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 BT20A MAX Bluetooth Stereo Power Amp

9 total reviews

$229.99

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

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

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

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Bluetooth

5.0: SBC, AAC

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Release Date

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Channels

2.0

Bluetooth Chip

ATS2853

Amplifier Chip

TI TPA3225, 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

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Fosi Audio BT20A MAX

Learn more

Release Date

2025

Channels

2.0 / 2.1

Bluetooth Chip

Qualcomm QCC3095

Amplifier Chip

TI TPA3225, 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