Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers

I have been using the Fosi Audio BT20A Pro for over one year with my Pioneer and Kenwood speakers, and it has been an excellent experience. The sound clarity is outstanding, with clean vocals, detailed mids, and crisp highs. The separate Bass and Treble controls are very useful, allowing me to fine-tune the sound according to my listening preferences and different music genres. The bass response is impressive when paired with capable speakers. It delivers deep, controlled bass, and for my setup, I don't feel the need for a separate subwoofer. The amplifier provides enough power while maintaining excellent clarity even at higher listening volumes. After one year of regular use, the amplifier has remained reliable and continues to perform flawlessly. Overall, the Fosi Audio BT20A Pro offers exceptional sound quality, useful tone controls, and excellent value for money. I highly recommend it to anyone looking for a compact, powerful stereo amplifier.

This is a honest review of FOSI BT20A PRO. After trying a few Inexpensive yet good class D amps, I decided to go for the fosi bt20a pro, as its based on Tpa3255 and has the bluetooth & rca connection options (till 6.months back there were too few BT amps from fosi or aiyima) Here is my review Build : Pretty solid, everything is upto the mark, the aluminium used high grade anodised one, no creaks and squeaks anywhere when you hold the amp. All the three knobs (bass treble and Volume) are sturdy but somehow the one I got had a kinna wobbly volume knob, dunno if it's just me or this is the way it is. The back connectors and sockets are placed pretty close to each other but with some small maneuvering everything can be pushed, tied and fixed. Accessories There comes a bluetooth antenna the standard one & decent enough, which you have to add yourself. POWER SUPPLY : the amp is rated to work from 24v to 48v power supply but is shipped with a Fosi branded 32V 5A one.. It does what is expected of it and the output is sufficient..(at lest fir my use case scenario is more than enough) The wire provided with the power supply adapter is of adequate length, the block and wires all look decent and feel study enough . Checked its voltage and it does produce what is claimed 32.4V to 32.5V. Functionality.. Bluetooth connects in a jiffy and the coverage is good. Kinna tricky sometimes to get the connection changed but by and large it's easy to switch from BT to RCA There is also a socket of 3.5mm pre out at the back which can be used to supply signals to an active subwoofer which is awesome in my view... But I don't think I ll ever need that because the amp giving enough thump already with the pair or my Sony passive speakers. This same socket can be used to connect this amplifier as a preamp to another amplifier if you want.. ONE VERY IMPORTANT THING : The amp comes with replaceable op amp chips, (which require the user to remove the screws and slide out the motherboard and then chnage the op amp chips) the more enthusiastic audiophiles who like to experiment with different sound signatures can change them according to their preference.. FOSI has suggested a number of op amp chips that one can try after purchasing them from market or from online.. (there a few available at Amazon India as well) In my personal view it is sounding pretty good as it is so for majority of users there is absolutely no need to experiment with the op amp chips. Audio quality Please note I use my SONY BOOKSHELF SPEAKERS with this.. The one which came with my Az2d music system they have a kind of plasticky cone hence the bass is pretty tight and I love that. Via Bluetooth it sounded pretty decent (please note I use Spotify with highest streaming audio quality on an iPhone) Through RCA I stream via my Google chromecast audio and the sound is fantastic. Over all its pretty loud, the tone knobs do a good job and the best part is there is a neutral point for both bass and Treble exactly in the center so you get a good reference point.. The low freq response is awesome which is genuinely deep and tight, the high freq are pretty good too but may be a bit more wanting like 10% lesser than the bass response... But that's just me... Over all it has played everything nicely that I have thrown at it... Mids are pretty good ( as you are to manage the mids via your preamp etc, you can further enhance them as well) Be it the jazz, or Bollywood music, or ghazals by Mehdi Hassan and Live Indian Classical renditions in both vocal and instrumental, it played everything nicely (of course you have to adjust the knobs according to the type of music as well as the source quality) Edit : after using for more than a month I can say the sound is pretty neutral and with a wide stage, the high frequencies need a tad extra kick for my liking so I am trying to arrange a preamp now to boost the quality further.. But one thing is for sure, via Google chromecast audio (which technically means that there is a proper DAC before the RCA input (as the GCA has a dedicated DAC in it) this thing just sounds so great.. Please note : type of drivers (speakers) plays another huge role so please use atleast half decent ones with these... All in all I am pretty happy, would have loved a fully functional remote and a knob to manage the mids too (I know that's tricky) Would have loved to have couple of more connectivity options like optical etc but I know I will never use them so doesn't matter, but having them would have been great even if just for academic purposes... In the end I can safely say that its a pretty good small package Would highly recommend it as tpa3255 chip perfoms extremely well and with its implementation on the fosi board it produces very loud audio without much distortion... There is no hissing or clicking when the amp is idle and it doesn't get hot (that much) as well.. Thanks

Pros: 1. No hissing or power on pop sound. 2. Mild heating, even after running for 5 hours 3. Well built and feels solid 4. Bluetooth connects properly and sound quality is good. 5. Bass cntrol and treble is also good. Treble works better than bass. 6. Size is small and does not occupy space. Can be kept on top of speaker. Cons 1. Amplification seems to be little less. Since the volumen control is lograthimic, you have to keep the knob greater than 60% to get a decent volume. Overall, value for money. I mostly listen to classical and old Hindi songs and the sound quality is good.

