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Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers

4.5 4.5 out of 5 stars 8,843 ratings
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BT20A-Black
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Purchase options and add-ons

Item dimensions L x W x H 13.2 x 9 x 3.6 centimetres
Voltage 230 Volts
Manufacturer Fosi Audio
Maximum supply voltage 24 Volts
Minimum supply voltage 24 Volts

About this item

  • 【Bluetooth 5.0】Featuring an integrated Bluetooth ATS2853 chip, this bluetooth amplifier supports streaming up to 50ft (15m). Effortlessly connect via Bluetooth to enjoy high-quality music from MP3, Phone, Pad, PC, or Laptop, embracing the wireless era.
  • 【Compact Design】Our mini amplifier offers a sturdy, space-saving design for home, office, or outdoor use. Elevate your audio experience with bass and treble controls to tweak settings as needed.
  • 【Immersive Audio Quality】Elevate your audio environment with room-filling sound, driven by a total output of 100W x 2 at 4 ohms. Covering a wide frequency range of 20Hz - 20kHz with less than 0.04% THD, achieve the perfect balance of volume and detail for an unparalleled home entertainment experience.
  • 【Superior Sound】Utilizing 2 integrated Classic TI TPA3116D2 chips, this device provides crisp, clean sound with crystal-clear highs and smooth, pure bass. It enhances voice clarity and speaker performance while maintaining lower energy consumption.
  • 【 Exquisite Craftsmanship】This power amplifier comes nicely packaged with a solid feel to the case and the controls and connectors. The all-metal body ensures durability, and you can enjoy the peace of mind provided by Fosi Audio's 24-month warranty.

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This item: Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers
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Product Description

Fosi Audio BT20A Bluetooth Amplifier Mini HiFi Stereo Integrated Amp
Stream Hi-Fi Music to Your Stereo System

Bluetooth 5.0 Mini Power Amplifier

Fosi Audio was founded with a simple goal: Build products that sound great and make people want to listen to music every day. We design and have many Hi-Fi audio products on the market. We pursue your perfect music journey. Enjoy Hi-Fi music with Fosi Audio products.

Fosi Audio BT20A Bluetooth Amplifier Mini HiFi Stereo Integrated Amp
Product Parameters

2.0 Channel Bluetooth 5.0 Stereo Power Amplifier

  • Power Adapter: 24V/4.5A, DC Input Range: 12-24V
  • MAX Power Output: 100W x 2, Terminating Impedance: 2 Ohm - 8 Ohm
  • THD ≤ 0.04%, SNR ≥ 98dB, Input Sensitivity ≤ 280mV
  • Frequency Range: 20Hz - 20kHz (±1 dB), Input Mode: Bluetooth and RCA
  • Bluetooth Transmission Distance: Up to 50 Ft

Fosi Audio BT20A Bluetooth Amplifier Mini HiFi Stereo Integrated Amp

Safe DC Outlet

With a built-in power protection circuit, there are no sparks flying when you plug the power adapter into the amplifier. Safe for use!

Fosi Audio BT20A Bluetooth Amplifier Mini HiFi Stereo Integrated Amp

24V/4.5A Power Supply

Fosi Audio BT20A equip with an energy-efficient and stable power supply can get an astonishing sound.

