FOSI AUDIO BT20A MAX

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FOSI AUDIO BT20A MAX

FOSI AUDIO BT20A MAX

FOSI AUDIO BT20A MAX Class D Amplifier 48 V 5A
The FOSI Audio BT20A MAX is a Class D stereo amplifier designed to power passive speakers with a high level of control and power in a compact format. It delivers up to 300W per channel under 2 and 4Ω (180W RMS), relying on a PFFB (Post Filter Feedback) architecture and a segmented power supply to maintain low distortion and a high signal-to-noise ratio, even under variable load conditions.

Designed for both compact Hi-Fi installations and scalable 2.1 systems, it combines comprehensive analogue connectivity with high-definition Bluetooth reception, supporting LDAC and aptX codecs in their advanced versions. This versatility allows it to function as the main amplifier in a modern home system, while maintaining stable, consistent performance suitable for a wide range of sources and speakers.

Fosi Audio BT20A MAX: PFFB architecture
The BT20A MAX adopts a PFFB (Post Filter Feedback) architecture, where the feedback loop is taken after the output filter, thus integrating the actual behaviour of the power stage and load into the correction process. This approach effectively minimises harmonic distortion, measured at ≤ 0.003%, while optimising the signal-to-noise ratio to ≤ 112dB, ensuring stable and consistent reproduction regardless of speaker impedance variations. Beyond reducing switching artefacts, this topology improves signal control across the entire audio band, with a direct impact on dynamic accuracy and bass response.

Fosi Audio BT20A MAX: Dual independent power supply
This signal control logic is extended by a power supply split between the analogue and digital stages, isolating switching currents from noise-sensitive circuits. The integration of ELNA capacitors ensures stable energy reserves while reducing high-frequency interference, resulting in more consistent voltage and fewer parasitic fluctuations. This functional separation helps preserve micro-dynamics and detail clarity, even at high levels.

Fosi Audio BT20A MAX: Amplification stage
The amplification stage is based on a combination of the TPA3255 chip for power conversion and a NE5532 operational amplifier dedicated to upstream signal processing, allowing for a precise balance between energy efficiency and linearity. This architecture allows for a maximum output power of 300W per channel into 2 and 4Ω, while maintaining rigorous control of transients. For those using low-efficiency or complex-load speakers, this power reserve translates into sustained dynamics without perceptible compression.

Fosi Audio BT20A MAX: Improved cooling
In order to maintain this performance over time, the BT20A MAX incorporates a redesigned cooling system, with openings positioned on the top and sides of the chassis to promote natural air circulation. This passive dissipation is complemented by a silent fan, increasing overall thermal efficiency by approximately 30% while limiting acoustic impact. This thermal management stabilises the operation of internal components, particularly during prolonged high-power use.

FOSI AUDIO BT20A MAX SPECIFICATIONS
Product type Integrated amplifier
Inputs 2x Stereo RCA
Bluetooth 6.0
Outputs Speaker terminal
1x Subwoofer output
Amplification type Class D
Amplification chip TI TPA3255
Output power RMS power : 180W @ 2-4Ω
MAX power : 300W @ 2-4Ω
Supported impedances 2-8Ω
Frequency response 20Hz-20kHz (±0.5dB)
Total harmonic distortion more noise (THD+N) ≤ 0,003%
Signal-to-noise ratio ≥ 112 dB
Bluetooth chip Qualcomm QCC3095
Supported codecs SBC / AAC / aptX / aptX HD / aptX Adaptive / aptX Lossless / LDAC

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