What functions does the remote control support?

The included IR remote can reset Bluetooth, switch inputs, control music tracks(in Bluetooth mode), and even control other Fosi gear(P4/ZD3/ZP3).

What should I do if someone else is connected to the amplifier via Bluetooth?

Press the RESET button on the remote to instantly drop the current connection, and clear the historically connected devices. Then pair your own device fresh (No Bluetooth reconnection function).

Can I listen to three audio inputs(Bluetooth and dual RCA inputs) simultaneously?

In TONE mode, the EQ controls are active, it can adjust the sound by treble and bass control. In Bypass mode, it bypasses the internal EQ, including treble and bass adjustments, to preserve the original audio signal output.

Fosi Audio BT20A MAX Bluetooth Stereo Power Amp - Fosi Audio

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Fosi Audio BT20A MAX Bluetooth Stereo Power Amp

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$229.99

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Features

Reduce Distortion with PFFB Feedback
Deliver High-Power 2.1 Output
Enable Hi-Res Bluetooth Streaming

Power Supply Unit: 32V 5A

32V 5A
48V 5A
48V 5A GaN

Shipping to: US

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Fosi Audio BT20A MAX Bluetooth Stereo Power Amp

32V 5A / US

$229.99

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High-Res Bluetooth Audio

BT20A MAX features a Qualcomm QCC3095 chipset with Bluetooth 6.0. Supporting a range of high-quality codecs including aptX, aptX HD, aptX Adaptive, aptX Lossless and LDAC, it ensures a stable, low-latency, and high-resolution listening experience.

Max Output Power: 300W × 2 @ 4Ω
RMS Output Power: 180W × 2 @ 4Ω
SNR: ≥ 112 dB
THD+N: ≤ 0.003%

Our Best-Sounding Amp Yet

The BT20A MAX is Fosi Audio’s first stereo amplifier to feature PFFB technology. This technology minimizes distortion (≤0.003%) and boosts the SNR (≥112 dB), while also enhancing linearity and frequency response to deliver greater sound purity and improve overall system efficiency.

PFFB Technology

Dual Independent Power Supply

BT20A MAX adopts a dual-rail power architecture with separate supplies for the digital and analog sections. Paired with Japanese ELNA capacitors, it effectively reduces noise interference, delivering cleaner power and a purer sound background. This design further enhances the performance of the PFFB technology, ensuring stable and high-fidelity audio output.

Enhanced Cooling Design

Cooling vents are specially designed on the top and sides of the chassis to ensure proper airflow. Building on the PRO version, the BT20A MAX further refines its circuit design and features a built-in silent fan, improving overall cooling efficiency by 30%.

Cooling Upgarde

Compact Size, Giant Sound

With peak power reaching 300W per channel, the BT20A MAX delivers excellent control and can effortlessly drive mainstream speakers. It not only faithfully reproduces the subtle emotions of vocals but also creates a wide, immersive soundstage with ease.

300W Peak Power

Impressive Chip Performance

Powered by Texas Instruments TPA3255 amp chip with NE5532 op-amps and finely tuned by our professional acoustic team, the BT20A MAX delivers detailed and natural sound. Its tonal, musical bass and clean separation offer a living, emotional journey.

TPA3255 + NE5532

Flagship CS4398 DAC

Ensure high-resolution Bluetooth input with precise reproduction, rich detail, minimal distortion.

Dedicated Decoding

Hi-Res Bluetooth Codecs

With Bluetooth 6.0, the BT20A MAX supports a wide range of high-quality codecs such as LDAC, aptX, and aptX Lossless, delivering a stable, low-latency connection and a high-resolution listening experience across the room.

Easily Build Your 2.1 System

Designed for refined 2.1 audio systems, it includes a dedicated subwoofer output for seamless bass integration. Equipped with two RCA inputs and a Bluetooth input, it supports up to three audio sources, while the independent input-selection button allows seamless switching between them.

Practical Audio Solution

Featuring a motorized volume knob with remote control, the BT20A MAX delivers smoother volume adjustment with lower noise and distortion, allowing you to manage Bluetooth, inputs, and playback from your seat, while the selectable high-pass mode offloads bass to improve midrange clarity and vocal detail.

