The Fosi Audio V3 is a compact, two-channel Class D stereo amplifier for driving passive speakers. It features a Texas Instruments TPA3255 amplifier chip, RCA line input, speaker outputs, and a 3.5 mm pre-out, all housed in a compact aluminum alloy chassis.
The V3 supports 2–8 ohm speakers, with a frequency response of 20 Hz–20 kHz (±0.1 dB), a signal-to-noise ratio of at least 110 dB, and THD below 0.003%. Thanks to its two replaceable NE5532 op-amps, the character of the analog stage can be customized.
Top and bottom ventilation openings, together with chip cooling coupled to the chassis, allow the entire enclosure to contribute to heat dissipation. The DC 24–48 V input range enables the use of different power supplies.