As an person who’s used to high-end tube amps and large receivers, I wasn’t expecting much from such a small, affordable amp.
No, it’s not going to replace your multi thousand $$$ boutique amp for critical audiophile listening or bragging rights, but for 99% of the population or normal TV, movie, game and music listening it’s awesome.
I loved it so much that I ended up buying a second one.
This little powerhouse easily drives my JBLs and KEF LS50 speakers to impressive volume levels with crystal-clear clarity. It’s perfect for my living room TV setup.
The Bluetooth feature works flawlessly. I also appreciate that it comes with a remote. For the price, this amp is a steal. If you’re looking for a compact, budget-friendly amp that still delivers excellent performance, I highly recommend it!
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$79.99 with 11 percent savings
List Price: $89.99 
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This item: 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
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This Item  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 | Recommendations  |  |  | |
| Price | -11% $79.99 List: $89.99 | -17% $149.99 List: $179.99 | $79.99 | $8.99 |
| Delivery | Get it as soon as Monday, May 5 | Get it as soon as Monday, May 5 | Get it as soon as Monday, May 5 | Get it as soon as Monday, May 5 |
| Customer Ratings | ||||
| Sold By | Fosi Audio | Fosi Audio | Jancane LLC | Fosi Audio |
| number of channels | 2 | 2 | 2 | 2 |
| voltage | 230 volts | 48 volts | — | 3 volts |
| output power | 200 watts | 235 watts | 600 watts | — |
| specification met | CE, FCC, RoHS, WEEE | FCC | FCC | RoHS |
| mounting type | Surface Mount | Surface Mount | Freestanding | Tabletop |
From the brand
Amplifying Your Voice, Shaping Our Innovation
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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.
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Bluetooth 5.0 Stereo Amplifier
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2.0 Channels Home Audio Amp
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Subwoofer Amplifier & Mono Amp
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Fosi Audio V3
TPA3255 Class D Home Audio Mini Speaker 2 Channel Amp 300 Watts x2
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Product Description
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 2
- Terminating Impedance: 2 Ohm - 8 Ohm
- THD ≤ 0.04%, SNR ≥ 98dB
- Power Adapter: 24V/4.5A, DC Input Range: 12-24V
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A No-Frills Amp
100 watt per channel power output can drive most home passive speakers to create astonishing sound.
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With a Nice Consistent Resistance
Fine-tune your sound with the smooth bass and treble adjustment for optimal speaker performance.
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Bluetooth Amplifier for Speakers
Instant setup with phones, tablets, and almost any other Bluetooth-enabled devices.
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Crystal-Clear Hi-Fi Audio
Exceptional clarity at high volumes, with <0.04% distortion.
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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.
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Advanced Circuitry Architecture
The Texas Instruments TPA3116D2 Chip presents music with rousing highs and deep lows.
Find More Bluetooth Amplifier from Fosi Audio
 BT20A |  BT20A PRO |  BT10A |  BT30D |  BT30D PRO |  MC101 |  MC351 | |
|---|---|---|---|---|---|---|---|
|
Customer Reviews
|
8,853
|
1,801
|
3,437
|
2,692
|
1,069
|
311
|
77
|
|
Price
| $79.99 | $79.99 | $49.99 | $79.99 | $98.99 | $79.99 | $185.99 |
|
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 2.1 CH Amp |
|
MAX Power Output
| 100W x 2 | 300W x 2 | 50W x 2 | 50W x 2+100W | 165W×2+350W | 100W x 2 | 165W x 2 + 350W @ 4Ω |
|
Input
| Bluetooth + RCA | Bluetooth + RCA | Bluetooth + 3.5mm AUX | Bluetooth + RCA | Bluetooth + RCA | Bluetooth + RCA | Bluetooth 5.3+RCA+COA+OPT+USB |
|
Output
| Passive Speakers | Passive Speakers+Pre-Out | Passive Speakers | Passive SPK+Active/Passive Sub | Passive/Active Speakers/Sub | Passive Speakers | SPK OUT+SUB OUT+3.5mm PRE OUT |
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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 | 32V/5A |
|
Work Voltage
| AC 110V - 240V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V |
Product information
| Item dimensions L x W x H | 5.2 x 3.54 x 1.42 inches |
|---|---|
| Voltage | 230 Volts |
| Manufacturer | Fosi Audio |
| Maximum Supply Voltage | 24 Volts |
| Mounting Type | Surface Mount |
| Brand | Fosi Audio |
| Number of Channels | 2 |
| Output Power | 200 Watts |
| Specification Met | CE, WEEE, FCC, RoHS |
| Material | Metal |
| Product Dimensions | 5.2 x 3.54 x 1.42 inches |
| Item Weight | 1.5 pounds |
| ASIN | B07BQC7GNL |
| Item model number | BT20A |
| Customer Reviews |
4.5 out of 5 stars |
| Best Sellers Rank | #3,835 in Electronics (See Top 100 in Electronics) #9 in Audio Component Amplifiers |
| Is Discontinued By Manufacturer | No |
| Date First Available | March 26, 2018 |
| Language | English |
| Country of Origin | China |
Warranty & Support
Product Warranty: For warranty information about this product, please click here
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Bridges The Gap
I’m an old guy with over 300 gb music on my computer. I had 2 really good Denon bookshelf speakers sitting around collecting dust. I got tired of listening to music on computer speakers and wanted an upgrade. This small amp took care of it for me. I just needed something to power the Denon speakers. This small amp is really great. Nice and simple. Plug in the speakers and a source for music and you’re done. The bluetooth feature works well as I can stream from iPad or iPhone. This is a great little amplifier that now allows me to listen to good speakers and music from my computer. I think it was a great purchase.
Top reviews from the United States
There was a problem filtering reviews. Please reload the page.
- Reviewed in the United States on January 14, 2025
As an person who’s used to high-end tube amps and large receivers, I wasn’t expecting much from such a small, affordable amp.
No, it’s not going to replace your multi thousand $$$ boutique amp for critical audiophile listening or bragging rights, but for 99% of the population or normal TV, movie, game and music listening it’s awesome.
I loved it so much that I ended up buying a second one.
This little powerhouse easily drives my JBLs and KEF LS50 speakers to impressive volume levels with crystal-clear clarity. It’s perfect for my living room TV setup.
The Bluetooth feature works flawlessly. I also appreciate that it comes with a remote. For the price, this amp is a steal. If you’re looking for a compact, budget-friendly amp that still delivers excellent performance, I highly recommend it!
Images in this review
- Reviewed in the United States on March 14, 2025
- Reviewed in the United States on December 12, 2024
- Reviewed in the United States on September 2, 2022
- Reviewed in the United States on April 25, 2025
- Reviewed in the United States on August 7, 2022
Top reviews from other countries
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Artur MReviewed in Poland on November 13, 2021
Mały ale byk ( wariat )
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 usłyszyArtur MMały ale byk ( wariat )
Reviewed in Poland on November 13, 2021
Images in this review
- marex77Reviewed in India on March 25, 2024
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.marex77Works Good
Reviewed in India on March 25, 2024
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.
Images in this review
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