Thoughtful Companion

BT20A MAX offers practical and flexible listening options, including a Bypass Mode for a clean, noise-free signal path, Bass and Treble controls for personalized sound tuning, and a 12V Trigger Input that enables synchronized power on/off with connected devices for a smoother system experience.

Aesthetics Meet Texture

Blending glossy and matte finishes, the front panel offers one of the cleanest implementations with no screws visible. The chassis provides a refined touch, while seamless rounded edges highlight the precision of its craftsmanship.

2.1 Home Audio System

Wireless Listening Indoors

Outdoor Audio Enjoyment

Product details

Description

Purity Sound: Featuring PFFB technology and dual independent power supply, this stereo amplifier delivers ultra-low distortion (≤0.003%) and high SNR (≥112dB). It can reduce noise interference, resulting in a clean, detailed audio performance.

Enhanced Cooling System: Powered by the TPA3255 & NE5532 chips, the BT20A MAX delivers 300W per channel. Its enhanced design includes a built-in silent fan, improving cooling efficiency by 30% over the PRO version for stable, high-power performance.

Hi-Res Bluetooth Connectivity: Equipped with Qualcomm Chip QCC3095, Bluetooth 6.0 with support for LDAC/aptX Lossless/aptX HD/aptX Adaptive/aptX/SBC/AAC codecs, max sampling rate PCM 24bit/96kHz. Delivering a stable, low-latency connection.

Versatile Connectivity: Featuring dual RCA inputs, dedicated subwoofer output, and the motorized analog potentiometer allows precise adjustments via the included remote control, perfect for building a 2.1 amplifier home audio system.

All-in-One Audio Control: Enjoy pure sound with Bypass mode, while customizable bass & treble controls in Tone mode. The 12V Trigger input enable synchronized power on/off, and the HPF adjustment for speaker performance.

Specifications

Channel: 2.1
Chipset: TI TPA3255, NE5532
Max Output Power: 300W × 2 @ 4Ω
RMS Output Power: 180W × 2 @ 4Ω
Input: RCA1 / RCA2 / Bluetooth
Output: Speaker Out / Sub Out
SNR: ≥ 112 dB
THD+N: ≤ 0.003%
Terminal Impedance: 2–8Ω
Bluetooth SoC: Qualcomm QCC3095
Bluetooth Device Name: Fosi Audio BT20A MAX
Bluetooth Version: 6.0
Bluetooth Connection Range: ≤ 15 m (50 ft)
Bluetooth Audio Codecs: SBC / AAC / aptX / aptX HD / aptX Adaptive / aptX Lossless / LDAC
Frequency Response: 20 Hz–20 kHz (±0.5 dB)
Voltage Range: DC 32 V–48 V

What‘s in the box？

BT20A Max Power Amplifier x 1
Bluetooth Antenna x 1
User’s Manual x 1
IR Remote x 1
Power Adapter x 1

Which Amp Is Right for You?

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Fosi Audio BT20A

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Release Date

2020

Channels

2.0

Bluetooth Chip

ATS2853

Amplifier Chip

TI TPA3116, NE5532

Max Output Power

100W × 2

Inputs

RCA, BT

Outputs

Speaker Out

SNR

≥ 98dB

THD+N

≤ 0.5%

Input Switch

Auto Switch

Bass & Treble Control

Supported

Bluetooth

5.0: SBC, AAC

Other Features

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Fosi Audio BT20A Pro

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Release Date

2023

Channels

2.0

Bluetooth Chip

ATS2853

Amplifier Chip

TI TPA3255, NE5532

Max Output Power

300W × 2 @ 4Ω

Inputs

RCA, BT

Outputs

Speaker Out

SNR

≥ 108dB

THD+N

< 0.005%

Input Switch

Auto Switch

Bass & Treble Control

Supported

Bluetooth

5.0: SBC, AAC

Other Features

From $229.99

Fosi Audio BT20A MAX

Learn more

Release Date

2025

Channels

2.0 / 2.1

Bluetooth Chip

Qualcomm QCC3095

Amplifier Chip

TI TPA3255, NE5532

Max Output Power

300W × 2 @ 4Ω

Inputs

RCA1, RCA2, BT

Outputs

SUB Out, Speaker Out

SNR

≥ 112dB

THD+N

≤ 0.003%

Input Switch

Dedicated Switch Button

Bass & Treble Control

Supported

Bluetooth

6.0: SBC, AAC, aptX, aptX HD, aptX Adaptive, aptX Lossless, LDAC

Other Features

Remote Control, PFFB Technology, Bypass, High-Pass Filter, 12V Trigger, Motorized Potentiometer

