V1.0
amplifier
$70
Used market: $50*
Specifications
3 of 6 values have a recorded sourceExpert Audio Engineering Commentary
Headroom Notes
One of the few amplifiers at this price whose power figure comes with all three conditions named: 50 W x 2 into 4 ohms, 20 Hz - 20 kHz, 0.04 % THD. There is no 8-ohm figure, so for an 8-ohm speaker expect roughly half of it. TPA3116 with a 19 V / 4.74 A supply in the box; the supply, not the chip, is what sets the ceiling.
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.
«Model: V1.0B — Terminating Impedance 2Ω-8Ω»
Fosi sells this amplifier as two products, V1.0B and V1.0G, on separate pages with separate model rows in the specification table. Every electrical figure on the two pages is identical, including the 2 - 8 ohm load range and the 50 W x 2 rating; the difference is the finish.
checked 8/5/2026* Estimated with the depreciation fallback (~71% retained value). · checked on 8/5/2026