair.As I used it in my office I needed a replacement and decided to order this amplifier.I thought the Tangent Ampster was small, but this BT20A amplifier is ridiculously small!This is mainly as the power supply is external to the amplifier, which itself is bigger than the amplifier.I have it connected to a pair of Mission LX-1 MKII speakers, and I am happy to say that this amplifier easily runs these speakers, with no sign of distortion.I appreciate the treble and bass controls, as by default the treble did sound lacking and a bit stifled.The dials are nice and smooth, and the power switch toggle works without issue.At this size and price you only get 1 set of RCA inputs and 1 set of speaker outputs, but for my use case this is fine.Bluetooth works seamlessly, and the audio quality is about on par with direct RCA connection.Be aware that if you connect via bluetooth it will override the RCA input, even with no music played over bluetooth.I will say, as others have, that being able to connect to the amplifier via bluetooth without being asked for a code is a potential issue, I live in a block of apartments, so anyone could connect to it if they tried.I don’t hear any hissing when not playing music, so that is another plus.Overall a great little amplifier for the price, once my other amp is back from repair I will probably relegate that to the living room as it has a remote control that is more useful.