From $79.99

Fosi Audio BT20A

Learn more

Release Date

2020

Channels

2.0

Bluetooth Chip

ATS2853

Amplifier Chip

TI TPA3116, NE5532

Max Output Power

100W × 2

Inputs

RCA, BT

Outputs

Speaker Out

SNR

≥ 98dB

THD+N

≤ 0.5%

Input Switch

Auto Switch

Bass & Treble Control

Supported

Bluetooth

5.0: SBC, AAC

Other Features

From $79.99

Fosi Audio BT20A Pro

Learn more

Release Date

2023

Channels

2.0

Bluetooth Chip

ATS2853

Amplifier Chip

TI TPA3255, NE5532

Max Output Power

300W × 2 @ 4Ω

Inputs

RCA, BT

Outputs

Speaker Out

SNR

≥ 108dB

THD+N

< 0.005%

Input Switch

Auto Switch

Bass & Treble Control

Supported

Bluetooth

5.0: SBC, AAC

Other Features

From $229.99

Fosi Audio BT20A MAX

Learn more

Release Date

2025

Channels

2.0 / 2.1

Bluetooth Chip

Qualcomm QCC3095

Amplifier Chip

TI TPA3255, NE5532

Max Output Power

300W × 2 @ 4Ω

Inputs

RCA1, RCA2, BT

Outputs

SUB Out, Speaker Out

SNR

≥ 112dB

THD+N

≤ 0.003%

Input Switch

Dedicated Switch Button

Bass & Treble Control

Supported

Bluetooth

6.0: SBC, AAC, aptX, aptX HD, aptX Adaptive, aptX Lossless, LDAC

Other Features

Remote Control, PFFB Technology, Bypass, High-Pass Filter, 12V Trigger, Motorized Potentiometer

5 stars: 60 (87%)
4 stars: 6 (9%)
3 stars: 2 (3%)
2 stars: 1 (1%)
1 star: 0 (0%)

excellent little machine

lots of punch in a small footprint!

Budget powerhouse!

Got it paired with my Hifi rose rs201e all in one Streaming unit. Playing through a pair of polk r200 shelf speakers and a JBL L10cs subwoofer.
Incredible clarity and detail. One detail to add, make sure you get the 48v 5a power supply, to push the full potential of the amp! Definitely puts out Incredible sound and very low noise disturbance. What more can I say, I'm quite impressed!

BT20A MAX Bluetooth Stereo

I’ve been really impressed with the Fosi Audio BT20A MAX. It paired surprisingly well with my vintage speakers and brought them to life with a warm, clean, and powerful sound. Plenty of volume, good bass control, and very clear mids/highs without sounding harsh. For the size and price, it exceeded expectations and works great for anyone running older speakers in a modern setup.

Guter Verstärker mit toller Leistung und hochwertigen Bluetooth Codec wie LDAC

Kompakter, sehr gut verarbeiteter Verstärker mit überraschend viel Leistung.
Klingt sauber, dynamisch und ausgewogen – selbst bei höherer Lautstärke bleibt er kontrolliert.

Bluetooth funktioniert zuverlässig (inkl qualitativ hochwertigem LDAC) mit ausreichender Reichweite und die Klangregler (Bass/Treble) machen das Gerät deutlich flexibler für verschiedene Lautsprecher und Räume.
Auch der motorisierter Lautstärke-Regler ist ein Vorteil wenn man zwischen der Regelung am Gerät sowie der Fernbedienung wechselt - man sieht immer wo der Regler tatsächlich steht.

Für den aufgerufenen Preis ein prima Verstärker!

