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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
Item dimensions L x W x H | 13.2 x 9 x 3.6 Centimetres |
Manufacturer | Shenzhen Foresight Technology Co., Ltd. |
Mounting type | Surface Mount |
Brand | Fosi Audio |
Number of channels | 2 |
Output power | 200 Watts |
Package type | bare |
Material | Plastic |
About this item
- 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
Product details
- Product Dimensions : 13.21 x 8.99 x 3.61 cm; 680.39 g
- Date First Available : Nov. 29 2024
- Manufacturer : Shenzhen Foresight Technology Co., Ltd.
- Place of Business : 3rd Floor, Building 10, Aohua Industrial Zone, Gaofeng Community, Dalang Street, Longhua District, Shenzhen 518000 China
- ASIN : B0DP95N7T1
- Item model number : BT20A
- Country of origin : China
- 鶹 Rank: #3,109 in Electronics (See Top 100 in Electronics)
- #10 in Audio Component Amplifiers
- Customer Reviews:
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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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Fosi Audio V3
TPA3255 Class D Home Audio Mini Speaker 2 Channel Amp 300 Watts x2
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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With a Nice Consistent Resistance
Fine-tune your sound with the smooth bass and treble adjustment for optimal speaker performance.
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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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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.
More details about the BT20A amplifier for potential assistance:
- If you're seeking the upgraded version of the BT20A, please consider the BT20A Pro amplifier.
- The BT20A amplifier is designed for a 2.0-channel audio system and is not intended for a 4-channel system.
- Generally, it is not recommended to use a turntable with the BT20A amplifier unless your turntable is with a built-in phono preamp.
- In terms of accessories, a set of 24V/4.5A power cables and an instruction manual will be provided. Note: Remote control and extra cables are not included.
Comparison
![]() BT20A | ![]() BT10A | ![]() BT20A PRO | ![]() BT30D | ![]() BT30D PRO | |
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Customer Reviews
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4.2 out of 5 stars 23
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4.7 out of 5 stars 5
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4.5 out of 5 stars 33
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4.2 out of 5 stars 24
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4.6 out of 5 stars 17
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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 |
MAX Power Output
| 100W x 2 | 50W x 2 | 300W x 2 | 50W x 2+100W | 165×2+350 |
Input
| Bluetooth + RCA | Bluetooth + 3.5mm AUX | Bluetooth + RCA | Bluetooth + RCA | Bluetooth + RCA |
Output
| Passive Speakers | Passive Speakers | Passive Speakers+Pre-Out | Passive SPK+Active/Passive Sub | Passive/Active Speakers/Sub |
Treble & Bass Control
| ✔ | ✔ | ✔ | ✔ | ✔ |
THD
| ≤ 0.04% | ≤ 0.04% | ≤ 0.005% | ≤ 0.04% | ≤ 0.3% |
SNR
| ≥ 98dB | ≥ 98dB | ≥108 | ≥ 98dB | ≥ 108dB |
Terminating Impedance
| 2-8 Ohm | 2-8 Ohm | 2-8 Ohm | 2-8 Ohm | 2-8 Ohm |
Power Adapter
| 24V/4.5A | 19V/4.74A | 32V/5A | 24V/4.5A | 32V/5A |
Work Voltage
| AC 110V - 240V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V |
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Customer reviews
Customers say
Customers are satisfied with the performance and sound quality of the electronic component amplifier. They mention it works better than they hoped for and sounds excellent for the price.
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Customers are satisfied with the performance of the product. They mention it works better than they hoped for and is excellent for the price. Customers also say it works great with outdoor Yamaha speakers.
"Very little amplifier but sounds great.working great with outdoor Yamaha speakers" Read more
"Works excellent for the price" Read more
"Worked great for about 3 weeks, then started cutting and in and out. Unfortunate. Had high hopes, especially since the price was adequate." Read more
"Works better than I hoped for...." Read more
Customers are satisfied with the sound quality of the product. They mention they've never had such excellent sound come out of those speakers.
"...or this one is awesome but I can confirm that I've never had such excellent sound come out of those speakers...." Read more
"Very little amplifier but sounds great.working great with outdoor Yamaha speakers" Read more
"This thing has a kick. Amazed by the power and quality of the sound...." Read more
"I have this coupled with a Fluance pre-amp and it sounds great with two Paradigm speakers through a Fluance RT 85 Turntable...." Read more
Reviews with images

Works better than I hoped for.
Top reviews from Canada
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- Reviewed in Canada on June 12, 2025Verified PurchaseI have speakers in the ceiling (3 pairs) over the kitchen, dining area, and formal dining room. I had wired it up when our house was being built. All the wiring ends up coming out of a wall-socket in the family room and I had them plugged in to an AM/FM/RCA-in amplifier...A little old but of decent quality.
We got tired of constantly searching for the appropriate adaptor cables depending on who's phone we were using so I ordered this little unit because of the bluetooth option.
I fired it up yesterday and wasn't expecting much because of the size and price. I SEAMLESSLY connected an iPhone and either my previous unit was terrible or this one is awesome but I can confirm that I've never had such excellent sound come out of those speakers.
I can't speak for longevity but at this price, I almost don’t care. 👍 👍 👍
- Reviewed in Canada on July 7, 2025Verified PurchaseThis is the best little Bluetooth system I have ever experienced, You can't go wrong if you purchase this unit.
- Reviewed in Canada on July 2, 2025Verified PurchaseVery little amplifier but sounds great.working great with outdoor Yamaha speakers
- Reviewed in Canada on July 7, 2025Verified PurchaseGreat mini amp.
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Reviewed in Canada on June 19, 2025Verified PurchaseIl manque le cordon d'alimentation...
- Reviewed in Canada on June 20, 2025Verified PurchaseI use this for two Dayton bs2s on iracing. It work much better than with the nobsound mini that I use for two Dayton tt25 -8
- Reviewed in Canada on May 15, 2025Verified PurchaseCan’t say enough good things about this little amp. Powerful and with Bluetooth along with rca inputs this little Fosi is very versatile. I bought one for my patio system and liked it do much I bought another for my performance synth setup. Besides the fact that it arrived in less than four days, it’s a very good buy.
- Reviewed in Canada on May 29, 2025Verified PurchaseThis thing has a kick. Amazed by the power and quality of the sound. The drawbacks I found are that you can not select the input to use, Bluetooth always has priority and since there is no pairing code for the Bluetooth anyone can connect to it, seller suggested I remove the antenna to prevent anyone else from connecting to the Bluetooth 😕 this would also reduce the range you have for streaming your own music.
When streaming via Bluetooth, the volume knob overrides the Bluetooth volume request and you can't increase the volume more than what the volume knob is set at, this requires you to walk to the unit and manually increase the volume.