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
$9.99
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Product description
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. Bluetooth amp stereo Merchant Video
The upgraded version of Fosi Audio BT20A
Fosi Audio BT20A Pro 600W TPA3255 Bluetooth 2.0 CH Amplifier
Input: Bluetooth + RCA; Output: Passive Speakers + Pre-outTHD: ≤ 0.005%; SNR: ≥108dB; MAX Output Power: 300Wx2@4Ω （Using a 48V10A Power Supply）
*Note: It should be emphasized that 300W refers to the maximum power supported by the product’s chip, which can only be achieved with a 48V 10A power supply. The power supply’s voltage and current determine the amplifier’s maximum output. For more details, please refer to the illustration below on Power Variability.
Bluetooth Distance: ≥15m
Bluetooth Transmission Format: SBC/AAC
Note: The amp prioritizes Bluetooth and doesn’t support simultaneous RCA and Bluetooth input.
Unique Design for Sound Control
Experience the authentic sound without any added effects by adjusting them to their middle points.
Full-range Pre-Out Output
Easily connect to a powered subwoofer, speaker, or another amplifier for versatile audio options.
1 Bluetooth 5.0
2 Treble/Bass Control
3 PRE-OUT
1 Power Variability
2 Back Side
3 Front Side
Texas Instrument TPA3255 Chip
Has a unique smart algorithm that optimizes the output stage for max efficiency and min distortion.
Upgrade Audio Performance
Achieve a Distinct and Exceptional Sound Quality
The two plug-in NE5532 Op-Amps can be replaced by LME49720HA/MUSES02/OPA2134PA Op-Amps, etc.
High Precision and Stability Inductance Values
Low DC resistance and excellent frequency characteristics which improve performance
1 TPA3255 CHIP
2 Replaceable OP CHIP
3 High Power Inductors
Friendly Solutions Guide
1. Check Connections & Device Compatibility: (1)Ensure all audio cables are fully inserted and undamaged. Replace any frayed cables with high-quality shielded ones(recommended: cables with metal connectors). (2)Confirm your speakers’ power rating(e.g., 50W/100W) and impedance(e.g., 4Ω/8Ω) match the amplifier’s requirements(see product manual).(3)Avoid raising the volume beyond your speakers’ labeled maximum(e.g., “Max 80%”) to prevent distortion.
2. Optimize Setup & Audio Sources: (1)Speaker Upgrade: Use high-resolution speakers placed at least 30cm away from walls or corners. Add rugs or curtains to reduce echoes. (2) Audio Quality: Play lossless music formats(e.g., FLAC, WAV) on dedicated devices(e.g., music players or updated phones/computers).(3) EQ Adjustment: Reset the equalizer to the neutral(flat) position initially. Adjust bass/treble gradually(like adjustments to 50% of the scale).
3. Reduce Environmental Interference:
(1) Anti-Interference Cables: Use shielded RCA cables with grounding(metal-shell connectors) to minimize buzzing.
(2) Distance from Interference: Keep audio/Bluetooth cables ≥30cm away from routers, power outlets, or microwaves.
(3) Troubleshoot Sources: Test the same song on another phone/computer. If the noise persists, contact support for a replacement.
Note: This product is designed to prioritize Bluetooth over RCA when both are connected and doesn’t support dual-input playback simultaneously.
BT20A PRO
Comparison Chart
Bluetooth 2.0 CH Amp
Type
Bluetooth 4.1 CH Amp
300W x 2
MAX Power Output
30w*4+60W*1
Bluetooth + RCA
Input
BT + 3.5mm AUX + OPT
Passive SPK +Pre-out
Output
Pre-Out+SPK Out
Treble&Bass Control
≤ 0.005%
THD
≤ 0.03%
≥108dB
SNR
≥88dB
Bluetooth 2.0 CH Amp
Type
Bluetooth 2.1 CH Amp
300W x 2
MAX Power Output
165W x 2 + 350W @ 4Ω
Bluetooth + RCA
Input
BT+RCA+COA+OPT+USB
Passive SPK +Pre-out
Output
SPK/SUB/PRE OUT
Treble&Bass Control
≤ 0.005%
THD
≤0.03%
≥108dB
SNR
≥100dB
Bluetooth 2.0 CH Amp
Type
2.0 CH Amp
300W x 2
MAX Power Output
300W x 2
Bluetooth + RCA
Input
RCA
Passive SPK +Pre-out
Output
Passive SPK +Pre-out
Treble&Bass Control
≤ 0.005%
THD
<0.003%
≥108dB
SNR
≥110dB
Bluetooth 2.0 CH Amp
Type
Headphone Amp+Preamp
300W x 2
MAX Power Output
–
Bluetooth + RCA
Input
Bluetooth + RCA
Passive SPK +Pre-out
Output
RCA+Headphone+AUX
Treble&Bass Control
≤ 0.005%
THD
≤ 0.02%
≥108dB
SNR
≥103dB
HT4S 
MC351 
V3 
P3 
300 Watts x 2 Power Output: The TI TPA3255 chip amplifier has a feedback design and high-speed gate driver error connection for efficient and quality audio performance, with a low idle loss of <2.5W
High-Efficiency: The chip amplifier has replaceable Op-Amps for a custom approach when compared to the BT20A amplifier. Further, you can swap the 2 plug-in NE5532 Op-Amps for LME49720HA, MUSES02, OPA2604AP, OPA2134PA, LM4562, or NJM4556AD Op-Amps to achieve distinct sound qualities. It boasts an SNR≥108dB and THD≤0.005%
Bluetooth 5.0 Connectivity: The Bluetooth pair can be removed by pressing and holding the volume control for 5 seconds, and it also has a memory function for easy pairing and an alert tone for convenience
Custom Sound with Bass and Treble Controls: The BT20A Pro home audio amplifier has a sound control design so that you can experience sound without effects by setting treble and bass effects to the middle point
Package Contents: The package contains a BT20A Pro power amplifier, a Bluetooth antenna, a 32V/5A power adapter, an AC cord, and a user manual
10 reviews for 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
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$9.99
KPH –
Great Little Integrated Amp!
