The Fosi Audio M03 leverages Texas Instruments TPA3255D2 architecture to deliver 200 watts of high-fidelity amplification—150W RMS at 4 ohms or 120W at 8 ohms. Dual-mode operation provides flexibility: engage PBTL mode for full-frequency mono amplification of passive speakers, or switch to SUB mode for dedicated subwoofer control with integrated 20-300Hz low-pass filtering and adjustable crossover frequency. The compact aluminum chassis houses efficient Class D circuitry optimized for transparent bass reproduction and minimal distortion. Ideal for audiophiles seeking versatile mono amplification in a space-conscious form factor. Note: Included 32V/5A power supply supports standard operation; upgrading to higher-capacity supply unlocks maximum power potential.