The Fosi Audio V3 is a compact 2-channel Class D power amplifier built on the Texas Instruments TPA3255, rated up to 300W × 2 into 4Ω, with swappable NE5532 op-amps and a 48V/5A power adapter in the box. It suits desktop and bookshelf systems that need to drive passive 2–8Ω speakers from an RCA source.
Who the Fosi Audio V3 is for
Passive speakers on a desk: At 105mm wide, 35mm tall and 547g, the V3 fits on a desk or shelf and drives passive speakers rated 2–8Ω.
More output power: This bundle pairs the V3 with the 48V/5A adapter rather than Fosi's 32V/5A option, and higher supply voltage gives the amp more output power.
Power after a DAC or preamp: The stereo RCA input takes a DAC, CD player or preamp (a turntable needs a built-in or separate phono preamp); with a preamp in front, you can leave the V3 knob near 3 o'clock and set the level at the preamp.
Op-amp rolling: The two stock NE5532 op-amps swap out for 8-pin dual op-amps such as Sparkos SS3602, MUSES02 or OPA2134PA, which Fosi says lets you tailor the sound signature.
Adding a subwoofer: The 3.5mm pre-out can feed a powered subwoofer, active speakers or a second amplifier.
Skip it if: You need Bluetooth, a digital input or bass/treble controls; the V3 has one analog RCA input and a single power/volume knob, and RCA and speaker cables are not included.
Fosi Audio V3 key specs
Amplifier chip: Texas Instruments TPA3255, Class D, 2 channels
Max output power: 300W × 2 at 4Ω (Fosi maximum rating)
Speaker impedance: 2–8Ω
Inputs and outputs: Stereo RCA line in; L/R speaker terminals (banana plug or bare wire); 3.5mm pre-out
Finish: Black aluminum-alloy chassis; volume knob in black or orange, depending on the option
In the box: V3 amplifier, 48V/5A power adapter, user manual
Genuine Fosi Audio stock. Free shipping on every order, 45-day returns.
Fosi Audio V3 vs similar options
vs Fosi Audio BT20A Pro 48V: Adds Bluetooth input and bass/treble controls around the same TPA3255 chip and 48V supply; pick the V3 if your source is wired RCA and you want a simpler one-knob amp.
vs FiiO Level 1: Steps up to Bluetooth 6.0 with LDAC, USB-C and coaxial inputs and bass/treble controls, also on a TPA3255 with a 48V/5A adapter; pick the V3 for an RCA-only setup or speakers rated down to 2Ω.
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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