Great Little Integrated Amp! Very well made of all metal. Easy to assemble and set up. Bluetooth was easy to connect and works great. This little amp has lots of power and sounds great. Runs warm but not hot. A great inexpensive alternative to large, more expensive integrated amps.
Paul Klapper –
Amazing Clean Powerful Streaming
I admit that I have little knowledge of audioAnd electronics.I thought 300 watts of audio power had to come from a big heavy expensive amp. My new house came with 8 ceiling speakers . I had no idea whether they worked or sounded decent. The previous owner left an AVX speaker selector next to a bunch of speaker wires that were coming out of a wall port.I called Cambridge Audio and an advisor told me I would need to buy an amp costing at least $600 to run the speakers. Since I had no idea how it would sound , i looked on Amazon for an alternative. I took a chance on this tiny inexpensive Fosi amp to see if the setup even worked.It turns out that 3 of the 4 zones work and each sounds great using my phones Bluetooth and Apple Music through the Fosi into the speaker selector . I am being cautious with this setup , but I have determined that I can definitely power three zones simultaneously at rockin’ volume. The bass is not earth shaking , but is ok.I am amazed at the sound . Since the speaker selector has an impedance protector switch, I am relatively certain that I will be able to run 3 zones simultaneously without blowing out the speakers.I think the Fosi Amp is great . I am not audiophile and have reasonable expectations. The amp has an 18 month warranty. It is tiny and the Bluetooth is so strong that I do not have to leave my phone next to the amp.I highly recommend this tiny Bluetooth amp.
Sanjeev pogi –
Solid Sound and Easy Setup for Patio Vibes
I’m running this amp with four Yamaha outdoor speakers, and it sounds pretty good. Don’t expect it to be super loud like a big home theater system, but it has plenty of power for hanging out on the patio or in the backyard.What I really like is having full control over the bass and treble—makes it easy to tune the sound just the way I want it. The Bluetooth setup was super quick and simple, paired right away and hasn’t given me any issues.Overall, it’s a solid little amp. Simple, reliable, and the music comes through clear. Perfect for casual listening outdoors.
Newspro –
Great Value Mini Amp—If You Know What to Expect from Class D
Before purchasing this mini amplifier, I thoroughly researched user reviews on Amazon and expert opinions on YouTube to make an informed decision. Most Amazon reviews were positive, though a few two- or three-star ratings with concerning experiences gave me some hesitation. I was already familiar with the sonic characteristics of Class D amplifiers—often described as clear, detailed, and analytical, yet somewhat lean—which aligned with my experience using a 15-year-old Pioneer Elite Class D HT receiver.After purchasing the amp, I tested it with both Bluetooth and CD sources. Overall, I’m satisfied. Bluetooth playback was clear and more than adequate, while CD playback—paired with a small external DAC I also purchased on Amazon—sounded excellent. As expected, the amp delivers a clear, detailed sound signature typical of Class D designs, though slightly on the analytical side.I use this amp in my small study with vintage Mission bookshelf speakers, and the sound quality surpasses that of my previous Denon mini stereo amp. I listen to a variety of music, including acoustic, vocal, jazz, standard pop, and classic rock, and this mini amp–bookshelf speaker combo delivers a satisfying listening experience across genres. Female vocals can occasionally sound slightly elevated in pitch, but this can be adjusted to some extent using the tone controls. Most jazz vocals and instruments retain their nuance, though the overall sound leans toward a slightly analytical and bright tonal character—typical of Class D amplification. Despite this, the amp handles jazz and pop with clarity and energy, making it a solid choice for casual listening.Given its affordable price, this mini amp is a great option for anyone seeking budget-friendly performance in a small to medium-sized room. Unless you’re a critical audiophile, there’s no need to spend hundreds of dollars on a Wiim amp or high-end DAC. For casual music enjoyment, this amp offers exceptional value.
