Class D amps from $130 to $50,000—pulling more ears into hi-fi without demanding you sell a kidney. Solid tech, serious power, and none of the usual overpriced fluff. Finally, affordable doesn’t sound ...

Fosi Audio’s $229.99 BT20A MAX packs a TI TPA3255 amp, real 2.1 power, and unusually robust Bluetooth codec support—does it deliver where it counts? Fosi Audio has built a formidable presence in ...

Class D audio amplifiers with single-ended outputs can exhibit a strange behavior, in which the power-supply voltage increases with power delivered to the load. Called “power-supply pumping,” it can ...