I have been thinking about setting up a music system that delivers amazing quality for a small space, especially for long listening sessions. Using in-ear pods for extended periods can be uncomfortable and potentially harmful to the ears, so I decided to repurpose some of my existing speakers that hadn’t been used in a while. My setup includes a MacBook Pro, connected via the 3.5mm jack to the Fosi BT20A Pro amplifier, driving Polk RTi FXi A6 surround speakers. I’ve chosen this configuration because the FXi A6 offers a frequency response that suits my needs perfectly. I primarily use Apple Music, streaming at 98 kHz, and the results have been impressive. To further enhance the audio quality and fully utilize Apple Music Hi-Res, I bought the Fosi DS1 DAC. After adding the DS1, the total listening experience became phenomenal. Thank you, Fosi, for such innovative products at such great prices. Need not spend lakhs of money to hear the same music. Design and Build Quality One of the first things you’ll notice about the Fosi BT20A Pro is its solid construction. The metal housing gives it a premium feel, and its compact size makes it easy to fit into any setup, whether on a desktop or as part of a larger home audio system. Sound Quality: The sound is clear and well-balanced, with a good sense of depth and detail. The amp does a great job of driving speakers to their full potential, delivering crisp highs, detailed mids, and punchy bass. With the addition of the Fosi DS1 DAC, the audio experience reaches new heights, fully capturing the richness of Apple Music’s Hi-Res offerings. Low Noise Floor: Even at higher volumes, the amp remains quiet, with no noticeable hum or hiss. This makes it a great choice for critical listening in quieter environments. Value for Money Given its price point, the Fosi BT20A Pro offers excellent value. It’s a budget-friendly option that doesn’t skimp on quality, making it an ideal choice for those looking to upgrade their audio system without breaking the bank. • Affordable: Considering the performance and build quality, the BT20A Pro is priced very competitively. It offers features and sound quality that you’d typically find in more expensive models. • Long-Term Investment: Thanks to its robust build and reliable performance, the BT20A Pro feels like a piece of equipment that will last, making it a sound investment for any audio enthusiast. Conclusion The Fosi BT20A Pro is a fantastic little amplifier that punches well above its weight. It offers great sound quality, versatile features, and solid build quality, all at an affordable price. Whether you’re a casual listener or an audiophile on a budget, this amp is sure to impress. With the addition of the Fosi DS1 DAC, the listening experience becomes exceptional, fully taking advantage of Hi-Res audio formats.

Best D-class amplifier. Amazing sound quality even from decades old speakers. Doesn't overheat like other amplifiers when played on high volume for a long period. Bluetooth connects very fast, it connects under a second, and the bluetooth range is very great as well, it doesn't disconnect even if there are multiple walls in between and the device is meters away. Knobs for volume, bass, treble are good. I personally like the toggle switch for on/off. Value for money? Indeed. If the speakers which are being connected to it have woofers, there is no need for separate active woofers, this handles them good and every frequency- high (in tweeters), mid (vocals in mid-freq. drivers), and lows (woofer- bass) are good and audible clearly.

I researched a lot beforing buying Fosi Audio BT20A Pro doing a lot of deep ChatGPT and Gemini AI based evaluation. I had two 80watt 25 years old speakers being used on Harman 120 watt Amplifier. During search, I got to know that it was Class AB. ChatGPT helped me dig much deeper into every technical aspect. Though I was wary about how my speakers will sound on Fosi BT20A Pro, however the decision to buy was band on. I could not believe my speakers may sound so crisp listening to minute instrumental details. Though the loudness has not been that great may be 60% of my Harman 120watt amp however it was very sharp and detailed at full volume as well. Please note I used Bluetooth with 32volt standard Fosi supply. Yes, I used it through my Mackie Profx10v3 through its earphone out and it was roaring with my dholak and 4 mics connection. I have yet to use the my sound mixer Main out as I did not have RCA In. I hope the sound output will further increase. Also, I am pondering to upgrade to 48 volt Fosi supply. With all combinations, if needed will upgrade speakers to match output. My full go ahead of you are wishing to buy a quality product.

Kitane watt out put hai yar isase to Mera fosi 50 watt Vala achha chalta hai yar

For me this amplifier work very well with my old speakers of SL3147 3in1 stereo player. Crisp and clear sound quality. Worth every penny spent on this amplifier . Cute and compact size

Ürünü fiyatına göre değerlendirmenin daha doğru olacağı kanısındayım. Dali Oberon 3 ile kullanıyorum. Boyutuna göre, gerek detay, gerek bas ve tiz performansı olarak memnunum. Hızlı ve sorunsuz teslimat için Amazon'a teşekkürler.

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It seems that I got a particularly broken unit, in which the Bluetooth module caused an annoying crackling and buzzing sounds. The manufacturer's support team was simply professional and I was positively surprised by the level of understanding and support I received.

