AudioChainsDB

Fosi AudioV3 Stereo Amp

amplifier

New retail price (MSRP)

$109

Used market: $80*

Check price at ThomannManufacturer datasheet

Specifications

1 of 5 values have a recorded source
Amp type
Integrated Stereo Amp·
Channels
2·
Speaker outputs
5-Way Binding Posts·
Minimum supported impedance
2✓
Indexable Locales
en·

Expert Audio Engineering Commentary

Tonal profile

Compact audiophile Class-D stereo amplifier powered by Texas Instruments TPA3255 chipset.

Thermal behavior

Handles 4 Ohm and 2 Ohm dip loads effortlessly without thermal shutoff due to full body aluminum heatsink chassis.

Amplification Warning

Fosi prints a maximum of 300 W × 2 into 4 Ω and a supply that cannot deliver that as continuous power. No continuous wattage is stored. The calculator reports the power as unknown. Terminating impedance 2–8 Ω is stored.

What the datasheet actually says

Quoted verbatim from the manufacturer’s own page, with the date we checked it. We state what is printed, not what anyone intended by it.

The maker’s own documents disagree
«Output Power: 300Wx2 @4Ω … Power Supply: 32V/5A, 48V/5A»

The same specification block states 300 W per channel into 4 ohms (600 W total) and a bundled power supply of 48 V / 5 A, which is 240 W of input power. The output figure exceeds what the supplied adapter can deliver, so it cannot be a continuous rating.

checked 8/6/2026

Setups using this gear

KEF LS50 Meta on a 109-dollar Fosi V3: safe where a 399-dollar receiver is notKEF LS50 Meta at 4 metres: how many watts does the room actually take?Speaker cable for the LS50 Meta: does 20 AWG instead of 12 AWG change anything?Klipsch RP-600M II on a Fosi V3: are 45 watts enough?Windows PC into a Fosi V3: is an external DAC worth it?Two pairs of speakers on one amplifier: what the parallel load really does

* Estimated with the depreciation fallback (~73% retained value).