staticV3
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This one is Stereo, so one would suffice:Would I need two of the Fosi V3s?

Fosi Audio V3 300W x2 2 Channel Hi-Fi Stereo Audio Amplifier
This compact yet powerful amplifier delivers a maximum power output of 600W into two channels, ensuring a captivating and high-fidelity sound experience.

This one is Mono, so you'd need one per speaker:

Fosi Audio V3 Mono Power Amplifier
Crafted for HiFi audiophiles, the V3 Mono allows you to drive a single passive speaker with one amp, delivering up to 240W @4Ω of rated power.

Both are called Fosi V3.