Excelente Amplificador

Excelente amplificador. Lo adquirí desde su lanzamiento y lo he usado constantemente desde entonces, y la verdad me ha encantado. Venía del modelo BT20A Pro y este se siente como una mejora clara en control, claridad y desempeño general.
Desde el primer momento se nota un sonido más limpio, con mejor separación de instrumentos y un grave más firme.
Uno de sus puntos fuertes son las funciones adicionales. El Tone Bypass permite una señal más pura cuando se desea, las dos entradas RCA son muy prácticas para múltiples fuentes, y el filtro de graves ayuda mucho a integrar el subwoofer de forma más controlada y sin saturación.
También destaca su capacidad para mover bien los altavoces, manteniendo control incluso a volúmenes altos sin distorsión evidente.
Visualmente es compacto, limpio y moderno, encajando perfectamente en cualquier setup.
En resumen, es una actualización muy bien lograda que combina buen sonido, funcionalidad y diseño. Totalmente recomendado para quienes buscan un amplificador compacto pero con rendimiento serio.

Surprising quality and power for its size. And when connected to the ZD3 DAC from the same brand, it's a winning combination. Of course, it's better with a 48 V power supply. It has nothing to envy of more renowned and larger equipment. The seller, unbeatable.

Brutally good sound!

At the heart of my system is the Fosi Audio ZH3 DAC and Fosi Audio BT20A MAX power amplifier, forming the core of a clean, high-output 2.2-channel setup. The ZH3 handles digital conversion and preamp duties, while the BT20A MAX delivers strong, controlled amplification with excellent dynamic headroom. They are seated on a brutalist style end table from the 1960s. This table weighs over a 100 pounds and acts as a sound damper as well.

The amplifier drives Quad 12L bookshelf speakers, supported by dual PreSonus Eris Sub 8BT 8-inch powered subwoofers for extended, well-integrated low-frequency performance.

Signal sources include an iPhone connected via USB-C, streaming TIDAL and a library of over 7,000 lossless CD-quality tracks on Apple Music, along with a Fire TV for movies and streaming content.

Connections are upgraded with Nakamichi Excel Series 24k gold-plated banana plugs, and both the amp and subs use heavy-duty power cords. The entire system is powered through a Black Lion Audio PG-P Portable Power Conditioner for clean, stable power delivery.

Acoustic treatment is handled by TroyStudio 12" x 12" x 4" broadband acoustic foam panels mounted directly behind the seating position at ear level to control rear-wall reflections and enhance imaging clarity.

For video, the setup includes a ViewSonic M2 1080p portable projector paired with a QualGear 100-inch fixed-frame 16:9 4K Ultra White projection screen (1.2 gain), creating an immersive large-format viewing experience.

The result is a streamlined, Fosi-centered system delivering strong stereo imaging, dynamic impact, and cinematic scale in a medium-sized room — a compact but dynamic 2.2-channel system focused on clarity, controlled low-end, and strong stereo imaging. The sound from this amp is brutally good!!!!! Fosi I sent you a resume because I want to work for you and sell your amazing audio equipment!

Very good

Perfect Fit

I had a fairly specific need. The BT20A Max is exactly what I was looking for. I have a very small shelf with a turntable on a shelf below it. Rack sized audio equipment would fit but it did not allow me to move my rear-ported bookshelf speakers away from the wall. I needed something small, with phono inputs or multiple inputs, enough power to push my inefficient rear-ported speakers, Bluetooth and remote control. I have a subwoofer to go with the bookshelf speakers. The BT20A Max has a sub out and it has an 80 hz frequency filter. I am over the moon happy with this little amp. It doesn't have a phono line input but it does have multiple inputs so I was able to purchase the highly rated Box X5 phono preamp to fill all of my needs.
The elephant in the room needs to be addressed. Yes it has a fan. Yes it is BARELY audible at very low volume. Is it a distraction? NO. I have very sensitive hearing. It's a blessing and a curse. Too many reviewers talked about the fan noise and I have to admit, I was a little concerned. I do not do any near-field listening with my setup so I felt pretty confident that the soft fan sound would not be an issue. I feel like you would have to be sitting right next to the amp and be listening at very low level to even hear the fan. Do not let it stop you if you are leaning towards purchasing this little powerhouse amp. I went with the 48v power supply because of my inefficient speakers.
There is so much positive feedback I have for the Fosi Audio BT20A Max. Just buy it.