Fosi Audio Amplifiers Comparison

BT20A

BT20A

BT20A PRO

BT20A PRO

BT30D

BT30D

BT30D PRO

BT30D PRO

MC101

MC101

V3

V3

TB10D

TB10D

Customer Reviews
4.5 out of 5 stars
8,843
4.5 out of 5 stars
1,515
4.3 out of 5 stars
2,525
4.4 out of 5 stars
876
4.4 out of 5 stars
238
4.4 out of 5 stars
837
4.5 out of 5 stars
1,056
Price
£79.99 £109.99 £99.99 £119.99 £99.99 £71.99
Type
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 2.0 CH Amp 2.0 CH Amp
MAX Power Output
100W x 2 300W x 2 50W x 2+100W 165W × 2+350W 100W x 2 300W x 2 300W x 2
Input
Bluetooth + RCA Bluetooth + RCA Bluetooth + RCA Bluetooth + RCA Bluetooth + RCA RCA RCA
Output
Passive Speakers Passive Speakers + Pre-out Passive Speakers+Subwoofer Passive/Active Speakers+Sub Passive Speakers + Pre-out Passive Speakers +Pre-out Passive Speakers
Treble & Bass Control
THD
≤ 0.04% ≤ 0.03% ≤ 0.04% ≤ 0.03% ≤ 0.03% ≤ 0.003% ≤ 0.3%
SNR
≥ 98dB ≥ 108dB ≥ 98dB ≥ 108dB ≥ 100dB ≥ 110dB ≥ 90dB
Power Adapter
24V/4.5A 32V/5A 24V/4.5A 32V/5A 24V/4.5A 32V/5A 32V/5A

Compare with similar items

This item
Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers
Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers
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Price£79.99£69.99£89.99-20% £71.99
Was:£89.99
-13% £69.99
RRP:£79.99
£119.99
Delivery
Get it as soon as Sunday, Jan 26
Get it as soon as Wednesday, Jan 8
Get it as soon as Wednesday, Jan 8
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Customer Ratings
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Product guides and documents

Product details

  • Is discontinued by manufacturer ‏ : ‎ No
  • Language ‏ : ‎ English
  • Product Dimensions ‏ : ‎ 13.21 x 8.99 x 3.61 cm; 680.39 g
  • Date First Available ‏ : ‎ 10 July 2017
  • Manufacturer ‏ : ‎ Fosi Audio
  • ASIN ‏ : ‎ B07BQC7GNL
  • Item model number ‏ : ‎ BT20A
  • Country of origin ‏ : ‎ China
  • Guaranteed software updates until ‏ : ‎ unknown
  • Customer reviews:
    4.5 4.5 out of 5 stars 8,843 ratings

Customer reviews

4.5 out of 5 stars
8,843 global ratings

Review this product

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Customers say

Customers appreciate the sound quality, Bluetooth connectivity, and power of the electronic component amplifier. They find it has enough grunt to drive decent bookshelf speakers and ceiling speakers. The Bluetooth connection works seamlessly and is easy for them to use. Many consider it an excellent budget amp with a compact size.

AI-generated from the text of customer reviews

251 customers mention ‘Sound quality’208 positive43 negative

Customers appreciate the sound quality of the product. They say it has enough power to drive floor-standing speakers, and it delivers clean, detailed, and powerful sound. The volume is impressive, and the warm tone complements modern rooms well.

"...I use it mainly with a CD player and the sound quality is superb and certainly loud enough. Using it for streaming over Bluetooth is also excellent...." Read more

"...The sound quality has plenty of presence and is not remotely tinny or restricted, which I'd feared with such a little machine...." Read more

"...In use with some old Bose speakers it produces a warm tone in a modern room with nothing to absorb the sounds (so it could be a bit harsh)...." Read more

"It's tiny. Smart looking. Even The Missus likes it! Sounds good too. My first Class D amplifier and I'm so impressed. Runs cold too...." Read more

194 customers mention ‘Bluetooth connectivity’147 positive47 negative

Customers appreciate the Bluetooth connectivity of the product. They say it works seamlessly, the audio quality is about on par with direct RCA, and the range and quality are pretty good. The Bluetooth connection is easy, doesn't require a pin, and won't auto connect if you forget.

"...Using it for streaming over Bluetooth is also excellent. The only downside is that I find the volume etc controls a bit small and fiddly to adjust...." Read more

"...Bluetooth works seamlessly, and the audio quality is about on par with direct RCA connection...." Read more

"...in an adjacent room which I can now listen via the excellent reliable Bluetooth connection...." Read more

"...Sometimes I listen to things from my phone and the bluetooth is 100% reliable; it has never once gone off or distorted the sound...." Read more

112 customers mention ‘Power’105 positive7 negative

Customers appreciate the amplifier's power. They find it has enough power to drive bookshelf speakers and ceiling speakers. The amp performs well, exceeding expectations. Some say it's a brilliant little amplifier that sounds great with the Rega Planar 1 Plus and floor standing speakers.

