Fosi Audio BT20A MAX Bluetooth Stereo Power Amp
Effortless Connectivity across All Scenarios
Meticulously tuned by our acoustic engineers, it brings you a neutral and detailed sound that makes your music feel closer—more alive and vivid.
Key Features
• Hi-Res Bluetooth 6.0 (Qualcomm QCC3095) with support for multiple codecs including:
- SBC, AAC, aptX, aptX HD, aptX Adaptive, aptX Lossless, LDAC
• PFFB Technology — reduces distortion and improves sound purity.
• Dual independent power supply architecture with Japanese ELNA capacitors for cleaner power.
• Enhanced cooling design with a built-in silent fan for more efficient thermal management.
• Motorized volume control with included remote control.
• Dedicated High-Pass Filter (HPF) mode and Bypass mode.
• 12V trigger input for synchronized system power control.
• Bass and treble tone controls.
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 (≥ 112dB), while also enhancing linearity and frequency response to deliver greater sound purity and improve overall system efficiency.
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%.
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.
Impressive Chip Performance
Powered by Texas Instruments TPS3255 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.
Hi-Res Bluetooth Codecs
With Bluetooth 6.0, the BT20A MAX supports a wide range of high-quality codes such as LDAC, aptX, and aptX Lossless, delivering a table, low-latency connection and high-resolution listening experience across the room.
- Qualcomm Chip: QCC3095
- Max Sampling Rate: PCM 24bit/96kHz
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.
Performance & Power
• Channel configuration: 2.1 (able to support a subwoofer)
• Max Output Power: 300W × 2 @ 4 Ω
• RMS Output Power: 180W × 2 @ 4 Ω
• Signal-to-Noise Ratio (SNR): ≥ 112 dB
• Total Harmonic Distortion + Noise (THD+N): ≤ 0.003 %
• Terminal Impedance: Supports 2–8 Ω speakers
• Frequency Response: 20 Hz–20 kHz (±0.5 dB)
• Voltage Range: DC 32V – 48V
Connectivity
Inputs
• Bluetooth 6.0
• Dual RCA analog inputs (RCA1 and RCA2)
• Dedicated input-select button
Outputs
• Main Speaker Output
• Subwoofer Output (for 2.1 setups)
Design & Build
• Compact but powerful Class D stereo amplifier design.
• Glossy + matte front panel finish with minimal visible screws.
• Cooling vents on top and sides for airflow.
In the Box
• BT20A Max Power Amplifier × 1
• Bluetooth Antenna × 1
• User’s Manual × 1
• IR Remote × 1
• Power Adapter (32V) × 1
