Fosi Audio BT20A MAX 2-Channel Bluetooth Power Amplifier for Speakers

Experience powerful, clean, and truly high-resolution amplification with the Fosi Audio BT20A MAX Bluetooth Stereo Power Amplifier — Fosi Audio’s most advanced compact amp to date. Meticulously tuned by Fosi’s acoustic engineers, the BT20A MAX delivers a neutral, transparent, and highly detailed sound signature, bringing your music closer, richer, and more lifelike.

Designed for modern home audio systems, desktop setups, and 2.1 speaker configurations, this amplifier combines reference-grade sound performance, next-generation Bluetooth 6.0, and massive output power in a compact yet robust chassis.

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Our Best-Sounding Fosi Amplifier Yet

The BT20A MAX is Fosi Audio’s first stereo amplifier equipped with PFFB (Post-Filter Feedback) technology — a major advancement in Class-D amplification.

This technology dramatically improves system linearity and frequency response while keeping distortion extremely low.

• Ultra-low THD+N ≤ 0.003%

• High Signal-to-Noise Ratio ≥ 112 dB

• Cleaner mids, tighter bass, and improved detail retrieval

• More accurate sound at both low and high volumes

The result is pure, fatigue-free audio that faithfully represents your speakers’ true character.

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Massive Power with Stable Performance

Powered by the highly respected TI TPA3255 amplifier chip and NE5532 op-amps, the BT20A MAX delivers impressive power output suitable for bookshelf and floor-standing speakers alike.

• Max Output Power: 300W × 2 @ 4Ω

• RMS Output Power: 180W × 2 @ 4Ω

• Supports 2–8Ω speakers

An upgraded silent active cooling fan improves heat dissipation by up to 30% compared to the BT20A PRO, ensuring consistent high-power output without thermal stress — even during long listening sessions.

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Hi-Res Bluetooth 6.0 with Audiophile Codecs

At the heart of the BT20A MAX lies the Qualcomm QCC3095 Bluetooth chipset, delivering one of the most advanced wireless audio implementations in its class.

With Bluetooth 6.0, enjoy faster pairing, stronger signal stability, and ultra-low latency performance.

Supported Hi-Res Bluetooth codecs:

• LDAC

• aptX Lossless

• aptX Adaptive

• aptX HD

• aptX

• AAC

• SBC

Supports PCM up to 24-bit / 96kHz, allowing true high-resolution wireless playback — ideal for streaming music, TV audio, gaming, and everyday listening.

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Build a Powerful 2.1 Home Audio System

The BT20A MAX is more than a stereo amp — it’s a complete 2.1 audio control center.

Connectivity includes:

• Dual RCA inputs (RCA 1 / RCA 2)

• Dedicated subwoofer output

• Speaker output terminals

• Bluetooth input

This makes it perfect for:

• 2.1 home speaker systems

• Desktop HiFi setups

• TV + active subwoofer combinations

• Compact living room audio systems

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Smart Control & Listening Modes

Tailor your sound exactly the way you like:

• Tone Mode: Adjustable bass & treble control

• Bypass Mode: Pure, uncolored signal path

• HPF (High-Pass Filter): Optimizes speaker performance

• Motorized analog volume potentiometer

• IR remote control for effortless operation

• 12V Trigger Input for synchronized power on/off with other audio gear

Whether you prefer absolute neutrality or customized tuning, the BT20A MAX adapts to your listening style.

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Specifications

• Channels: 2.1

• Amplifier Chip: TI TPA3255

• Op-Amp: NE5532

• Max Output Power: 300W × 2 @ 4Ω

• RMS Output Power: 180W × 2 @ 4Ω

• Inputs: RCA 1 / RCA 2 / Bluetooth

• Outputs: Speaker Out / Subwoofer Out

• Signal-to-Noise Ratio: ≥ 112 dB

• THD+N: ≤ 0.003%

• Speaker Impedance: 2–8Ω

• Bluetooth SoC: Qualcomm QCC3095

• Bluetooth Version: 6.0

• Bluetooth Range: ≤ 15 meters (50 ft)

• Bluetooth Codecs: SBC, AAC, aptX, aptX HD, aptX Adaptive, aptX Lossless, LDAC

• Frequency Response: 20Hz – 20kHz (±0.5 dB)

• Power Input Voltage: DC 32V – 48V

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What’s in the Box

• Fosi Audio BT20A MAX Power Amplifier × 1

• Bluetooth Antenna × 1

• IR Remote Control × 1

• Power Adapter × 1

• User Manual × 1