"...That too is an excellent amplifier and I have reviewed it separately...." Read more

"...Clear and sharp, the amp performed over my expectations and I am very happy with it." Read more

"...It's astonishing. It has plenty of power, and its treble and bass controls are very useful - my old amp didn't have those - as I listen to old..." Read more

"This is the perfect answer for powering hifi speakers with a physically small amplifier. I have had this for two years now, and it is faultless...." Read more

87 customers mention ‘Compact size’70 positive17 negative

Customers appreciate the compact size of the amplifier. They find it easy to fit in small spaces and mention it fits in one hand. The amp has good build quality, a separate power supply that stays cool to the touch, and Bluetooth connectivity.

"...It is certainly a small amplifier and ideal for anyone with limited space. It has metal casing and feels very solidly built...." Read more

"This is the perfect answer for powering hifi speakers with a physically small amplifier. I have had this for two years now, and it is faultless...." Read more

"It's tiny. Smart looking. Even The Missus likes it! Sounds good too. My first Class D amplifier and I'm so impressed. Runs cold too...." Read more

"...The unit is also very small (about 1/10 the size of the amp it replaced) but with the same output power...." Read more

85 customers mention ‘Value for money’85 positive0 negative

Customers appreciate the value for money of the product. They find it an excellent budget amp with good performance for its cost and size.

"...off so it was just over £70.00 and at that price I feel it to be very good value indeed...." Read more

"...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..." Read more

"...For the most part, I think this is an excellent budget amp. If I could, I would split the sound rating of the amp in two...." Read more

"...I found this amazing little piece of kit and thought, well, this is so cheap that even if it's not up to much it's better than half the music being..." Read more

71 customers mention ‘Quality’67 positive4 negative

Customers appreciate the compact and well-made product. They find it easy to set up and like its functional style. The amplifier produces good sound quality, making it an ideal bedroom setup with great stereo sound.

"...This is a brilliant idea and a mini-revolution in amp design...." Read more

"It's tiny. Smart looking. Even The Missus likes it! Sounds good too. My first Class D amplifier and I'm so impressed. Runs cold too...." Read more

"...The amp is made out of metal and rather nicely finished...." Read more

"Good product good communication from supplier recommend this product" Read more

66 customers mention ‘Build quality’60 positive6 negative

Customers appreciate the build quality of the product. They mention it's reliable, powerful, and simple to use. The pots are also very good, and the wiring is simple and neat without frayed ends that could short out or catch your fingers.

"...It has metal casing and feels very solidly built. This gives me confidence as so many items seem flimsy these days...." Read more

"...Bass and Treble knobs good too - without over colouring the sound. Well built with good 4mm banana connectors - old school!..." Read more

"The amp feels premium with a nice solid all metal finish and it drove my speakers (2x 120w) very well but there is an audible fluctuating buzz..." Read more

"...I have no intention of testing the amp without a DAC. I believe a good quality DAC is absolutely essential for a good desktop sound system...." Read more

55 customers mention ‘Ease of use’55 positive0 negative

Customers find the amplifier easy to set up and connect with Bluetooth. The wiring is simple and neat, with no frayed ends. They enjoy the setup process and appreciate the detailed troubleshooting booklet. The amp is described as simple, unfussy, and does its job well.

