Facmogu ST-838 2.1 Channel HiFi Subwoofer Amplifier — 80W Total, Compact Power for Home Audio

Overview

Meet the Facmogu ST-838, a compact 2.1 channel HiFi stereo amplifier that brings robust power to your home sound system. With RMS 20W per channel for the left and right drivers plus a 40W subwoofer channel, it delivers a balanced, dynamic performance that can drive most passive speakers and subwoofers. Despite its small footprint, the ST-838 aims for a clear, rich sound with low distortion, producing music and film scores with smooth highs and solid bass presence.

Power and sound shaping

The ST-838 offers main volume, bass and treble controls, plus a dedicated sub volume. This lets you tailor the tone and sub level to suit a casual afternoon playlist or a late night movie session without needing a full receiver. The RCA and 3.5 mm AUX inputs widen compatibility with phones, PCs, CD players, TVs, and more; a blue woofer alert lights up when the subwoofer is active, adding a subtle cue during playback.

Key capabilities

• 2.1 channel output 20W x 2 plus 40W subwoofer for solid, dynamic sound
• Independent sub volume and tone controls for flexible tuning
• RCA and 3.5 mm AUX inputs for broad device compatibility
• Blue woofer alert indicating sub activity

Ideal use scenarios

• Streaming music at home, gaming, or movies with richer bass
• Small spaces like bedrooms, kitchens, RVs, boats, or shelves
• Car and marine setups with appropriate speakers for on the go listening
• Value packed package including power adapter for quick setup

Compact design and what’s in the box

Measuring about 5.9 by 3.6 by 1.4 inches and weighing under 0.7 pounds, the ST-838 fits neatly on a shelf or in a vehicle dash while maintaining a modern matte black look. The kit includes a Facmogu DC 12V 3A adapter for fast setup. This amplifier is a practical upgrade for listeners seeking clearer sound without a large receiver, though results will vary by room and speakers.