Fosi Audio V3: a 240W mono Class D power amplifier built on the TPA3255 with PFFB (post-filter feedback), in the version bundled with a 48V/5A power supply. It's meant for subwoofer duty and one-amp-per-channel home HiFi, whether you run two as a monoblock pair or one to drive a passive sub beside your stereo amp.
Who the Fosi Audio V3 is for
Monoblock builders: Buy two and give each channel its own amp instead of sharing a stereo chassis.
Passive subwoofer owners: A single V3 can drive a passive sub alongside the stereo amp you already run.
Buyers who want the supply in the box: The 48V/5A power supply is bundled, and the supply sets what the amp can actually deliver.
Skip it if: you want stereo from a single box; the V3 is one channel, so stereo takes two units.
Fosi Audio V3 key specs
Amplifier chip: TPA3255
Topology: Class D with PFFB (post-filter feedback)
Channels: mono
Output power: 240W
Power supply: 48V/5A (included)
Color: Black
Genuine Fosi Audio stock. Free shipping on every order, 45-day returns, 1-year warranty.
Fosi Audio V3 vs similar options
vs Fosi Audio BT20A Pro: Same TPA3255 chip as a stereo amp, rated 300W x2, with Bluetooth input and bass/treble controls; pick it for one-box stereo, the V3 for sub or monoblock duty.
vs SMSL PA40: SMSL's PA40 builds its power supply in, so there's no external brick, and adds tweeter adjustment and a remote; the V3 is the mono block for subwoofer or monoblock builds.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 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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