Parto dal presupposto che sto esprimendo il mio parere in relazione ad un prodotto che ha un costo che definirei irrisorio in un contesto hi-fi. Non mi dilungo a descrivere le caratteristiche tecniche che chiunque può leggere ma vado direttamente al dunque come faccio di solito. Come suona? - Bene. Provato il collegamento Bluetooth sia con il mio Samsung s21 che con il mio iPad il suono in classe “d” si mantiene pieno fresco ed equilibrato. Lo stesso dicasi per il mio MacBook Pro 16 pollici e per il computer con sistema Windows. Sinceramente ho notato un suono più trasparente durante il collegamento con l’iPad di ultima generazione forse dovuta alla tipologia del dispositivo. La gamma media inizialmente deludente a volume basso esprime una sicurezza non comune appena si raggiungono i 3/4 del potenziometro. non vi aspettate una potenza di 300 watt bensì un volume assolutamente adeguato ad una stanza ed a un ascolto piacevole sia con casse da 8 che da 4 ohm. Merito probabilmente della tipologia di controllo del volume. La compattezza è il suo forte. Al tatto piacevole. I collegamenti mantengono quanto pubblicizzato. Semplicità ed immediatezza. Ho provato il collegamento in serie ad altro amplificatore per collegare 4 casse. Eccellente. Totale assenza di fruscio In sintesi un oggetto minimalista privo di telecomando, dac o ingresso cuffie ma efficiente, compatto e con un rapporto qualità /prezzo assolutamente al di sopra della media ed io ne ho provato veramente tanti. Non credo che con un budget così ridotto si posso trovare di meglio. Come già detto parliamo di un dispositivo con un costo sotto ai 100 euro non siamo al top dell’hifi. Il valore aggiunto, quello che però mi ha realmente sorpreso è stata la disponibilità del personale addetto della Fosi. Sempre pronto a rispondere alle domande e soddisfare esigenze. Naturalmente da consigliare. Ho intenzione di provare altre apparecchiature della stessa casa produttrice e non esiterò a fornire una pronta risposta. AGGIORNAMENTO Per mia curiosità musicale e mio desiderio di ricerca di verifica di quanto asserito dai venditori ho acquistato un alimentatore Fosi Audio Adattatore CC alimentatore GaN 48V 5A ed un paio di operazionali Sparkos SS3602 , quest'ultimi direttamente dal sito Fosi non essendo disponibili su Amazon. Sono rimasto sorpreso. Il primo impatto con l'alimentatore che fornisce una dinamica maggiore specialmente a fine corsa del volume, evidenzia solidità e garantisce una maggiore protezione. L'altra sorpresa l'ho avuto dopo avere montato i chip operazionali Sparkos. E' evidente che in tale maniera il costo non è più minimo bensì andiamo a quasi il triplo di quello del solo amplificatore però ne vale la pena. Nonostante le ridotte dimensioni il BT20A PRO regge il confronto con amplificatori più blasonati e sicuramente di dimensioni maggiori. Il montaggio dei chip è stato molto semplice. Basta seguire le istruzioni a video. Una difficoltà iniziale nel togliere i chip in dotazione fortemente ancorati ma agendo con decisione il tutto diventa molto semplice. Adesso devo solo aspettare l'uscita dello Z3 ... vediamo cosa viene fuori.

J’ai choisi ce ampli après avoir fait quelques recherches sur le net car je voulais pouvoir brancher mes enceintes extérieures et profiter de la musique dans le jardin et autour de la piscine. Franchement, je ne suis vraiment pas déçu de mon achat. L’ampli est compact, discret et ne prend pas beaucoup de place, mais il envoie largement ce qu’il faut pour mon utilisation. Je le connecte principalement en Bluetooth avec mon téléphone ce qui me permet de lancer facilement ma musique sans avoir besoin de câbles partout. La connexion se fait simplement et rapidement et une fois lancé, tout fonctionne très bien. Le rendu sonore est vraiment top. Pour une installation extérieure, je voulais quelque chose de propre, agréable et suffisamment puissant pour avoir un bon fond musical sans que ce soit agressif. Et là, c’est exactement ce que je recherchais. Quand tout le monde est dans la piscine avec une musique en fond, l’ambiance est parfaite. J’apprécie aussi beaucoup les réglages des basses et des aigus. Cela permet d’adapter le son selon le style de musique, l’endroit où l’on se trouve ou simplement selon ses préférences. On peut vraiment obtenir un rendu qui correspond à ce que l’on aime et c’est un vrai plus. À la maison, tout le monde est content. C’est devenu un petit élément indispensable pour profiter des beaux jours, des repas dehors ou des moments détente en famille. Pour sa taille, il fait vraiment très bien le travail et donne une belle impression de qualité. Très satisfait de cet ampli, simple à utiliser, efficace et avec un très bon son. Je le recommande sans hésiter pour ceux qui veulent alimenter des enceintes et profiter d’une bonne ambiance musicale à la maison ou en extérieur.