Ottimo apparato

Excellent Product With A Couple Of Issues

Where to start? First the good. This is an amazing product in a small package. The bass management is well implemented, the tone bypass is appreciated. The styling is very understated yet attractive, and the power is more than adequate especially with the larger power supply. It has the capability to make my speakers disappear leaving only the music; you can’t ask for much more than that in an audio product.

I’d like to see a couple of small additions to the design. I wish there were a couple of LEDs on the front panel to indicate when the Tone Bypass and the High Pass Filter are engaged. There is no indication now at all.

Now the bad. On the first unit I received the switch for the HPF and the power input were not flush with the back of the case. In fact they were pushed so far in that the HPF switch could not be activated at all. Now the worse: even though I sent a picture and description of the issue to them, their first reaction was that they could not see a problem. It wasn’t until I sent another detailed photograph comparing the back of a unit on their website with the one I received that they acknowledged the issue. Then, their first solution was for me to open the case up and try to fix it myself. When I said this was not satisfactory as I have neither the tools or the expertise, they agreed to send another one to me. I agreed to this, and was prepared to send the defective one back. I received a tracking number for the replacement and a link to a website. Unfortunately the site was entirely in written Chinese which unfortunately I can not understand. The only thing I could see was shipping dates and it was apparent that nothing was on its way to me. When I followed up I was informed that they were out of stock. I could go on about not being able to understand the shipping website, the inability to contact the actual shipping company, or the fact that when the unit did show up the website indicated that it had been received and signed for when in fact I did not even know it was here and had been placed against an outside door that isn’t in use. I won’t even mention the emails I received during the interim enquiring if I had sent the original unit back yet.

Now the epilogue: The replacement unit I received has the same issue of the HPF switch and power input not being fitted correctly into the case. Obviously there are some teething pains on the production line. At this point I give up. Even though the replacement has the same problem it is not to the same degree; the HPF switch can be activated, so I am just going to live with it. It didn’t cost a huge amount of money, and I really am very impressed with the performance.

BT20A Max

Excellent Amp, perfect works with my 25 years old Mission speaker.

Great

Great product. Use the BT20a Max in combination with my new Dali SP speakers.

Great amplifier!

It’s really powerful and works great for what I need, especially the high pass filter and Bluetooth functions. Just wish it was a bit cheaper, I had the promo code saved but completely forgot to use it. Great product!

Solid upgrade from ZA3

The dynamic range of the BT20A MAX is a noticeable improvement over the ZA3 it replaced. Bluetooth worked well. The remote appears to be a remote for multiple Fosi products. Pay attention to the buttons on the remote to know which ones work for the BT20A. They are labeled. Wish this had a phono input like the ZA3. That's my only criticism thus far. Overall, very pleased.

I belong to a typical user.

The analog amplifier i used before guarantees many functions and sound quality, but i learned from years of experience. I wanted to listen more comfortably, so i often connected it to a bluetooth speaker rather than an amplifier. After testing, this product supports seamless bluetooth and supports aptx lossless to connect lightly, but it guarantees quite good sound quality.

The exterior is also simple and luxurious with an aluminum body.

I am also very satisfied with the power that will remain even after ringing all the kef passive speakers i have.

If you want to listen to music conveniently, i recommend this product.

Happy customer

For such a relatively small amp it punches well above its wait, easily driving my large old Realistic Mach 2 amps and the sound is crystal clear. Very happy. The order and delivery was fast and easy. I definitely highly recommend Fosi.

Works great with my Klipsch

Works great with my Klipsch speakers

BT20A max

A great little product, everything noted about this amp is correct and exceeds expectations

Mini Bluetooth Amp provided very power and solid Sound this new Version come with remote control . Likes

Il tuo carrello è vuoto.

Fosi Audio BT20A MAX Bluetooth Stereo Power Amp

Review Videos

A Budget Amp That Fixed Class D's Problems...

This Little Amp Hits HARD!

The Next Generation of Fosi!

BT20A MAX Its a CORKER!

Confused About Desktop Amps?

A Budget Amp That Fixed Class D's Problems...

This Little Amp Hits HARD!

The Next Generation of Fosi!

BT20A MAX Its a CORKER!

Confused About Desktop Amps?