The Fosi Audio M03 subwoofer amplifier is an affordable, compact and powerful little device. The TI TPA3255D2 amplifier chip delivers 2x 120Wrms power at 4 ohms.
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Fosi Audio M04 Subwoofer Amplifier for Home Theater Mono Channel Digital Class D Integrated Power Amp for Passive Speakers Subwoofer Rated 100W MAX : Electronics