"...phone went to Bluetooth settings and it was listed there, and paired right away. I set all the knobs at 12 o'clock and played some songs...." Read more

"...Reliable, powerful and simple to use. I can't recommend Fosi enough, and will definitely be considering them for any future electronic/AV needs." Read more

"Easy to connect and decent sound if you are using it only for listening...." Read more

"...This little Amp is really quick to setup and the sound quality is surprisingly good. Can't fault it at all. I am very happy with it." Read more

Great compact amplifier
5 out of 5 stars
Great compact amplifier
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.
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Top reviews from United Kingdom

  • Reviewed in the United Kingdom on 27 September 2023
    Colour Name: BT20A-BlackVerified Purchase
    I bought this on a whim and it has turned out to be an excellent purchase. I bought it with 15% off so it was just over £70.00 and at that price I feel it to be very good value indeed. It is certainly a small amplifier and ideal for anyone with limited space. It has metal casing and feels very solidly built. This gives me confidence as so many items seem flimsy these days. I use it mainly with a CD player and the sound quality is superb and certainly loud enough. Using it for streaming over Bluetooth is also excellent. The only downside is that I find the volume etc controls a bit small and fiddly to adjust. Not a major problem really but a remote would have been nice even if increasing the price slightly. I was so impressed with it that I also purchased a BL20A a few weeks ago. That too is an excellent amplifier and I have reviewed it separately. Overall I cannot fault Fosi products and would not hesitate to buy from them again.
    One person found this helpful
    Report
  • Reviewed in the United Kingdom on 14 May 2024
    Colour Name: BT20A-BlackVerified Purchase
    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.
    Customer image
    5.0 out of 5 stars Great compact amplifier
    Reviewed in the United Kingdom on 14 May 2024
    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.
    Images in this review
    Customer image
    Customer image
  • Reviewed in the United Kingdom on 8 January 2024
    I bought this to give some old 50w speakers a new life. For the most part, I think this is an excellent budget amp. If I could, I would split the sound rating of the amp in two. First I would give the amp 2.5 stars on the sound quality played through its Bluetooth connection. In this case, the sound is a bit muffled. I consider myself more of a casual listener but I was not overly impressed with what I was hearing. Although for some light listening or just randomly playing music from a device, I think the sound quality is passable for most cases. I would not use the speaker, amp, Bluetooth connection combo as an alternative for TV Bluetooth speakers. On the other hand the sound quality generated from the analogue input surprised me, which I would give 4.5. Clear and sharp, the amp performed over my expectations and I am very happy with it.
    One person found this helpful
    Report
  • Reviewed in the United Kingdom on 8 June 2021
    I had a Cambridge Audio amplifier, which has finally given up the ghost - annoying crackle and cut-out on one side of the stereo. It was driving me mad. I listen to classical music a lot. Looking around for a replacement stand-alone amp was proving costly - I have a brand new CA CD player and good CA bookshelf speakers which I didn't want to junk (which I'd have had to if I'd bought a self contained hi-fi system, which at first seemed the only option) Looking around on the net I found this amazing little piece of kit and thought, well, this is so cheap that even if it's not up to much it's better than half the music being cut off periodically by my dying CA amp, and I went for it. It's astonishing. It has plenty of power, and its treble and bass controls are very useful - my old amp didn't have those - as I listen to old recordings too which sometimes need a bit of bass boost or treble cut-back. I have a mass of music on MP3 files on a computer in an adjacent room which I can now listen via the excellent reliable Bluetooth connection. The CD player connected to the little amp works fabulously too. The sound quality has plenty of presence and is not remotely tinny or restricted, which I'd feared with such a little machine. This is a brilliant idea and a mini-revolution in amp design. The folks at Fosi have found a serious hole in the market and plugged it with a great range of innovative and smart kit. Very highly recommended!
    2 people found this helpful
    Report
  • Reviewed in the United Kingdom on 20 September 2023
    Colour Name: BT20A-BlackVerified Purchase
    This is the perfect answer for powering hifi speakers with a physically small amplifier. I have had this for two years now, and it is faultless. In use with some old Bose speakers it produces a warm tone in a modern room with nothing to absorb the sounds (so it could be a bit harsh). I tried a much more expensive amp, with a graphic equaliser, and the little Fosi is far better to listen to. Treble and base contols give any amount of tone adjustment. Sometimes I listen to things from my phone and the bluetooth is 100% reliable; it has never once gone off or distorted the sound. The amp switches itself from wired input to bluetooth as soon as you connect your bluetooth device, (there is no selector switch or anything like that). For the pc sound I am wired in. You have phono plugs for your input and banana plugs for the output, but for the output you could just have bare wire without plugs. You can see everything behind my computer screen, with a Bose speaker next to it. The speaker is 6½ cm wide, for scale. I can definitely recommend this amp.
    Customer image
    5.0 out of 5 stars Best thing I've bought for ages!
    Reviewed in the United Kingdom on 20 September 2023
    This is the perfect answer for powering hifi speakers with a physically small amplifier. I have had this for two years now, and it is faultless. In use with some old Bose speakers it produces a warm tone in a modern room with nothing to absorb the sounds (so it could be a bit harsh). I tried a much more expensive amp, with a graphic equaliser, and the little Fosi is far better to listen to. Treble and base contols give any amount of tone adjustment. Sometimes I listen to things from my phone and the bluetooth is 100% reliable; it has never once gone off or distorted the sound. The amp switches itself from wired input to bluetooth as soon as you connect your bluetooth device, (there is no selector switch or anything like that). For the pc sound I am wired in. You have phono plugs for your input and banana plugs for the output, but for the output you could just have bare wire without plugs. You can see everything behind my computer screen, with a Bose speaker next to it. The speaker is 6½ cm wide, for scale. I can definitely recommend this amp.
    Images in this review
    Customer image Customer image
    Customer imageCustomer image
    3 people found this helpful
    Report

