Low-Noise USB Stereo Amplifier Module

Size: 45 × 32 × 12 mm. Mass: ~15 g. Power input: 5V DC only, supplied via micro-USB or direct header connection. Output: stereo configuration delivering up to 3W per channel (6W total), or configurable for quad-channel operation using external jumpers. Core technology: PAM8403 Class-D amplifier IC combined with proprietary Digital Auditory Enhancement circuitry focused on noise floor reduction and spectral balance. PCB includes input coupling capacitors, RC filters on power rails, and ground plane segmentation to suppress digital interference. Delivers measured signal-to-noise ratio >85 dB (A-weighted), with ultra-low residual hiss even at maximum gain — critical for quiet environments like bedrooms, offices, or recording control rooms. Input sensitivity is matched to common DAC and codec outputs (e.g., Raspberry Pi HATs, ESP32-Audio boards), avoiding clipping or under-driving. Thermal design allows continuous operation at 70% output level without derating. Frequently used to replace underpowered built-in speakers in kiosks and digital signage, add local amplification to passive soundbars, drive compact horn-loaded speakers for wayfinding announcements, and support educational audio labs where repeatable, clean signal delivery matters more than peak power.