This Affordable Amplifier is Perfect for Compact Stereo Systems

Give your old bookshelf speakers a new lease on life.

Hand holding a smartphone with a music app, pointed at a black audio amplifier with orange knob on a wooden shelf between white speakers.

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Published January 26, 2026

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Fosi Audio is an affordable hi-fi manufacturer that seems to be ever-growing in popularity and continues to churn out new gadgets. New to 2026, the company has revealed a compact integrated amplifier, the BT20A Max, for those looking repurpose a pair of passive bookshelf speakers.

According to the brand, the BT20A Max is “well suited for desktop audiophiles, apartment dwellers, and budget-conscious hi-fi enthusiasts seeking strong performance without the size or complexity of a traditional integrated amplifier.”

The Fosi BT20A Max is the “most advanced” amplifier in its BT20A series

Fosi Audio

A compact, maxed out amplifier

At its heart, the BT20A Max is an integrated amplifier designed to power a pair of passive bookshelf speakers. It has a built-in DAC, modern wired connections and support for Bluetooth streaming.

Fosi claims it is the “most advanced” amplifier in its BT20A series, which also consists of the BT20A ($80) and BT20A Pro ($100).

Black audio amplifier with orange volume knob on a wooden shelf next to a white speaker with an orange cone. — The BT20A Max promises to drive a wide range of passive bookshelf speakers.

That said, the BT20A Max has amplification capabilities similar to those of the BT20A Pro, which was released in 2023. Both have the same Texas Instruments TPA3255 amplifier chip and are capable of delivering 300 watts per channel (peak) or 180 watts into 4 ohms.

But Fosi has integrated its “Max” amplifier with PFFB (Post-Filter Feedback) technology, which it claims helps it achieve a “ultra-low distortion, high signal-to-noise ratio, and consistent performance across varying speaker loads.”

Black audio amplifier with orange volume knob and orange perforated side vents on a reflective surface. — The BT20A Max also supports up to a 2.1-channel system.

Higher resolution streaming

There are two other big differences with Fosi’s BT20A Max.

First, it can play higher resolution audio over Bluetooth. It has a more advanced Qualcomm QCC3095 chipset and supports the latest Bluetooth codecs — including aptX, aptX HD, aptX Adaptive, aptX Lossless and LDAC — and can stream audio up to 24-bit/96kHz.

Black and orange Fosi Audio amplifier with matching black remote control on a reflective black surface. — Compared to the other compact amplifiers in the series, the BT20A Max can stream higher-resolution audio over Bluetooth.

And second, it can support a 2.1-channel system — so you can add a subwoofer. The amplifier features dual RCA inputs, passive speaker terminals and a dedicated subwoofer output. Fosi claims this allows for “easy integration into compact stereo or desktop setups.”

The amplifier features a selectable high-pass filter at 80 Hz that, according to the brand, improves vocal clarity when paired with a subwoofer. It also has controls for adjusting bass and treble, so listeners to fine-tune their audio or preserve the original signal path.

Price and availability

The Fosi Audio BT20A Max is available now through the company’s official website. It costs $230.

Black and gray Fosi Audio BT20A MAX amplifier with orange volume knob and side ventilation holes.

Fosi BT20A Max

$230 at Fosi

About the Author: Tucker Bowe has been on Gear Patrol’s editorial team since 2014. With a passion for consumer tech and hi-fi, he tracks everything from headphones and turntables to smartphones and wearables. If it lights up or makes noise, he probably covers it.

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