Top reviews from other countries

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  • Trailbreaker
    5.0 out of 5 stars Crazy good for the price!
    Reviewed in the United States on 12 December 2024
    Colour Name: BT20A-BlackVerified Purchase
    Simple to hook to my bookshelfs (Wharfedale Diamonds) and Cambridge CD player. Amp is little; about the size of two packs of cigs. Excellent fit and finish. Doesn't have the punch of a 40 lb amp but presents the music very nicely. 25% volume is plenty for me; 33% is about max in the family room I have it set up in. Excels on simple music like Japanese flute, cello, guitar, vocals; gets a bit congested on hard rock and similar but I bought it for the former not the latter, and my bookshelfs do best with the same. Bluetooth connected instantly and sounds superb. I'm very pleased with this purchase.
  • Drlove
    5.0 out of 5 stars Great mix with Totem Acoustic Mite speakers
    Reviewed in Canada on 1 December 2024
    Colour Name: BT20A-BlackVerified Purchase
    I got this small amp because in bedroom I got a "cheap" chinese projector (1080p native) but audio is awful and very low. The bluetooth pairing works great and very quick without need to press any button. I had my mint Totem acoustic speakers laying since I moved last year so it was a perfect use. I dont listen very loud or hifi music in bedroom, only for movies/plex/youtube. But just a quick review to say that it is a legit good little amp, no static noise or pop,or anything bad. Would be the best if it had hdmi arc,i would have another use in others rooms and family.
  • geert
    5.0 out of 5 stars Great little Amp.
    Reviewed in Belgium on 23 December 2024
    Colour Name: BT20A-BlackVerified Purchase
    Great little Amp. Dies what it's supposed to do. Bluetooth connection was easy.
  • Alessandro
    5.0 out of 5 stars Sorprendente
    Reviewed in Italy on 21 November 2024
    Colour Name: BT20A-BlackVerified Purchase
    Sarà che va a pilotare delle polk xt15 ma l'amp conterà pure qualcosa nella qualità e per quanto è costato ha cambiato totalmente la prospettiva e le modalità di ascolto, potenza e qualità ad un prezzo accessibilissimo. Se come me siete entrati da poco nel mondo hi-fi non credo ci sia scelta migliore per iniziare.
  • Al
    5.0 out of 5 stars Perfect
    Reviewed in Saudi Arabia on 28 October 2024
    Colour Name: BT20A-BlackVerified Purchase
    Thanks