Fosi Audio BT20A Pro 300W x2 TPA3255 Bluetooth 5.0 Home Audio Stereo 2 Channel Amplifier Receiver Mini Hi-Fi Class D Upgraded Integrated Amp for Speakers with Bass Treble Control


  • TI TPA3255 Chip Amplifier with 300 Watts x 2 Power Output: Advanced feedback design and high-speed gate driver error correction for efficient and high-quality audio performance, with low idle losses of
  • Upgraded High-Efficiency:  A significant upgrade from the BT20A amplifier with replaceable Op-Amps for customized. You can replace the two plug-in NE5532 Op-Amps with LME49720HA/MUSES02/OPA2604AP/OPA2134PA/LM4562/NJM4556AD Op-Amps to achieve a unique sound quality. With SNR≥108dB and THD≤0.005%.
  • Enhanced Bluetooth 5.0 Connectivity: The Bluetooth pair can be cleared by pressing and holding the volume control for five seconds. In addition, it has a memory Function for Easy Pairing and Alert Tone.
  • Customizable Sound with a Wide Range of Bass and Treble Controls: The BT20A Pro home audio amplifier offers a unique design for sound control. Enjoy original sound without effects by setting treble and bass effects to the middle point.
  • What you Get: BT20A Pro Power Amplifier x1, Bluetooth Antenna x1, 32V 5A Power Adapter x1, AC Cord x1, User Manual x1, our worry-free 24-month warranty, and friendly customer service.
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SKU: 34A23D94 Category: Tag:

Additional information

Is discontinued by manufacturer


Product Dimensions

12.7 x 12.7 x 2.54 cm, 1.1 Kilograms

Date First Available

23 Oct. 2018


Fosi Audio

Item model number


Country of origin


Guaranteed software updates until


Average Rating


( 8 Reviews )
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4 Star
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8 Reviews For This Product

  1. 08

    by Rusty

    I bought this to replace an older and much larger amplifier. The size difference made me question whether the sound would be as good, but I was pleasantly surprised. The Bluetooth connection works well.

  2. 08

    by Francisco

    – Drives my 100W speakers beautifully
    – A very discrete unit, fits in the palm of your hand
    – Easy to plug in and conceal if necessary
    – The case has a really good feel to it
    – Nice design and smooth corners
    – Has subwoofer connection to add bass should your speakers/setup require
    – Bluetooth connectivity excellent even when going downstairs with mobile in pocket (2-floor house)
    – Being able to disconnect the paired bluetooth device is a brilliant idea
    – Blue LED showing Bluetooth is paired
    – Red LED showing power on
    – Power adaptor has perfectly acceptable size
    – Midpoint knobs for treble and bass, allowing setting these at zero (brilliant feature)
    – Bass and treble controls produce excellent results in sound
    – Red volume knob of larger size
    – I’m sure there are many technical reasons why this is an excellent unit

    – I do not have any issues with this product.

    – Provide rubber feet to install the unit vertically on its side (however anyone can get their own rubber feet or even velcro straps/adhesive velcro straps therefore

    It’s hard to think what else could be improved with this product (maybe create 10 or 15 case colours to suit the needs of customers whose audio setups need to sound as good as they look).

    I’ll get rid of my Cambridge Audio amplifier as soon as I can because it’s simply no longer necessary to have something of that size to drive my audio needs.

  3. 08

    by Scobio

    I bought this because of the good reviews on audiosciencereview and it doesn’t disappoint. It is smaller than expected, but that is hardly a downside. Volume control is great and tone controls are nice when listening at low volume levels.
    Please note that this comes with the 32V power supply. If you need more power you should search for the 48V version.

  4. 08

    by Mrs. R. Clark

    Lovely design, clean sound with lots of power.
    I would have given this item aa 5, but the style of volume knob the company uses has quite alot of play in it, ie movement.
    I have contacted the company, and have been assured this is normal, yet I feel this could have been a perfect product if it wasn’t for this niggle.
    I’m not nit picking, as an internet search will reveal others who have mentioned this issue also.
    So it’s a 4 from me.

  5. 08

    by Laurent

    Many great reviews but I was still skeptical. Decided to get it anyways since my Samsung mini-hifi system died and I had nothing for my PC sound other than headphones which after a few hours of use become uncomfortable no matter how good they are.

    Connected it to the line out on my Sound Blaster G6 and with a few tweaks reused the mini hi-fi speakers and it does a really great job powering them, uses a lot less space on my desk than the mini hi-fi system did and the simple physical bass/treble knobs really help in quickly tweaking the sound on-the-fly rather than having to load up the Sound Blaster app and play with the equalizer.

    I tested bluetooth too and it works well, I haven’t observed almost any lag when streaming/stopping streaming but beware lack of security. Anyone in proximity of the amp can connect to it and it interrupts the other playback (line-in). I live in a house and can’t see my neighbors connecting to it but I’d be concerned if I were in an apartment building.

  6. 08

    by Francisco

    I’m very pleased with the build and sound quality of this amp. It forms part of a sound system in my office and provides more than enough power and clarity to over power the room I’m in.

  7. 08

    by R. W. Tibbitts

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     Overall this is a very competant class D amplifier . Unfortunately I purchased this in July during Prime Day offers. I think that it may have been returned or refurbished as the antenna was already connected and the packaging inside seemed to have been disturbed. I have since found an annoying warble/hiss coming from the treble control which suddenly stops at the three quarters past point. This happens even with the volume control set to zero and nothing else switched on in the system other than having speakers connected. I have reported this to Fosi who are currently looking into this….I hope they sort it out as other than this apparent fault and the fact that Amazon seems to have offered a refurbished or used item, the amp is really good. Turn volume up on video attached to hear the fault.
    Fosi have addressed my issue with this amp very promptly and have sent me a replacement within days. The new amp sounds great and I am very impressed with Fosi and their support for their products. Well done Fosi! Very happy!

  8. 08

    by Jeannie

    First up I am not a HiFi buff. But to my mind the sound is great, easy to connect to blue tooth, can have your Alexa connected without any issues using the blue tooth and takes up zero space. It replaced a stack system, of which we were pretty much just using the amp part. Best £100 I have spent in a long time.

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Fosi Audio BT20A Pro 300W x2 TPA3255 Bluetooth 5.0 Home Audio Stereo 2 Channel Amplifier Receiver Mini Hi-Fi Class D Upgraded Integrated Amp for Speakers with Bass Treble Control


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