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Power amplifiers stereo — Fosi Audio BT20A MAX
Description, images, technical data and specifications
Fosi Audio BT20A MAX
Image source — © Fosi Audio
The BT20A MAX is an accomplished compact power amplifier from Fosi Audio, offering front-panel high- and low-frequency tone control alongside a comprehensive wireless connectivity suite. The BT20A MAX brings Fosi Audio's considered engineering to a compact, feature-rich desktop amplification format.
Key specs that matter
Output power reaches a substantial 300W into 4 ohms. Frequency response spans 20Hz to 20,000Hz within plus-or-minus 3dB. Signal-to-noise ratio is at least 112dB, with total harmonic distortion plus noise at a low 0.003% at 100% global feedback. Bluetooth 6.0 connectivity uses a Qualcomm QCC3095 chip supporting LDAC and aptX Lossless codecs, alongside two RCA line inputs, screw terminals for speaker wire, a 12V trigger input, and a subwoofer output. At 140 x 148 x 45mm and 0.88kg, the BT20A MAX maintains a compact desktop-amplifier chassis packing substantial output power.
Sound and use context
Expect a clean, powerful presentation reflecting the substantial 300W-into-4-ohms output combined with the low 0.003% distortion figure, with the front-panel tone controls and comprehensive Bluetooth codec support delivering genuine everyday flexibility.
Pairing
The subwoofer output and 12V trigger input allow the BT20A MAX to integrate into a small system alongside a subwoofer or triggered peripheral, and the aptX Lossless and LDAC codec support suits high-resolution wireless sources.
Alternatives
Other manufacturers' comparable compact class-D amplifiers offer alternatives for buyers wanting to compare Bluetooth codec support at a similar price point.
Key specs that matter
Output power reaches a substantial 300W into 4 ohms. Frequency response spans 20Hz to 20,000Hz within plus-or-minus 3dB. Signal-to-noise ratio is at least 112dB, with total harmonic distortion plus noise at a low 0.003% at 100% global feedback. Bluetooth 6.0 connectivity uses a Qualcomm QCC3095 chip supporting LDAC and aptX Lossless codecs, alongside two RCA line inputs, screw terminals for speaker wire, a 12V trigger input, and a subwoofer output. At 140 x 148 x 45mm and 0.88kg, the BT20A MAX maintains a compact desktop-amplifier chassis packing substantial output power.
Sound and use context
Expect a clean, powerful presentation reflecting the substantial 300W-into-4-ohms output combined with the low 0.003% distortion figure, with the front-panel tone controls and comprehensive Bluetooth codec support delivering genuine everyday flexibility.
Pairing
The subwoofer output and 12V trigger input allow the BT20A MAX to integrate into a small system alongside a subwoofer or triggered peripheral, and the aptX Lossless and LDAC codec support suits high-resolution wireless sources.
Alternatives
Other manufacturers' comparable compact class-D amplifiers offer alternatives for buyers wanting to compare Bluetooth codec support at a similar price point.
Specifications
Model name
BT20A MAX
Input sensitivity (mV)
N/A
Input impedance (balanced) (Ω)
N/A
Input impedance (single-ended) (Ω)
N/A
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
Max current (A)
N/A
Output power (8Ω) (W)
N/A
Output power (4Ω) (W)
300
Gain (dBu)
N/A
Frequency response low +/- 3dB (Hz)
20
Frequency response high +/- 3dB (Hz)
20 000
Signal to Noise Ratio (dB)
≥ 112
Total Harmonic Distortion + Noise (0% global feedback) (%)
N/A
Total Harmonic Distortion + Noise (100% global feedback) (%)
0.003
Max power consumption (W)
N/A
Damping factor
N/A
Dimensions (mm)
140 x 148 x 45
Weight (kg)
0.88
Official link