Coder –
Nice little bluetooth capable amp. buy it with the 48v power brick if you can
Rather nice ittle amp with great specs. The power brick it came with was the 32v/5A. It can take a 48/5 power brick, which is strongly preferable. For one thing, cleaner, “effortless” bass, even at lower volume, and you get more distortion free watts. important: Buy it with the 48v PSU, from somewhere where you can chose that option. With that, it would be 5 stars . the stated wattage is optimistically stated. The usable wattage will be limited by the amount of distortion you can tolerate. With 8 ohm speakers, and the 48v brick, I guess you get maybe a clean 50W per channel, maybe. little more.The Amazon description may lead you to think that it comes with the 48v power brick, because it mentions 48v. What that really means, this unit “can take” up to 48v power. You may want high efficiency speakers with this. I use Infinity IL10 bookshelf speakers, and tried with Klipsch RP 820F-s both work great.
Uncino –
Il miglior abbinamento al mio WiiM Pro testato fino a questo punto, solo un po’ meno “caldo” del valvolare (ma sarebbe strano il contrario visto che quello ha un costo dieci volte maggiore e più di 20kg), ma incredibilmente buono per il suo prezzo.Comparato sia con il V3 della stessa Casa che con A07 di Aiyima esce vittorioso grazie alla presenza del controllo di tono.Non di tanto eh, anche quelli suonano molto bene (vedi mia recensione), ma la presenza del controllo di tono evita di dover impiegare l’equalizzatore digitale del WiiM Pro. Non è che questo non vada bene, soprattutto il parametrico, ma sporca un pelino il suono.Proprio sul controllo di tono occorre spendere due parole: è molto efficace, correttamente posizionato come frequenza di intervento, sia per gli alti che per i bassi, e non introduce il minimo rumore.Un po’ peggio va per la parte Bluetooth, obiettivamente non all’altezza del resto.Il confronto è stato condotto usando come sorgente sia Amazon Music Unlimited che Radio Paradise (ovviamente steam FLAC).Questo all’hardware, oltre al già citato WiiM Pro, un paio di diffusori Chario Hiper 1000 (mi piace molto quel tipo di sonorità).Ultima nota: a meno che non abbiate un ambiente molto grande anche su diffusori da 8Ω (che consiglio) l’alimentatore standard da 32V è più che adeguato, e questo vale per tutti gli amplificatori basati su TPA3255.L’alimentazione 48V offre certamente qualcosa in più sia sotto il profilo della potenza massima che nel dettaglio, ma tutto sommato non al punto di giustificare l’acquisto di un alimentatore che da solo costa più della metà dell’intero amplificatore.Acquisto raccomandato?Ma certo che sì, senza sé e senza ma, lo ricomprerei domani mattina!Aggiornamento: come si vede dalla nuova fotografia, ho completato il nuovo impianto con DAC SMSL Sanskrit 10th MKIII (perso “usato come nuovo” all’incredibile prezzo di 67€).Adesso il suono di questo piccolo impianto è letteralmente imbattibile.
Murat Görentaş –
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.
Anvilstrike –
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.
Dany –
Estuve comparando diferentes amplificadores de clase D para conectarlas a unas bocinas polk de exterior, entre ellos Nobsound y Dual, en alternativa a comprar un SMSL ya que sus precios son más elevados.Su tamaño compacto me pareció muy conveniente para su fácil almacenamiento, en comparación a otros como el Dual que es mas grande y voluminoso.Leyendo reseñas y viendo diferentes criticas de youtube me decidí por este amplificador Fosi, vi que un problema recurrente era la pobre conexión vía bluetooth, por lo que de antemano decidí comprar un adaptador para esta función, se puede conectar por los puertos RCA o por AUX.Probé la antena bluetooth que trae el producto y no me pareció mal si solo quieres tener un dispositivo conectado, pero si como yo, buscas que sea fácil cambiar entre dispositivos para reproducir audio y tener un rango mas amplio de conexión, te recomiendo comprar un adaptador multidispositivo con mas alcance.La calidad del sonido es muy buena, se puede apreciar bastante bien el sonido y tienes 3 controles para hacer modificaciones. Los controles de bajos y altos, hacen un buen trabajo pero nada excepcional, lo cual es aceptable por el precio del producto.
Geert De Dier –
Heel klein toestel, stevige constructie, groot vermogen, uitstekende klank, wordt niet warm zelfs na 12 uur continu spelen. De Bluetooth werkt snel en perfect. Heb o.a. toestellen van Denon, Yamaha, Technics sedert jaren. Deze Fosi komt aardig in de buurt wat betreft geluidskwaliteit. Ik heb dit toestel gekocht na het lezen van massa”s reviews van over de hele wereld. Gewoon aangeschaft uit nieuwsgierigheid, en zoals de meeste bezitters ervan, aangenaam verrast door de kwaliteit en vermogen. Geen vervorming bij hoog volume, natuurlijk in combinatie met goede luidsprekers. Levert prima prestaties dit kleine ding. Voor zo’n prijsje bij Amazon deze kwaliteit en prestaties, niet twijfelen.