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Fosi Audio

Fosi Audio BT20A-S Bluetooth 5.0 Stereo Audio 2 Channel Amplifier Receiver Mini Hi-Fi Class D Integrated Amp 2.0 CH for Home Speakers 100W x 2 with Bass and Treble Control TPA3116 (with Power Supply)

    • Based on 567 reviews
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Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, Nov 22
Order within 17 hours and 36 minutes
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Features

  • Simple compact design but practical and powerful, little Hi-Fi Bluetooth wireless amplifier exclusively designed for the customers who pursue HiFi sound.
  • Bluetooth 5.0 core, up to 50ft connection range guarantees low signal delay. No pop, no audible noise when Bluetooth connection is established.
  • BT20A-S Bluetooth stereo receiver amplifier adopts 2PCS Texas Instruments TPA3116D2 chip. The TPA3116D2 are stereo efficient and digital amplifier power stage for driving speakers, with advanced oscillator/PLL circuit employs a multiple switching frequency option to avoid AM interferences.
  • 100W RMS X 2(4 ohms, 20 Hz - 20 kHz, 0.04% THD), comes with a 24V power supply, can drive 280watts(8 ohms), 320watts(4 ohms) speakers.(for passive speakers only, not the powered speakers).
  • Advanced circuitry design, built-in speakers protection circuit, best for bookshelf/computer/desktop/speakers in your home.

