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Our Story
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, manufacture, and sell many Hi-Fi audio products on the market. We pursue your perfect music journey. Enjoy Hi-Fi music with Fosi Audio audio products!
2.1 CH Bluetooth 5.0 Stereo Amp
Product Parameters:
Input mode: U-disk/Bluetooth/RCA
Output mode: Powered subwoofer+ Passive Speakers
SNR: ≥98dB
THD: ≤0.05%
Working voltage: 19-35V
U-disk: USB 2.0, compatible with USB 3.0
U-disk capacity: MAX 32GB, no more than 100MB per file
Support format: MP3/WMA/APE/ FLAC/WAV
Max output power: 160 Watt×2 + powered subwoofer
- 2 Channel Power Amp: BT10A, BT20A, BT20A Pro, TB10A, TB10D, V1.0B, V1.0G, TDA7498E, ZK-1002, ZK-502T.
- 2.1 Channel Power Amp: BT30D, BT30D Pro, BL20A, BL20C, ZK-TB21.
- DAC: Q4, K5 Pro, DS1, DS2. DAC Amplifier: PH04, DA2120A, DA2120C.
- Subwoofer Amp: TP-02, M01-BT, M02, M03, M04.
- Phono Preamp: BOX X1, BOX X2, BOX X3, BOX X4. Tube Preamp: P1.
- Tube Headphone Amplifier: T20, T20X, P2.
- Class AB Amplifier: T3.
Mutiple Input Modes
Easily adjust your input mode with the BL20C audio amplifier's convenient input mode switch, which allows you to choose between U-disk, Bluetooth, and RCA inputs. With priority given to U-disk, followed by Bluetooth and RCA, BL20C ensures a seamless and tailored listening experience.
STMicroelectronics TDA7498E Chip
The BL20C audio amplifier provides powerful dual-channel stereo output with 160-W + 160-W power output at THD=10% with RL=4Ω and VCC=36V. It also features a 220-W mono parallel BTL output at THD=10% with RL=3Ω and VCC=36V, taking your audio experience to the next level.
Build 2.1 Channel Stereo System
Setting up a home stereo sound system with 2.1 amp BL20C is a breeze, as it can effortlessly connect with both passive speakers and a powered subwoofer. In just a few minutes, you can have a fully functional and immersive audio setup.
D. Hamilton
Reviewed in the United States on March 5, 2025
I ordered this unit based on multiple positive YouTube reviews. It arrived same day from Amazon, and properly packaged. It took literally 5 minutes to set it up. It connected/ paired to my Motorola cell phone's Bluetooth with no problems. The sound quality streaming YouTube Music via Bluetooth is excellent. The sound quality playing CDs through the RCA physical connection is much better than I have ever obtained using my 2000s era giant tuner amps. The sound was further enhanced adding Micca MB42X Gen 2 bookshelf speakers, and an older Aiwa subwoofer. I bought this amp partly because it is so compact so I guess I shouldn't complain that as a result there is not much space for connections on the rear. There is minimal space between the outputs to connect passive speakers, you have to be extremely careful to avoid the cable ends touching the wrong terminal. I solved this with a small piece of insulation tape on each connector.The only thing I "miss" is having a remote for volume and source control.As you can probably tell from my description I'm not an audiophile, I honestly don't understand what half the audiophile reviewers are even talking about. However I've been buying consumer quality and better stereo equipment for 50 years and I appreciate the quality of the product and sound that this little amp-that-could represents.
Paolo
Reviewed in Italy on September 28, 2024
Ho recuperato le mie vecchie Tannoy Reveal dopo venti anni, dopo aver ascoltato musica da piccoli device. La potenza è all'altezza, ma ascolto a volumi relativamente bassi. La qualità è comunque impressionante per un piccolo aggeggio. Equilibrato il suono, ed utili i controlli di bassi e alti per dare più chiarezza alle mie vecchie casse monitor da studio. Raccomandato.
Malik
Reviewed in the United Arab Emirates on August 17, 2024
Excellent purchase , got it at very good deal price . Bluetooth works fast and perfect . Very easy to install and pair .
michael
Reviewed in Spain on May 23, 2024
Tiene un buen sonido y mucha potencia
Prellin
Reviewed in Australia on February 4, 2024
I purchased this product about 18 months ago and recently it started having Bluetooth connection issues. I contacted the support team and we tried to diagnose what the problem is. Fosi eventually replaced the product under the warranty and shipment was quick. Thanks Fosi.
