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NEW Fosi Audio BT20A MAX Bluetooth Stereo Amplifier

Fosi AudioPart # 235-253
Model: BT20A MAX-48V

The Fosi Audio BT20A MAX is a compact Class D stereo amplifier designed to deliver high output and modern connectivity in a small form factor. It combines powerful amplification, Bluetooth streaming, and flexible system integration features, making it suitable for desktop, home audio, and 2.1 speaker setups. 48V 5A power supply included.

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Key Features

  • PFFB technology lowers distortion and improves linearity for cleaner, more natural sound
  • Dual independent power supply helps reduce noise interference for a purer background
  • Bluetooth 6.0 with LDAC, aptX HD, aptX Adaptive, and aptX Lossless supports higher-quality wireless playback
  • Dual RCA inputs plus Bluetooth let you switch easily between three audio sources
  • Dedicated subwoofer output makes it easier to build a refined 2.1 system
  • Motorized analog potentiometer reduces noise and distortion while enabling smoother remote volume control
  • Selectable HPF mode can offload bass from the main speakers to improve vocal clarity and detail
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Overview

Fosi Audio BT20A MAX Bluetooth Stereo Amplifier

Fosi Audio BT20A MAX Bluetooth Stereo Amplifier

Effortless Connectivity Across All Scenarios

Carefully tuned by our acoustic engineers, it delivers a neutral, detailed sound that brings your music closer, making it feel more vivid and lifelike.

High-Res

The BT20A MAX uses a Qualcomm QCC3095 chipset with Bluetooth 6.0. It supports high-quality codecs including aptX, aptX HD, aptX Adaptive, aptX Lossless, and LDAC, delivering stable, low-latency, high-resolution audio performance.

Our Best-Sounding Amp Yet

The BT20A MAX is Fosi Audio’s first stereo amplifier to incorporate PFFB technology. This design reduces distortion to ≤0.003%, increases SNR to ≥112 dB, and improves linearity and frequency response for cleaner sound and higher overall efficiency.

Dual Independent Power Supplies

The BT20A MAX uses a dual-rail power architecture with independent supplies for the digital and analog sections. Combined with Japanese ELNA capacitors, it reduces noise interference, providing cleaner power and a quieter background. This design further supports PFFB performance, delivering stable, high-fidelity audio output.

Enhanced Cooling Design

Cooling vents are strategically placed on the top and sides of the chassis to promote effective airflow. Building on the PRO version, the BT20A MAX features an improved circuit design and a built-in silent fan, increasing overall cooling efficiency by 30%.

Compact Size, Giant Sound

With peak power up to 300W per channel, the BT20A MAX provides strong control and easily drives a wide range of speakers. It accurately reproduces vocal detail while delivering a spacious, immersive soundstage.

Impressive Chip Performance

Powered by the Texas Instruments TPA3255 amplifier chip with NE5532 op-amps and carefully tuned by our acoustic team, the BT20A MAX produces detailed, natural sound. Its well-balanced bass and clear separation create a rich, engaging listening experience.

Flagship CS4398 DAC

Delivers high-resolution Bluetooth input with accurate reproduction, detailed sound, and low distortion.

Hi-Res Bluetooth Codecs

With Bluetooth 6.0, the BT20A MAX supports high-quality codecs such as LDAC, aptX, and aptX Lossless, providing a stable, low-latency connection and high-resolution audio performance throughout the room.3

Easily Build Your 2.1 System

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

A Practical Audio Solution

Featuring a motorized volume knob with remote control, the BT20A MAX provides smoother volume adjustment with reduced noise and distortion. It allows you to control Bluetooth, inputs, and playback from your seat, while the selectable high-pass mode shifts bass duties to improve midrange clarity and vocal detail.

A Thoughtful Companion

The BT20A MAX provides versatile listening options, including a Bypass Mode for a clean, low-noise signal path, bass and treble controls for custom sound adjustment, and a 12V trigger input for synchronized power on and off with connected components.

Aesthetics Meet Texture

The BT20A MAX provides versatile listening options, including a Bypass Mode for a clean, low-noise signal path, bass and treble controls for custom sound adjustment, and a 12V trigger input for synchronized power on and off with connected components.

2.1 Home Audio System

Wireless Listening Indoors

Purity Sound
With PFFB technology and a dual independent power supply, this stereo amplifier achieves ultra low distortion (≤0.003%) and a high SNR (≥112 dB). It minimizes noise interference to deliver clean, detailed audio performance. 

Enhanced Cooling System
Using the TPA3255 and NE5532 chips, the BT20A MAX delivers up to 300W per channel. Its updated design includes a built in silent fan, increasing cooling efficiency by 30% over the PRO version for stable high power operation. 

Hi Res Bluetooth Connectivity
Equipped with the Qualcomm QCC3095 chip and Bluetooth 6.0, it supports LDAC, aptX Lossless, aptX HD, aptX Adaptive, aptX, SBC, and AAC codecs, with a maximum sampling rate of PCM 24 bit/96 kHz, providing a stable low latency connection. 

Versatile Connectivity
Includes dual RCA inputs, a dedicated subwoofer output, and a motorized analog potentiometer for precise control using the included remote, making it ideal for 2.1 home audio systems. 

All in One Audio Control
Bypass mode provides a clean signal path, while tone mode allows bass and treble adjustment. A 12V trigger input enables synchronized power control, and the high pass filter improves overall 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?

BT20A

BT20A Pro

BT20A MAX


BT20ABT20A ProBT20A MAX
Release Date202020232025
Channels2.02.02.0 / 2.1
Bluetooth ChipATS2853
ATS2853
Qualcomm QCC3095
Amplifier ChipTI TPA3116, NE5532
TI TPA3225, NE5532
TI TPA3225, NE5532
Max Output Power100W × 2
300W × 2 @ 4Ω
300W × 2 @ 4Ω
InputsRCA, BT
RCA, BT
RCA1, RCA2, BT
OutputsSpeaker Out
Speaker Out
SUB Out, Speaker Out
SNR≥ 98dB
≥ 108dB
≥ 112dB
THD+N≤ 0.5%
< 0.005%
≤ 0.003%
Input SwitchAuto Switch
Auto Switch
Dedicated Switch Button
Bass & Treble ControlSupported
Supported
Supported
Bluetooth5.0: SBC, AAC
5.0: SBC, AAC
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

Product Details

BrandFosi Audio
ModelBT20A MAX-48V
Part Number235-253
Unit of MeasureEach
Weight4.2

Product Specifications

Power (RMS/Channel 8 ohms)101 - 250 Watts
Weight Range< 10 lbs.
Special FeaturesBluetooth

Specifications

Q&A

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Manuals & Resources

California Prop 65

WARNING: Cancer and Reproductive Harm

www.P65Warnings.ca.gov