Product Dimensions: 5.2 x 3.54 x 1.42 inches


Item Weight: 1.5 pounds


Item model number: BT20A-S


Date First Available: July 27, 2020


Manufacturer: Fosi Audio


Country of Origin: China


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Nov 22

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Overall - Great little amp.
I just hooked up the Fosi BT20-S I bought and received today. I am quite happy and surprised with this little amp. I wasn't expecting it to have enough power to run my Klipsch KB 1.1 speakers, but it does and very handily. I also was surprised at how good it sounded. I didn't expect such good sound from a class-D amp. I didn't rate the Blue Tooth because I don't use BT., but I bought this one because it was the same price as the BT equipped and maybe one day I'll use that feature. I am very pleased. ... show more
Reviewed in the United States on October 16, 2023 by Bob Edwards
    • Amazing product!
Excellent product. Very good sound, with deep bass and bright treble. No noise even at maximum volume. Good quality overall. The connection is very simple and fast. Only low point is that it does not require a code or password to connect. Anyone can take control of the audio at any time.
Reviewed in the United States on October 12, 2023 by Francisco Borquez
    • Exactly what I had in mind ... Small, but powerful ... Excellent sound and function.
Except for those aspects of long term quality that only time will reveal I can make a long story short and just say go ahead and purchase this device. I love the sound generated by this device. I am very happy with this purchase. I needed to find a replacement / alternative for a RIP old school (18 years / Panasonic) receiver that was serving double duty for music and home theatre. The Panasonic was driving 2 quality front speakers and a decent center speaker in a 12 X 20 room. Overall the sound quality was very good with the exception of dialog for some movies and TV shows. While exploring alternatives for a replacement receiver and possible upgrade for the center speaker I became aware of a mini Bluetooth Amplifier as a possible alternative for music. I did look at full sized A/V receivers, but eventually decided on a sound bar for home theatre and this amplifier for my orphan speakers. The almost 2 decade longevity of the previous device left me unfamiliar with current offerings, but I envisioned and expected something compact and powerful with Bluetooth and connectivity for a wired device like my IPOD. On my second try I came across the FOSI BT20A-S mini Bluetooth Amplifier. I love the sound generated by this device. I am very happy with this purchase. When I connected this amp I was very pleased. The sound was exceptional and especially impressive to me as previous experience had only been with devices that were so much larger. There are pro and con debates over the merits of different classes of amps as well as the quality of digital music; I can only say that with a quality set of speakers the music originating from my phone and passing through this amplifier via Bluetooth was excellent. Same for IPOD via wired Line-In. With no active source there is no sound from the speakers at all. When turned up louder than I will ever listen to it (12 X 20 room) there was no distortion and no cut out. I listened to a range of different music genres as well as spoken word podcasts. I love this amplifier and was very pleasantly surprised that this tiny device at this relatively low price could deliver such a satisfying experience. I found a video review of this device where the reviewer opened the case to appraise the components inside (he pointed out Texas Instruments and Qualcomm) and to highlight that the amplifier chips were under a heat sink that was very much larger than the chip itself. This is key as the 1st amplifier I tried (one of the 'also very small white oval front red aluminum body' ones) had a heat sink only just covering the chip and the device became so hot I could not touch it and it was returned despite also generating excellent sound. In the video review of this Fosi amp the reviewer was concerned about heat from such a small and powerful device and measured the temperature (inside and out / before operation and after an hour) with moderate change in temperature and well within the published specifications of the chip. Again completely satisfied with the sound I would only say this second one is not quite as loud at max volume as the one I returned (but plenty loud.) I am at an age where clarity is more important than volume and in that context IMO the volume at about 60% is more than enough for my room and would easily suffice for an open room double the size. Most importantly to me after having to return the first device was that after playing for 2 hours at a volume higher than I need the case was just the slightest bit warmer than when I first turned it on. ... show more
Reviewed in the United States on March 8, 2021 by Brian
    • Bueno
Como enlasador bluetooth
Reviewed in the United States on October 7, 2023 by Buen receptor y aplicador de dos canales para equipos que no tienen bluetooth da un buen sonido . Estoy satisfecho con la compra. ARA.
    • Issues with record playing
This is an excellent little amplifier/receiver for multi-purpose use. I was using it with a new record player. The records sounded a little too fast and slightly off. I thought it was the record player, so I adjusted the speed and everything, but the problem continued. It was a vey subtle issue, but I definitely noticed it. I finally found an old receiver to test the player with and the records sounded good/normal. That leads me to believe that the digital processor in this receiver may not be a great fit with an analog record player. Something is off when that analog signal is converted digitally. Otherwise, it’s a great product for other amplification purposes. ... show more
Reviewed in the United States on September 22, 2023 by CMT
    • Sounds great
I have been using this amp for a few months and it is easy to use, Bluetooth is easy to connect, and overall the amp sounds great. I have it connected to two speakers. It is also very small I have a small mount on the back of the tv the amp is zip tied to. Great purchase and I would recommend.
Reviewed in the United States on August 1, 2023 by Sil
    • Sounds great
I’m running outdoor definitive technologies speakers and they are a great match for this little amp. Honestly, it sounds as good as my expensive, but older, Yamaha home theater receiver. Loud and very clear sound. Bluetooth makes it perfect for parties. For the price, you can’t go wrong.
Reviewed in the United States on July 22, 2023 by Dave
    • Functional but weak
Not the most expensive audio amp in this class, but frankly has some short comings. If you need Bluetooth connectivity this amp seems to connect flawlessly. To be honest, other than connecting and trying Bluetooth with an iPhone 12, a 2017 iMac and a 2020 Macbook Air M1, I did not use it long term via Bluetooth. That said, here are the issues I encountered with this amp. My basic setup is I have the audio out from a desktop PC to the amp. The output is to a pair of rather high-end Nanostat brand somewhat mini sized desktop/shelf speaker. All connections are wired. The speakers are somewhat old (I have 5 of them) that came with a Denon stereo receiver I purchased in the mid 90's. These small dual speakers come in an all-metal (tri-hederal shaped) patented enclosure and operate over a 2 to 8 Ohm range. They have excellent sound range and quality. The amp seems to have low power output and to bring the sound output to a reasonable power level I have to set the amp output volume to at least 50% and crank the computer output up to roughly 30% or higher. From time to time the amp produces a noticeable background noise. The bass and treble controls and kind of meh. They seem to have little to no effect on the audio other than when they are turned all the way up. Unfortunately, the lows become muddled, and the highs are way too sharp. The overall unit is quite small and runs warm all the time. There are no vent holes in the amp and its completely sealed. Surprisingly the power supply is quite large nearly double the size of the amp. The labeling is quite small and almost non-legible. In the on-line photos the amp's finish looks quite smooth like typical Apple products, but the finish is actually fairly rough, sandblast-type finish. Overall, I'm somewhat disappointed in this amp primarily in its power output and sound quality. ... show more
Reviewed in the United States on August 7, 2022 by lazerbeam

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