Shubedowop
Reviewed in the United States on April 24, 2024
Although I had watched many great reviews on this item, such things remain very subjective. I had fairly high expectations from the reviews, but still really didn't know what to expect. I was able to compare it to another popular budget brand unit in a similar price range. Although this other unit was built well and had a bunch of great features....in terms of sound and power...there was absolutely no comparison. I was amazed at the clean power and volume of the Fosi. I first ran it with Polk Mini Monitors which are small bookshelf speakers with 5.25 drivers. I just couldn't believe what I was getting out of those speakers. I then switched to a much larger set of floorstanding speakers with 8in drivers. Again... Just Blown away! This little Fosi had no problem driving them with great sounding bass, mid/high clarity and plenty of headroom. I honestly don't think I would ever have to turn this unit up beyond 12 o'clock. The Fosi is built well, the Bluetooth works great, I love the USB input, it sounds awesome and the price is more than right for what your getting. It's tiny and puts out good clean power. I wish I had some 3 way speakers with 12in drivers to test this on. In any regard, unless you need something highly specialized, this amp should make you very happy. I highly recommend this Fosi product!
Denisss
Reviewed in Germany on January 23, 2023
Für dieses Geld absolut zu empfehlen. Angeschlossen habe ich 2 ältere Denon Hifi Standspeaker. Ich bin froh diese noch benutzen zu können und liebe den Klang. Im vergleich zu einem Analog/Digitalen Verstärker für 1000€, was mir in etlichen Hifi Läden empfohlen wurde, bin ich froh nur 1/10 gezahlt zu haben, und trotzdem Bluetooth Verbindung zu haben, über Bässe und Mitten einstellen zu können, und einfach meine alte Anlage zu benutzen. Absolut zu empfehlen. Klein, verbraucht kein Platz und sieht super aus. Einfach zu empfehlen!
AJ
Reviewed in the United States on March 27, 2022
So to preface, I am not a speaker audiophile, but I do think I can hear differences at most quality levels of speakers. My current setup is meant to get the best bang for my buck ~ $300, with2 T15 Polk passive speakers + 1 PSW10 Polk Powered Subwoofer + Fosi Amp BL20CI was originally having an issue with stronger bass hitting songs with soft entries of bass and vocals. It required turning my devices audio output to max AND turning down the amp's dials for treble and bass. The amplifier for some reason (I'm not a speaker expert) would not allow for strong bass hits and entries of sound if the audio input wasn't maxed and the bass knob wasn't turned all the way down. I wish the amplifier would allow me to adjust treble and bass without compromising on its performance.Other than that, this amplifier does the job solidly, Bluetooth is strong and reliable so far, audio seems well balanced from my classical music to my rap beats, but requires tinkering on my devices output rather than the amplifier's settings.I highly recommend my setup as long as you don't expect to play around with bass and treble on your amplifier!!!
Uriah
Reviewed in the United States on September 14, 2018
This speaker amp works very well. I connected 2x 6ohm 120w speakers, and a 130w sub and they sound great.SUMMARY:I had a 5.1 surround sound system (2010 model) but the receiver died. The speakers I had for it connected through the bare speaker wire pinch connectors (no banana plugs or RCA). This amp had the connections I needed for those speakers. I bought some banana plugs to go with it to make the setup easier (I would recommend this). I'm no audio expert so I can't tell you how this would work as a DIY amp for an audiophile setup or how amazing the audio quality is compared to other products on the market. I can tell you that this was just about the ONLY 2.1 amp I could find for the speaker and sub that I had.Build quality simple and is not flashy; but it's solid and looks as the picture shows. It doesn't heat up like my old receiver did. It is pretty small so that could either be great, or not so great--so you decide. It's about the size of my hand.I WOULD recommend this amp.With that said the quality of sound is good for me. I just needed 2 speakers and a sub for my PC and this amp powers them just fine. It's rated up to 200w and 12ohm. I listen to music and watch videos using speakers, but I play all my games using a headset. The system gets pretty dang loud and so does the sub. (obviously compared to 5.1 it's not as powerful). You get the idea of why I got this though.Read the instructions first before you hook it up to your power. This comes with an AC-DC converter (much like your laptops) that is rated for 19v DC. Needless to say there is a lot of power initially going to the capacitors. So connect it to the amp, then the wall. Not vice a versa.
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