The Fosi Audio V3 Mono is a compact Class-D power amplifier built as a monoblock, one amp per channel, for desktop and small-room speaker systems. It suits hobbyists building budget hi-fi separates: two units, a preamp or DAC and passive speakers make a space-saving stereo setup.
Who the Fosi Audio V3 Mono is for
Budget separates builders: Two units, a preamp or DAC and passive speakers make a complete stereo separates chain that saves space.
Desks and small rooms: The compact footprint is designed for desktop and small-room speaker systems.
Channel-separation seekers: As a monoblock, each channel gets its own amplifier for true stereo separation.
Skip it if: you want one box that drives both speakers; the V3 Mono amplifies a single channel, so stereo takes two units.
Fosi Audio V3 Mono key specs
Amplifier type: Class-D power amplifier
Configuration: Mono (monoblock), one amp per channel
Stereo use: Two units, one per channel
Pairs with: Preamp or DAC, passive speakers
Color: Black
TonePier sells genuine, brand-new Fosi Audio stock only. Free US shipping is included, and our 45-day return policy lets you audition the V3 Mono in your own system.
Fosi Audio V3 Mono vs similar options
vs Fosi Audio BT20A Pro: A stereo TPA3255 Class D amp rated 300W x2 that drives both speakers from one box and costs less; choose two V3 Monos if you want a dedicated amp for each channel.
vs SMSL AO10: Runs a pair of passive speakers on its own, with a built-in Hi-Res DAC and Bluetooth; the V3 Mono needs a preamp or DAC in front and a second unit for stereo.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging with a valid serial number, and backed by our 1-year warranty and 45-day returns.
How long does shipping take?
Orders ship within 3 business days, with full tracking. Shipping to the US is free on every order, and most US orders arrive within 7–15 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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